120 MHz daughterboard support, Integer-N tuning, ADF435x code consolidation

* Added support for new CBX-120, SBX-120, and WBX-120 daughterboards
* Added implementation of Integer-N tuning for all CBX, SBX, and WBX daughterboards
* Added --int-n option to examples to show how to use Integer-N tuning API
* Removed duplicate ADF4350/ADF4351 code and moved it to common/adf435x_common.cpp

11 files changed, 363 insertions, 658 deletions

diff --git a/host/lib/usrp/dboard/db_cbx.cpp b/host/lib/usrp/dboard/db_cbx.cpp
index 04399e64e..ae41a7971 100644
--- a/host/lib/usrp/dboard/db_cbx.cpp
+++ b/host/lib/usrp/dboard/db_cbx.cpp
@@ -1,5 +1,5 @@
 //
-// Copyright 2011-2012 Ettus Research LLC
+// Copyright 2011-2014 Ettus Research LLC
 //
 // This program is free software: you can redistribute it and/or modify
 // it under the terms of the GNU General Public License as published by
@@ -46,6 +46,16 @@ double sbx_xcvr::cbx::set_lo_freq(dboard_iface::unit_t unit, double target_freq)
         "CBX tune: target frequency %f Mhz"
     ) % (target_freq/1e6) << std::endl;
 
+    /*
+     * If the user sets 'mode_n=int-n' in the tuning args, the user wishes to
+     * tune in Integer-N mode, which can result in better spur
+     * performance on some mixers. The default is fractional tuning.
+     */
+    property_tree::sptr subtree = (unit == dboard_iface::UNIT_RX) ? self_base->get_rx_subtree()
+                                                                  : self_base->get_tx_subtree();
+    device_addr_t tune_args = subtree->access<device_addr_t>("tune_args").get();
+    bool is_int_n = (tune_args.get("mode_n","") == "int-n");
+
     //clip the input
     target_freq = cbx_freq_range.clip(target_freq);
 
@@ -64,14 +74,13 @@ double sbx_xcvr::cbx::set_lo_freq(dboard_iface::unit_t unit, double target_freq)
         (64,  max2870_regs_t::RF_DIVIDER_SELECT_DIV64)
         (128, max2870_regs_t::RF_DIVIDER_SELECT_DIV128)
     ;
-    
+
     double actual_freq, pfd_freq;
     double ref_freq = self_base->get_iface()->get_clock_rate(unit);
-    max2870_regs_t::int_n_mode_t int_n_mode;
     int R=0, BS=0, N=0, FRAC=0, MOD=4095;
     int RFdiv = 1;
     max2870_regs_t::reference_divide_by_2_t T     = max2870_regs_t::REFERENCE_DIVIDE_BY_2_DISABLED;
-    max2870_regs_t::reference_doubler_t     D     = max2870_regs_t::REFERENCE_DOUBLER_DISABLED;    
+    max2870_regs_t::reference_doubler_t     D     = max2870_regs_t::REFERENCE_DOUBLER_DISABLED;
 
     //Reference doubler for 50% duty cycle
     // if ref_freq < 12.5MHz enable regs.reference_divide_by_2
@@ -115,11 +124,15 @@ double sbx_xcvr::cbx::set_lo_freq(dboard_iface::unit_t unit, double target_freq)
         //Fractional-N calculation
         FRAC = int((vco_freq/pfd_freq - N)*MOD);
 
-        //are we in int-N or frac-N mode?
-        int_n_mode = (FRAC == 0) ? max2870_regs_t::INT_N_MODE_INT_N : max2870_regs_t::INT_N_MODE_FRAC_N;
+        if(is_int_n) {
+            if (FRAC > (MOD / 2)) { //Round integer such that actual freq is closest to target
+                N++;
+            }
+            FRAC = 0;
+        }
 
         //keep N within int divider requirements
-        if(int_n_mode == max2870_regs_t::INT_N_MODE_INT_N) {
+        if(is_int_n) {
             if(N < int_n_mode_div_range.start()) continue;
             if(N > int_n_mode_div_range.stop()) continue;
         } else {
@@ -144,17 +157,20 @@ double sbx_xcvr::cbx::set_lo_freq(dboard_iface::unit_t unit, double target_freq)
     //actual frequency calculation
     actual_freq = double((N + (double(FRAC)/double(MOD)))*ref_freq*(1+int(D))/(R*(1+int(T)))/RFdiv);
 
+    boost::uint16_t rx_id = self_base->get_rx_id().to_uint16();
+    std::string board_name = (rx_id == 0x0085) ? "CBX-120" : "CBX";
     UHD_LOGV(often)
-        << boost::format("CBX Intermediates: ref=%0.2f, outdiv=%f, fbdiv=%f") % (ref_freq*(1+int(D))/(R*(1+int(T)))) % double(RFdiv*2) % double(N + double(FRAC)/double(MOD)) << std::endl
-        << boost::format("CBX tune: R=%d, BS=%d, N=%d, FRAC=%d, MOD=%d, T=%d, D=%d, RFdiv=%d"
-            ) % R % BS % N % FRAC % MOD % T % D % RFdiv << std::endl
-        << boost::format("CBX Frequencies (MHz): REQ=%0.2f, ACT=%0.2f, VCO=%0.2f, PFD=%0.2f, BAND=%0.2f"
-            ) % (target_freq/1e6) % (actual_freq/1e6) % (vco_freq/1e6) % (pfd_freq/1e6) % (pfd_freq/BS/1e6) << std::endl;
+        << boost::format("%s Intermediates: ref=%0.2f, outdiv=%f, fbdiv=%f"
+            ) % board_name.c_str() % (ref_freq*(1+int(D))/(R*(1+int(T)))) % double(RFdiv*2) % double(N + double(FRAC)/double(MOD)) << std::endl
+        << boost::format("%s tune: R=%d, BS=%d, N=%d, FRAC=%d, MOD=%d, T=%d, D=%d, RFdiv=%d, type=%s"
+            ) % board_name.c_str() % R % BS % N % FRAC % MOD % T % D % RFdiv % ((is_int_n) ? "Integer-N" : "Fractional") << std::endl
+        << boost::format("%s Frequencies (MHz): REQ=%0.2f, ACT=%0.2f, VCO=%0.2f, PFD=%0.2f, BAND=%0.2f"
+            ) % board_name.c_str() % (target_freq/1e6) % (actual_freq/1e6) % (vco_freq/1e6) % (pfd_freq/1e6) % (pfd_freq/BS/1e6) << std::endl;
 
     //load the register values
     max2870_regs_t regs;
 
-    if ((unit == dboard_iface::UNIT_TX) and (actual_freq == sbx_tx_lo_2dbm.clip(actual_freq))) 
+    if ((unit == dboard_iface::UNIT_TX) and (actual_freq == sbx_tx_lo_2dbm.clip(actual_freq)))
         regs.output_power = max2870_regs_t::OUTPUT_POWER_2DBM;
     else
         regs.output_power = max2870_regs_t::OUTPUT_POWER_5DBM;
@@ -163,7 +179,7 @@ double sbx_xcvr::cbx::set_lo_freq(dboard_iface::unit_t unit, double target_freq)
     max2870_regs_t::cpl_t cpl;
     max2870_regs_t::ldf_t ldf;
     max2870_regs_t::cpoc_t cpoc;
-    if(int_n_mode == max2870_regs_t::INT_N_MODE_INT_N) {
+    if(is_int_n) {
         cpl = max2870_regs_t::CPL_DISABLED;
         cpoc = max2870_regs_t::CPOC_ENABLED;
         ldf = max2870_regs_t::LDF_INT_N;
@@ -184,10 +200,10 @@ double sbx_xcvr::cbx::set_lo_freq(dboard_iface::unit_t unit, double target_freq)
     regs.band_select_clock_div = BS;
     UHD_ASSERT_THROW(rfdivsel_to_enum.has_key(RFdiv));
     regs.rf_divider_select = rfdivsel_to_enum[RFdiv];
-    regs.int_n_mode = int_n_mode;
+    regs.int_n_mode = (is_int_n) ? max2870_regs_t::INT_N_MODE_INT_N : max2870_regs_t::INT_N_MODE_FRAC_N;
     regs.cpl = cpl;
     regs.ldf = ldf;
-    regs.cpoc = cpoc;    
+    regs.cpoc = cpoc;
 
     //write the registers
     //correct power-up sequence to write registers (5, 4, 3, 2, 1, 0)
@@ -195,8 +211,8 @@ double sbx_xcvr::cbx::set_lo_freq(dboard_iface::unit_t unit, double target_freq)
 
     for(addr=5; addr>=0; addr--){
         UHD_LOGV(often) << boost::format(
-            "CBX SPI Reg (0x%02x): 0x%08x"
-        ) % addr % regs.get_reg(addr) << std::endl;
+            "%s SPI Reg (0x%02x): 0x%08x"
+        ) % board_name.c_str() % addr % regs.get_reg(addr) << std::endl;
         self_base->get_iface()->write_spi(
             unit, spi_config_t::EDGE_RISE,
             regs.get_reg(addr), 32
@@ -205,8 +221,8 @@ double sbx_xcvr::cbx::set_lo_freq(dboard_iface::unit_t unit, double target_freq)
 
     //return the actual frequency
     UHD_LOGV(often) << boost::format(
-        "CBX tune: actual frequency %f Mhz"
-    ) % (actual_freq/1e6) << std::endl;
+        "%s tune: actual frequency %f Mhz"
+    ) % board_name.c_str() % (actual_freq/1e6) << std::endl;
     return actual_freq;
 }
 
diff --git a/host/lib/usrp/dboard/db_sbx_common.cpp b/host/lib/usrp/dboard/db_sbx_common.cpp
index 5b713c6d7..49e30949e 100644
--- a/host/lib/usrp/dboard/db_sbx_common.cpp
+++ b/host/lib/usrp/dboard/db_sbx_common.cpp
@@ -1,5 +1,5 @@
 //
-// Copyright 2011-2012 Ettus Research LLC
+// Copyright 2011-2014 Ettus Research LLC
 //
 // This program is free software: you can redistribute it and/or modify
 // it under the terms of the GNU General Public License as published by
@@ -21,137 +21,6 @@ using namespace uhd;
 using namespace uhd::usrp;
 using namespace boost::assign;
 
-/***********************************************************************
- * ADF 4350/4351 Tuning Utility
- **********************************************************************/
-sbx_xcvr::sbx_versionx::adf435x_tuning_settings sbx_xcvr::sbx_versionx::_tune_adf435x_synth(
-    double target_freq,
-    double ref_freq,
-    const adf435x_tuning_constraints& constraints,
-    double& actual_freq)
-{
-    //Default invalid value for actual_freq
-    actual_freq = 0;
-
-    double pfd_freq = 0;
-    boost::uint16_t R = 0, BS = 0, N = 0, FRAC = 0, MOD = 0;
-    boost::uint16_t RFdiv = static_cast<boost::uint16_t>(constraints.rf_divider_range.start());
-    bool D = false, T = false;
-
-    //Reference doubler for 50% duty cycle
-    //If ref_freq < 12.5MHz enable the reference doubler
-    D = (ref_freq <= constraints.ref_doubler_threshold);
-
-    static const double MIN_VCO_FREQ = 2.2e9;
-    static const double MAX_VCO_FREQ = 4.4e9;
-
-    //increase RF divider until acceptable VCO frequency
-    double vco_freq = target_freq;
-    while (vco_freq < MIN_VCO_FREQ && RFdiv < static_cast<boost::uint16_t>(constraints.rf_divider_range.stop())) {
-        vco_freq *= 2;
-        RFdiv *= 2;
-    }
-
-    /*
-     * The goal here is to loop though possible R dividers,
-     * band select clock dividers, N (int) dividers, and FRAC
-     * (frac) dividers.
-     *
-     * Calculate the N and F dividers for each set of values.
-     * The loop exits when it meets all of the constraints.
-     * The resulting loop values are loaded into the registers.
-     *
-     * from pg.21
-     *
-     * f_pfd = f_ref*(1+D)/(R*(1+T))
-     * f_vco = (N + (FRAC/MOD))*f_pfd
-     *    N = f_vco/f_pfd - FRAC/MOD = f_vco*((R*(T+1))/(f_ref*(1+D))) - FRAC/MOD
-     * f_rf = f_vco/RFdiv)
-     * f_actual = f_rf/2
-     */
-    for(R = 1; R <= 1023; R+=1){
-        //PFD input frequency = f_ref/R ... ignoring Reference doubler/divide-by-2 (D & T)
-        pfd_freq = ref_freq*(D?2:1)/(R*(T?2:1));
-
-        //keep the PFD frequency at or below 25MHz (Loop Filter Bandwidth)
-        if (pfd_freq > constraints.pfd_freq_max) continue;
-
-        //ignore fractional part of tuning
-        //N is computed from target_freq and not vco_freq because the feedback
-        //mode is set to FEEDBACK_SELECT_DIVIDED
-        N = boost::uint16_t(std::floor(target_freq/pfd_freq));
-
-        //keep N > minimum int divider requirement
-        if (N < static_cast<boost::uint16_t>(constraints.int_range.start())) continue;
-
-        for(BS=1; BS <= 255; BS+=1){
-            //keep the band select frequency at or below band_sel_freq_max
-            //constraint on band select clock
-            if (pfd_freq/BS > constraints.band_sel_freq_max) continue;
-            goto done_loop;
-        }
-    } done_loop:
-
-    //Fractional-N calculation
-    MOD = 4095; //max fractional accuracy
-    //N is computed from target_freq and not vco_freq because the feedback
-    //mode is set to FEEDBACK_SELECT_DIVIDED
-    FRAC = static_cast<boost::uint16_t>((target_freq/pfd_freq - N)*MOD);
-    if (constraints.force_frac0) {
-        if (FRAC > (MOD / 2)) { //Round integer such that actual freq is closest to target
-            N++;
-        }
-        FRAC = 0;
-    }
-
-    //Reference divide-by-2 for 50% duty cycle
-    // if R even, move one divide by 2 to to regs.reference_divide_by_2
-    if(R % 2 == 0) {
-        T = true;
-        R /= 2;
-    }
-
-    //Typical phase resync time documented in data sheet pg.24
-    static const double PHASE_RESYNC_TIME = 400e-6;
-
-    //actual frequency calculation
-    actual_freq = double((N + (double(FRAC)/double(MOD)))*ref_freq*(D?2:1)/(R*(T?2:1)));
-
-    //load the settings
-    adf435x_tuning_settings settings;
-    settings.frac_12_bit = FRAC;
-    settings.int_16_bit = N;
-    settings.mod_12_bit = MOD;
-    settings.clock_divider_12_bit = std::max<boost::uint16_t>(1, std::ceil(PHASE_RESYNC_TIME*pfd_freq/MOD));
-    settings.r_counter_10_bit = R;
-    settings.r_divide_by_2_en = T;
-    settings.r_doubler_en = D;
-    settings.band_select_clock_div = BS;
-    settings.rf_divider = RFdiv;
-    settings.feedback_after_divider = true;
-
-    UHD_LOGV(often)
-        << boost::format("ADF 435X Frequencies (MHz): REQUESTED=%0.9f, ACTUAL=%0.9f"
-        ) % (target_freq/1e6) % (actual_freq/1e6) << std::endl
-        << boost::format("ADF 435X Intermediates (MHz): VCO=%0.2f, PFD=%0.2f, BAND=%0.2f, REF=%0.2f"
-        ) % (vco_freq/1e6) % (pfd_freq/1e6) % (pfd_freq/BS/1e6) % (ref_freq/1e6) << std::endl
-        << boost::format("ADF 435X Settings: R=%d, BS=%d, N=%d, FRAC=%d, MOD=%d, T=%d, D=%d, RFdiv=%d"
-        ) % R % BS % N % FRAC % MOD % T % D % RFdiv << std::endl;
-
-    UHD_ASSERT_THROW((settings.frac_12_bit          & ((boost::uint16_t)~0xFFF)) == 0);
-    UHD_ASSERT_THROW((settings.mod_12_bit           & ((boost::uint16_t)~0xFFF)) == 0);
-    UHD_ASSERT_THROW((settings.clock_divider_12_bit & ((boost::uint16_t)~0xFFF)) == 0);
-    UHD_ASSERT_THROW((settings.r_counter_10_bit     & ((boost::uint16_t)~0x3FF)) == 0);
-
-    UHD_ASSERT_THROW(vco_freq >= MIN_VCO_FREQ and vco_freq <= MAX_VCO_FREQ);
-    UHD_ASSERT_THROW(settings.rf_divider >= static_cast<boost::uint16_t>(constraints.rf_divider_range.start()));
-    UHD_ASSERT_THROW(settings.rf_divider <= static_cast<boost::uint16_t>(constraints.rf_divider_range.stop()));
-    UHD_ASSERT_THROW(settings.int_16_bit >= static_cast<boost::uint16_t>(constraints.int_range.start()));
-    UHD_ASSERT_THROW(settings.int_16_bit <= static_cast<boost::uint16_t>(constraints.int_range.stop()));
-
-    return settings;
-}
-
 
 /***********************************************************************
  * Register the SBX dboard (min freq, max freq, rx div2, tx div2)
@@ -164,6 +33,8 @@ UHD_STATIC_BLOCK(reg_sbx_dboards){
     dboard_manager::register_dboard(0x0054, 0x0055, &make_sbx, "SBX");
     dboard_manager::register_dboard(0x0065, 0x0064, &make_sbx, "SBX v4");
     dboard_manager::register_dboard(0x0067, 0x0066, &make_sbx, "CBX");
+    dboard_manager::register_dboard(0x0083, 0x0082, &make_sbx, "SBX-120");
+    dboard_manager::register_dboard(0x0085, 0x0084, &make_sbx, "CBX-120");
 }
 
 
@@ -244,15 +115,23 @@ double sbx_xcvr::set_rx_gain(double gain, const std::string &name){
  **********************************************************************/
 sbx_xcvr::sbx_xcvr(ctor_args_t args) : xcvr_dboard_base(args){
     switch(get_rx_id().to_uint16()) {
-        case 0x054:
+        case 0x0054:
             db_actual = sbx_versionx_sptr(new sbx_version3(this));
             freq_range = sbx_freq_range;
             break;
-        case 0x065:
+        case 0x0065:
             db_actual = sbx_versionx_sptr(new sbx_version4(this));
             freq_range = sbx_freq_range;
             break;
-        case 0x067:
+        case 0x0067:
+            db_actual = sbx_versionx_sptr(new cbx(this));
+            freq_range = cbx_freq_range;
+            break;
+        case 0x0083:
+            db_actual = sbx_versionx_sptr(new sbx_version4(this));
+            freq_range = sbx_freq_range;
+            break;
+        case 0x0085:
             db_actual = sbx_versionx_sptr(new cbx(this));
             freq_range = cbx_freq_range;
             break;
@@ -264,9 +143,14 @@ sbx_xcvr::sbx_xcvr(ctor_args_t args) : xcvr_dboard_base(args){
     ////////////////////////////////////////////////////////////////////
     // Register RX properties
     ////////////////////////////////////////////////////////////////////
-    if(get_rx_id() == 0x054) this->get_rx_subtree()->create<std::string>("name").set("SBXv3 RX");
-    else if(get_rx_id() == 0x065) this->get_rx_subtree()->create<std::string>("name").set("SBXv4 RX");
-    else if(get_rx_id() == 0x067) this->get_rx_subtree()->create<std::string>("name").set("CBX RX");
+    this->get_rx_subtree()->create<device_addr_t>("tune_args").set(device_addr_t());
+
+    boost::uint16_t rx_id = get_rx_id().to_uint16();
+    if(rx_id == 0x0054) this->get_rx_subtree()->create<std::string>("name").set("SBXv3 RX");
+    else if(rx_id == 0x0065) this->get_rx_subtree()->create<std::string>("name").set("SBXv4 RX");
+    else if(rx_id == 0x0067) this->get_rx_subtree()->create<std::string>("name").set("CBX RX");
+    else if(rx_id == 0x0083) this->get_rx_subtree()->create<std::string>("name").set("SBX-120 RX");
+    else if(rx_id == 0x0085) this->get_rx_subtree()->create<std::string>("name").set("CBX-120 RX");
     else this->get_rx_subtree()->create<std::string>("name").set("SBX/CBX RX");
 
     this->get_rx_subtree()->create<sensor_value_t>("sensors/lo_locked")
@@ -290,16 +174,24 @@ sbx_xcvr::sbx_xcvr(ctor_args_t args) : xcvr_dboard_base(args){
     this->get_rx_subtree()->create<std::string>("connection").set("IQ");
     this->get_rx_subtree()->create<bool>("enabled").set(true); //always enabled
     this->get_rx_subtree()->create<bool>("use_lo_offset").set(false);
-    this->get_rx_subtree()->create<double>("bandwidth/value").set(2*20.0e6); //20MHz low-pass, we want complex double-sided
+
+    //Value of bw low-pass dependent on board, we want complex double-sided
+    double rx_bw = ((rx_id != 0x0083) && (rx_id != 0x0085)) ? 20.0e6 : 60.0e6;
+    this->get_rx_subtree()->create<double>("bandwidth/value").set(2*rx_bw);
     this->get_rx_subtree()->create<meta_range_t>("bandwidth/range")
-        .set(freq_range_t(2*20.0e6, 2*20.0e6));
+        .set(freq_range_t(2*rx_bw, 2*rx_bw));
 
     ////////////////////////////////////////////////////////////////////
     // Register TX properties
     ////////////////////////////////////////////////////////////////////
-    if(get_tx_id() == 0x055) this->get_tx_subtree()->create<std::string>("name").set("SBXv3 TX");
-    else if(get_tx_id() == 0x064) this->get_tx_subtree()->create<std::string>("name").set("SBXv4 TX");
-    else if(get_tx_id() == 0x066) this->get_tx_subtree()->create<std::string>("name").set("CBX TX");
+    this->get_tx_subtree()->create<device_addr_t>("tune_args").set(device_addr_t());
+
+    boost::uint16_t tx_id = get_tx_id().to_uint16();
+    if(tx_id == 0x0055) this->get_tx_subtree()->create<std::string>("name").set("SBXv3 TX");
+    else if(tx_id == 0x0064) this->get_tx_subtree()->create<std::string>("name").set("SBXv4 TX");
+    else if(tx_id == 0x0066) this->get_tx_subtree()->create<std::string>("name").set("CBX TX");
+    else if(tx_id == 0x0082) this->get_tx_subtree()->create<std::string>("name").set("SBX-120 TX");
+    else if(tx_id == 0x0084) this->get_tx_subtree()->create<std::string>("name").set("CBX-120 TX");
     else this->get_tx_subtree()->create<std::string>("name").set("SBX/CBX TX");
 
     this->get_tx_subtree()->create<sensor_value_t>("sensors/lo_locked")
@@ -323,9 +215,12 @@ sbx_xcvr::sbx_xcvr(ctor_args_t args) : xcvr_dboard_base(args){
     this->get_tx_subtree()->create<std::string>("connection").set("QI");
     this->get_tx_subtree()->create<bool>("enabled").set(true); //always enabled
     this->get_tx_subtree()->create<bool>("use_lo_offset").set(false);
-    this->get_tx_subtree()->create<double>("bandwidth/value").set(2*20.0e6); //20MHz low-pass, we want complex double-sided
+
+    //Value of bw low-pass dependent on board, we want complex double-sided
+    double tx_bw = ((tx_id != 0x0082) && (tx_id != 0x0084)) ? 20.0e6 : 60.0e6;
+    this->get_tx_subtree()->create<double>("bandwidth/value").set(2*tx_bw);
     this->get_tx_subtree()->create<meta_range_t>("bandwidth/range")
-        .set(freq_range_t(2*20.0e6, 2*20.0e6));
+        .set(freq_range_t(2*tx_bw, 2*tx_bw));
 
     //enable the clocks that we need
     this->get_iface()->set_clock_enabled(dboard_iface::UNIT_TX, true);
@@ -493,3 +388,4 @@ void sbx_xcvr::flash_leds(void) {
     this->get_iface()->set_gpio_ddr(dboard_iface::UNIT_TX, (TXIO_MASK|TX_LED_IO));
     this->get_iface()->set_gpio_ddr(dboard_iface::UNIT_RX, (RXIO_MASK|RX_LED_IO));
 }
+
diff --git a/host/lib/usrp/dboard/db_sbx_common.hpp b/host/lib/usrp/dboard/db_sbx_common.hpp
index e9bb2434c..a4bbfde38 100644
--- a/host/lib/usrp/dboard/db_sbx_common.hpp
+++ b/host/lib/usrp/dboard/db_sbx_common.hpp
@@ -1,5 +1,5 @@
 //
-// Copyright 2011-2012 Ettus Research LLC
+// Copyright 2011-2013 Ettus Research LLC
 //
 // This program is free software: you can redistribute it and/or modify
 // it under the terms of the GNU General Public License as published by
@@ -15,14 +15,12 @@
 // along with this program.  If not, see <http://www.gnu.org/licenses/>.
 //
 
+#include <uhd/types/device_addr.hpp>
 
+#include "../common/adf435x_common.hpp"
 
 // Common IO Pins
 #define LO_LPF_EN       (1 << 15)
-#define SYNTH_CE        (1 << 3)
-#define SYNTH_PDBRF     (1 << 2)
-#define SYNTH_MUXOUT    (1 << 1)                // INPUT!!!
-#define LOCKDET_MASK    (1 << 0)                // INPUT!!!
 
 // TX IO Pins
 #define TRSW            (1 << 14)               // 0 = TX, 1 = RX
@@ -38,33 +36,29 @@
 #define DIS_POWER_RX    (1 << 5)                // on UNIT_RX, 0 powers up RX
 #define RX_DISABLE      (1 << 4)                // on UNIT_RX, 1 disables RX Mixer and Baseband
 
-// RX Attenuator Pins
-#define RX_ATTN_SHIFT   8                       // lsb of RX Attenuator Control
-#define RX_ATTN_MASK    (63 << RX_ATTN_SHIFT)   // valid bits of RX Attenuator Control
-
 // TX Attenuator Pins
 #define TX_ATTN_SHIFT   8                       // lsb of TX Attenuator Control
 #define TX_ATTN_MASK    (63 << TX_ATTN_SHIFT)   // valid bits of TX Attenuator Control
 
 // Mixer functions
-#define TX_MIXER_ENB    (SYNTH_PDBRF|TX_ENABLE)
+#define TX_MIXER_ENB    (ADF435X_PDBRF|TX_ENABLE)
 #define TX_MIXER_DIS    0
 
-#define RX_MIXER_ENB    (SYNTH_PDBRF)
+#define RX_MIXER_ENB    (ADF435X_PDBRF)
 #define RX_MIXER_DIS    0
 
 // Pin functions
 #define TX_LED_IO       (TX_LED_TXRX|TX_LED_LD)     // LED gpio lines, pull down for LED
-#define TXIO_MASK       (LO_LPF_EN|TRSW|SYNTH_CE|SYNTH_PDBRF|TX_ATTN_MASK|DIS_POWER_TX|TX_ENABLE)
+#define TXIO_MASK       (LO_LPF_EN|TRSW|ADF435X_CE|ADF435X_PDBRF|TX_ATTN_MASK|DIS_POWER_TX|TX_ENABLE)
 
 #define RX_LED_IO       (RX_LED_RX1RX2|RX_LED_LD)   // LED gpio lines, pull down for LED
-#define RXIO_MASK       (LO_LPF_EN|LNASW|SYNTH_CE|SYNTH_PDBRF|RX_ATTN_MASK|DIS_POWER_RX|RX_DISABLE)
+#define RXIO_MASK       (LO_LPF_EN|LNASW|ADF435X_CE|ADF435X_PDBRF|RX_ATTN_MASK|DIS_POWER_RX|RX_DISABLE)
 
 // Power functions
-#define TX_POWER_UP     (SYNTH_CE)
+#define TX_POWER_UP     (ADF435X_CE)
 #define TX_POWER_DOWN   (DIS_POWER_TX)
 
-#define RX_POWER_UP     (SYNTH_CE)
+#define RX_POWER_UP     (ADF435X_CE)
 #define RX_POWER_DOWN   (DIS_POWER_RX)
 
 // Antenna constants
@@ -181,34 +175,6 @@ protected:
         ~sbx_versionx(void) {}
 
         virtual double set_lo_freq(dboard_iface::unit_t unit, double target_freq) = 0;
-    protected:
-        struct adf435x_tuning_constraints {
-            bool            force_frac0;
-            double          ref_doubler_threshold;
-            double          pfd_freq_max;
-            double          band_sel_freq_max;
-            uhd::range_t    rf_divider_range;
-            uhd::range_t    int_range;
-        };
-
-        struct adf435x_tuning_settings {
-            boost::uint16_t frac_12_bit;
-            boost::uint16_t int_16_bit;
-            boost::uint16_t mod_12_bit;
-            boost::uint16_t r_counter_10_bit;
-            bool            r_doubler_en;
-            bool            r_divide_by_2_en;
-            boost::uint16_t clock_divider_12_bit;
-            boost::uint8_t  band_select_clock_div;
-            boost::uint16_t rf_divider;
-            bool            feedback_after_divider;
-        };
-
-        adf435x_tuning_settings _tune_adf435x_synth(
-            double target_freq,
-            double ref_freq,
-            const adf435x_tuning_constraints& constraints,
-            double& actual_freq);
     };
 
     /*!
diff --git a/host/lib/usrp/dboard/db_sbx_version3.cpp b/host/lib/usrp/dboard/db_sbx_version3.cpp
index b0c9cd18f..ef0126557 100644
--- a/host/lib/usrp/dboard/db_sbx_version3.cpp
+++ b/host/lib/usrp/dboard/db_sbx_version3.cpp
@@ -1,5 +1,5 @@
 //
-// Copyright 2011-2012 Ettus Research LLC
+// Copyright 2011-2014 Ettus Research LLC
 //
 // This program is free software: you can redistribute it and/or modify
 // it under the terms of the GNU General Public License as published by
@@ -18,7 +18,8 @@
 
 #include "adf4350_regs.hpp"
 #include "db_sbx_common.hpp"
-
+#include "../common/adf435x_common.hpp"
+#include <uhd/types/tune_request.hpp>
 
 using namespace uhd;
 using namespace uhd::usrp;
@@ -45,6 +46,16 @@ double sbx_xcvr::sbx_version3::set_lo_freq(dboard_iface::unit_t unit, double tar
         "SBX tune: target frequency %f Mhz"
     ) % (target_freq/1e6) << std::endl;
 
+    /*
+     * If the user sets 'mode_n=int-n' in the tuning args, the user wishes to
+     * tune in Integer-N mode, which can result in better spur
+     * performance on some mixers. The default is fractional tuning.
+     */
+    property_tree::sptr subtree = (unit == dboard_iface::UNIT_RX) ? self_base->get_rx_subtree()
+                                                                  : self_base->get_tx_subtree();
+    device_addr_t tune_args = subtree->access<device_addr_t>("tune_args").get();
+    bool is_int_n = (tune_args.get("mode_n","") == "int-n");
+
     //clip the input
     target_freq = sbx_freq_range.clip(target_freq);
 
@@ -67,7 +78,7 @@ double sbx_xcvr::sbx_version3::set_lo_freq(dboard_iface::unit_t unit, double tar
     adf4350_regs_t::prescaler_t prescaler = target_freq > 3e9 ? adf4350_regs_t::PRESCALER_8_9 : adf4350_regs_t::PRESCALER_4_5;
 
     adf435x_tuning_constraints tuning_constraints;
-    tuning_constraints.force_frac0 = false;
+    tuning_constraints.force_frac0 = is_int_n;
     tuning_constraints.band_sel_freq_max = 100e3;
     tuning_constraints.ref_doubler_threshold = 12.5e6;
     tuning_constraints.int_range = uhd::range_t(prescaler_to_min_int_div[prescaler], 4095);  //INT is a 12-bit field
@@ -75,7 +86,7 @@ double sbx_xcvr::sbx_version3::set_lo_freq(dboard_iface::unit_t unit, double tar
     tuning_constraints.rf_divider_range = uhd::range_t(1, 16);
 
     double actual_freq;
-    adf435x_tuning_settings tuning_settings = _tune_adf435x_synth(
+    adf435x_tuning_settings tuning_settings = tune_adf435x_synth(
         target_freq, self_base->get_iface()->get_clock_rate(unit),
         tuning_constraints, actual_freq);
 
@@ -106,6 +117,9 @@ double sbx_xcvr::sbx_version3::set_lo_freq(dboard_iface::unit_t unit, double tar
     regs.band_select_clock_div  = tuning_settings.band_select_clock_div;
     UHD_ASSERT_THROW(rfdivsel_to_enum.has_key(tuning_settings.rf_divider));
     regs.rf_divider_select      = rfdivsel_to_enum[tuning_settings.rf_divider];
+    regs.ldf                    = is_int_n ?
+                                    adf4350_regs_t::LDF_INT_N :
+                                    adf4350_regs_t::LDF_FRAC_N;
 
     //reset the N and R counter
     regs.counter_reset = adf4350_regs_t::COUNTER_RESET_ENABLED;
diff --git a/host/lib/usrp/dboard/db_sbx_version4.cpp b/host/lib/usrp/dboard/db_sbx_version4.cpp
index 8d95b0655..6c0cebb4b 100644
--- a/host/lib/usrp/dboard/db_sbx_version4.cpp
+++ b/host/lib/usrp/dboard/db_sbx_version4.cpp
@@ -1,5 +1,5 @@
 //
-// Copyright 2011-2012 Ettus Research LLC
+// Copyright 2011-2014 Ettus Research LLC
 //
 // This program is free software: you can redistribute it and/or modify
 // it under the terms of the GNU General Public License as published by
@@ -18,7 +18,8 @@
 
 #include "adf4351_regs.hpp"
 #include "db_sbx_common.hpp"
-
+#include "../common/adf435x_common.hpp"
+#include <uhd/types/tune_request.hpp>
 
 using namespace uhd;
 using namespace uhd::usrp;
@@ -46,6 +47,16 @@ double sbx_xcvr::sbx_version4::set_lo_freq(dboard_iface::unit_t unit, double tar
         "SBX tune: target frequency %f Mhz"
     ) % (target_freq/1e6) << std::endl;
 
+    /*
+     * If the user sets 'mode_n=int-n' in the tuning args, the user wishes to
+     * tune in Integer-N mode, which can result in better spur
+     * performance on some mixers. The default is fractional tuning.
+     */
+    property_tree::sptr subtree = (unit == dboard_iface::UNIT_RX) ? self_base->get_rx_subtree()
+                                                                  : self_base->get_tx_subtree();
+    device_addr_t tune_args = subtree->access<device_addr_t>("tune_args").get();
+    bool is_int_n = (tune_args.get("mode_n","") == "int-n");
+
     //clip the input
     target_freq = sbx_freq_range.clip(target_freq);
 
@@ -70,7 +81,7 @@ double sbx_xcvr::sbx_version4::set_lo_freq(dboard_iface::unit_t unit, double tar
     adf4351_regs_t::prescaler_t prescaler = target_freq > 3.6e9 ? adf4351_regs_t::PRESCALER_8_9 : adf4351_regs_t::PRESCALER_4_5;
 
     adf435x_tuning_constraints tuning_constraints;
-    tuning_constraints.force_frac0 = false;
+    tuning_constraints.force_frac0 = is_int_n;
     tuning_constraints.band_sel_freq_max = 100e3;
     tuning_constraints.ref_doubler_threshold = 12.5e6;
     tuning_constraints.int_range = uhd::range_t(prescaler_to_min_int_div[prescaler], 4095);  //INT is a 12-bit field
@@ -78,7 +89,7 @@ double sbx_xcvr::sbx_version4::set_lo_freq(dboard_iface::unit_t unit, double tar
     tuning_constraints.rf_divider_range = uhd::range_t(1, 64);
 
     double actual_freq;
-    adf435x_tuning_settings tuning_settings = _tune_adf435x_synth(
+    adf435x_tuning_settings tuning_settings = tune_adf435x_synth(
         target_freq, self_base->get_iface()->get_clock_rate(unit),
         tuning_constraints, actual_freq);
 
@@ -109,6 +120,9 @@ double sbx_xcvr::sbx_version4::set_lo_freq(dboard_iface::unit_t unit, double tar
     regs.band_select_clock_div  = tuning_settings.band_select_clock_div;
     UHD_ASSERT_THROW(rfdivsel_to_enum.has_key(tuning_settings.rf_divider));
     regs.rf_divider_select      = rfdivsel_to_enum[tuning_settings.rf_divider];
+    regs.ldf                    = is_int_n ?
+                                    adf4351_regs_t::LDF_INT_N :
+                                    adf4351_regs_t::LDF_FRAC_N;
 
     //reset the N and R counter
     regs.counter_reset = adf4351_regs_t::COUNTER_RESET_ENABLED;
@@ -119,10 +133,12 @@ double sbx_xcvr::sbx_version4::set_lo_freq(dboard_iface::unit_t unit, double tar
     //correct power-up sequence to write registers (5, 4, 3, 2, 1, 0)
     int addr;
 
+    boost::uint16_t rx_id = self_base->get_rx_id().to_uint16();
+    std::string board_name = (rx_id == 0x0083) ? "SBX-120" : "SBX";
     for(addr=5; addr>=0; addr--){
         UHD_LOGV(often) << boost::format(
-            "SBX SPI Reg (0x%02x): 0x%08x"
-        ) % addr % regs.get_reg(addr) << std::endl;
+            "%s SPI Reg (0x%02x): 0x%08x"
+        ) % board_name.c_str() % addr % regs.get_reg(addr) << std::endl;
         self_base->get_iface()->write_spi(
             unit, spi_config_t::EDGE_RISE,
             regs.get_reg(addr), 32
@@ -131,8 +147,8 @@ double sbx_xcvr::sbx_version4::set_lo_freq(dboard_iface::unit_t unit, double tar
 
     //return the actual frequency
     UHD_LOGV(often) << boost::format(
-        "SBX tune: actual frequency %f Mhz"
-    ) % (actual_freq/1e6) << std::endl;
+        "%s tune: actual frequency %f Mhz"
+    ) % board_name.c_str() % (actual_freq/1e6) << std::endl;
     return actual_freq;
 }
 
diff --git a/host/lib/usrp/dboard/db_wbx_common.cpp b/host/lib/usrp/dboard/db_wbx_common.cpp
index 503e5aabf..97357bc90 100644
--- a/host/lib/usrp/dboard/db_wbx_common.cpp
+++ b/host/lib/usrp/dboard/db_wbx_common.cpp
@@ -1,5 +1,5 @@
 //
-// Copyright 2011-2012 Ettus Research LLC
+// Copyright 2011-2014 Ettus Research LLC
 //
 // This program is free software: you can redistribute it and/or modify
 // it under the terms of the GNU General Public License as published by
@@ -63,8 +63,11 @@ wbx_base::wbx_base(ctor_args_t args) : xcvr_dboard_base(args){
     this->get_iface()->set_clock_enabled(dboard_iface::UNIT_RX, true);
 
     ////////////////////////////////////////////////////////////////////
-    // Register RX properties
+    // Register RX and TX properties
     ////////////////////////////////////////////////////////////////////
+    boost::uint16_t rx_id = this->get_rx_id().to_uint16();
+
+    this->get_rx_subtree()->create<device_addr_t>("tune_args").set(device_addr_t());
     this->get_rx_subtree()->create<sensor_value_t>("sensors/lo_locked")
         .publish(boost::bind(&wbx_base::get_locked, this, dboard_iface::UNIT_RX));
     BOOST_FOREACH(const std::string &name, wbx_rx_gain_ranges.keys()){
@@ -79,30 +82,34 @@ wbx_base::wbx_base(ctor_args_t args) : xcvr_dboard_base(args){
         .subscribe(boost::bind(&wbx_base::set_rx_enabled, this, _1))
         .set(true); //start enabled
     this->get_rx_subtree()->create<bool>("use_lo_offset").set(false);
-    this->get_rx_subtree()->create<double>("bandwidth/value").set(2*20.0e6); //20MHz low-pass, we want complex double-sided
+
+    //Value of bw low-pass dependent on board, we want complex double-sided
+    double bw = (rx_id != 0x0081) ? 20.0e6 : 60.0e6;
+    this->get_rx_subtree()->create<double>("bandwidth/value").set(2*bw);
     this->get_rx_subtree()->create<meta_range_t>("bandwidth/range")
-        .set(freq_range_t(2*20.0e6, 2*20.0e6));
+        .set(freq_range_t(2*bw, 2*bw));
+    this->get_tx_subtree()->create<double>("bandwidth/value").set(2*bw);
+    this->get_tx_subtree()->create<meta_range_t>("bandwidth/range")
+        .set(freq_range_t(2*bw, 2*bw));
 
-    ////////////////////////////////////////////////////////////////////
-    // Register TX properties
-    ////////////////////////////////////////////////////////////////////
+    this->get_tx_subtree()->create<device_addr_t>("tune_args").set(device_addr_t());
     this->get_tx_subtree()->create<sensor_value_t>("sensors/lo_locked")
         .publish(boost::bind(&wbx_base::get_locked, this, dboard_iface::UNIT_TX));
     this->get_tx_subtree()->create<std::string>("connection").set("IQ");
     this->get_tx_subtree()->create<bool>("use_lo_offset").set(false);
-    this->get_tx_subtree()->create<double>("bandwidth/value").set(2*20.0e6); //20MHz low-pass, we want complex double-sided
-    this->get_tx_subtree()->create<meta_range_t>("bandwidth/range")
-        .set(freq_range_t(2*20.0e6, 2*20.0e6));
 
     // instantiate subclass foo
-    switch(get_rx_id().to_uint16()) {
-        case 0x053:
+    switch(rx_id) {
+        case 0x0053:
             db_actual = wbx_versionx_sptr(new wbx_version2(this));
             return;
-        case 0x057:
+        case 0x0057:
             db_actual = wbx_versionx_sptr(new wbx_version3(this));
             return;
-        case 0x063:
+        case 0x0063:
+            db_actual = wbx_versionx_sptr(new wbx_version4(this));
+            return;
+        case 0x0081:
             db_actual = wbx_versionx_sptr(new wbx_version4(this));
             return;
         default:
diff --git a/host/lib/usrp/dboard/db_wbx_common.hpp b/host/lib/usrp/dboard/db_wbx_common.hpp
index d1beb160e..7609beb19 100644
--- a/host/lib/usrp/dboard/db_wbx_common.hpp
+++ b/host/lib/usrp/dboard/db_wbx_common.hpp
@@ -1,5 +1,5 @@
 //
-// Copyright 2011 Ettus Research LLC
+// Copyright 2011,2013 Ettus Research LLC
 //
 // This program is free software: you can redistribute it and/or modify
 // it under the terms of the GNU General Public License as published by
@@ -18,15 +18,9 @@
 #ifndef INCLUDED_LIBUHD_USRP_DBOARD_DB_WBX_COMMON_HPP
 #define INCLUDED_LIBUHD_USRP_DBOARD_DB_WBX_COMMON_HPP
 
-// Common IO Pins
-#define ADF4350_CE      (1 << 3)
-#define ADF4350_PDBRF   (1 << 2)
-#define ADF4350_MUXOUT  (1 << 1)                // INPUT!!!
-#define ADF4351_CE      (1 << 3)
-#define ADF4351_PDBRF   (1 << 2)
-#define ADF4351_MUXOUT  (1 << 1)                // INPUT!!!
+#include <uhd/types/device_addr.hpp>
 
-#define LOCKDET_MASK    (1 << 0)                // INPUT!!!
+#include "../common/adf435x_common.hpp"
 
 // TX IO Pins
 #define TX_PUP_5V       (1 << 7)                // enables 5.0V power supply
@@ -38,10 +32,6 @@
 #define RX_PUP_3V       (1 << 6)                // enables 3.3V supply
 #define RXBB_PDB        (1 << 4)                // on UNIT_RX, 1 powers up RX baseband
 
-// RX Attenuator Pins
-#define RX_ATTN_SHIFT   8                       // lsb of RX Attenuator Control
-#define RX_ATTN_MASK    (63 << RX_ATTN_SHIFT)      // valid bits of RX Attenuator Control
-
 // TX Attenuator Pins (v3 only)
 #define TX_ATTN_16      (1 << 14)
 #define TX_ATTN_8       (1 << 5)
@@ -51,17 +41,17 @@
 #define TX_ATTN_MASK    (TX_ATTN_16|TX_ATTN_8|TX_ATTN_4|TX_ATTN_2|TX_ATTN_1)      // valid bits of TX Attenuator Control
 
 // Mixer functions
-#define TX_MIXER_ENB    (TXMOD_EN|ADF4350_PDBRF)    // for v3, TXMOD_EN tied to ADF4350_PDBRF rather than separate
+#define TX_MIXER_ENB    (TXMOD_EN|ADF435X_PDBRF)    // for v3, TXMOD_EN tied to ADF435X_PDBRF rather than separate
 #define TX_MIXER_DIS    0
 
-#define RX_MIXER_ENB    (RXBB_PDB|ADF4350_PDBRF)
+#define RX_MIXER_ENB    (RXBB_PDB|ADF435X_PDBRF)
 #define RX_MIXER_DIS    0
 
 // Power functions
 #define TX_POWER_UP     (TX_PUP_5V|TX_PUP_3V) // high enables power supply
 #define TX_POWER_DOWN   0
 
-#define RX_POWER_UP     (RX_PUP_5V|RX_PUP_3V|ADF4350_CE) // high enables power supply
+#define RX_POWER_UP     (RX_PUP_5V|RX_PUP_3V|ADF435X_CE) // high enables power supply
 #define RX_POWER_DOWN   0
 
 
@@ -86,6 +76,23 @@ namespace uhd{ namespace usrp{
 static const uhd::dict<std::string, gain_range_t> wbx_rx_gain_ranges = boost::assign::map_list_of
     ("PGA0", gain_range_t(0, 31.5, 0.5));
 
+static const freq_range_t wbx_tx_lo_5dbm = boost::assign::list_of
+    (range_t(0.05e9, 1.7e9))
+    (range_t(1.9e9, 2.2e9))
+;
+
+static const freq_range_t wbx_tx_lo_m1dbm = boost::assign::list_of
+    (range_t(1.7e9, 1.9e9))
+;
+
+static const freq_range_t wbx_rx_lo_5dbm = boost::assign::list_of
+    (range_t(0.05e9, 1.4e9))
+;
+
+static const freq_range_t wbx_rx_lo_2dbm = boost::assign::list_of
+    (range_t(1.4e9, 2.2e9))
+;
+
 
 /***********************************************************************
  * The WBX dboard base class
diff --git a/host/lib/usrp/dboard/db_wbx_simple.cpp b/host/lib/usrp/dboard/db_wbx_simple.cpp
index 4ba30255d..c8f2be155 100644
--- a/host/lib/usrp/dboard/db_wbx_simple.cpp
+++ b/host/lib/usrp/dboard/db_wbx_simple.cpp
@@ -71,6 +71,8 @@ UHD_STATIC_BLOCK(reg_wbx_simple_dboards){
     dboard_manager::register_dboard(0x0057, 0x004f, &make_wbx_simple, "WBX v3 + Simple GDB");
     dboard_manager::register_dboard(0x0063, 0x0062, &make_wbx_simple, "WBX v4");
     dboard_manager::register_dboard(0x0063, 0x004f, &make_wbx_simple, "WBX v4 + Simple GDB");
+    dboard_manager::register_dboard(0x0081, 0x0080, &make_wbx_simple, "WBX-120");
+    dboard_manager::register_dboard(0x0081, 0x004f, &make_wbx_simple, "WBX-120 + Simple GDB");
 }
 
 /***********************************************************************
diff --git a/host/lib/usrp/dboard/db_wbx_version2.cpp b/host/lib/usrp/dboard/db_wbx_version2.cpp
index 5f6118a91..2afdce4cd 100644
--- a/host/lib/usrp/dboard/db_wbx_version2.cpp
+++ b/host/lib/usrp/dboard/db_wbx_version2.cpp
@@ -1,5 +1,5 @@
 //
-// Copyright 2011-2012 Ettus Research LLC
+// Copyright 2011-2014 Ettus Research LLC
 //
 // This program is free software: you can redistribute it and/or modify
 // it under the terms of the GNU General Public License as published by
@@ -17,6 +17,8 @@
 
 #include "db_wbx_common.hpp"
 #include "adf4350_regs.hpp"
+#include "../common/adf435x_common.hpp"
+#include <uhd/types/tune_request.hpp>
 #include <uhd/utils/log.hpp>
 #include <uhd/types/dict.hpp>
 #include <uhd/types/ranges.hpp>
@@ -104,14 +106,14 @@ wbx_base::wbx_version2::wbx_version2(wbx_base *_self_wbx_base) {
         .set(true); //start enabled
 
     //set attenuator control bits
-    int v2_iobits = ADF4350_CE;
-    int v2_tx_mod = TXMOD_EN|ADF4350_PDBRF;
+    int v2_iobits = ADF435X_CE;
+    int v2_tx_mod = TXMOD_EN|ADF435X_PDBRF;
 
     //set the gpio directions and atr controls
     self_base->get_iface()->set_pin_ctrl(dboard_iface::UNIT_TX, v2_tx_mod);
-    self_base->get_iface()->set_pin_ctrl(dboard_iface::UNIT_RX, RXBB_PDB|ADF4350_PDBRF);
+    self_base->get_iface()->set_pin_ctrl(dboard_iface::UNIT_RX, RXBB_PDB|ADF435X_PDBRF);
     self_base->get_iface()->set_gpio_ddr(dboard_iface::UNIT_TX, TX_PUP_5V|TX_PUP_3V|v2_tx_mod|v2_iobits);
-    self_base->get_iface()->set_gpio_ddr(dboard_iface::UNIT_RX, RX_PUP_5V|RX_PUP_3V|ADF4350_CE|RXBB_PDB|ADF4350_PDBRF|RX_ATTN_MASK);
+    self_base->get_iface()->set_gpio_ddr(dboard_iface::UNIT_RX, RX_PUP_5V|RX_PUP_3V|ADF435X_CE|RXBB_PDB|ADF435X_PDBRF|RX_ATTN_MASK);
 
     //setup ATR for the mixer enables (always enabled to prevent phase slip between bursts)
     self_base->get_iface()->set_atr_reg(dboard_iface::UNIT_TX, dboard_iface::ATR_REG_IDLE,        v2_tx_mod, TX_MIXER_DIS | v2_tx_mod);
@@ -134,7 +136,7 @@ wbx_base::wbx_version2::~wbx_version2(void){
  **********************************************************************/
 void wbx_base::wbx_version2::set_tx_enabled(bool enb){
     self_base->get_iface()->set_gpio_out(dboard_iface::UNIT_TX,
-        (enb)? TX_POWER_UP | ADF4350_CE : TX_POWER_DOWN, TX_POWER_UP | TX_POWER_DOWN | ADF4350_CE);
+        (enb)? TX_POWER_UP | ADF435X_CE : TX_POWER_DOWN, TX_POWER_UP | TX_POWER_DOWN | ADF435X_CE);
 }
 
 
@@ -166,8 +168,15 @@ double wbx_base::wbx_version2::set_lo_freq(dboard_iface::unit_t unit, double tar
         "WBX tune: target frequency %f Mhz"
     ) % (target_freq/1e6) << std::endl;
 
-    //start with target_freq*2 because mixer has divide by 2
-    target_freq *= 2;
+    /*
+     * If the user sets 'mode_n=int-n' in the tuning args, the user wishes to
+     * tune in Integer-N mode, which can result in better spur
+     * performance on some mixers. The default is fractional tuning.
+     */
+    property_tree::sptr subtree = (unit == dboard_iface::UNIT_RX) ? self_base->get_rx_subtree()
+                                                                  : self_base->get_tx_subtree();
+    device_addr_t tune_args = subtree->access<device_addr_t>("tune_args").get();
+    bool is_int_n = (tune_args.get("mode_n","") == "int-n");
 
     //map prescaler setting to mininmum integer divider (N) values (pg.18 prescaler)
     static const uhd::dict<int, int> prescaler_to_min_int_div = map_list_of
@@ -184,137 +193,53 @@ double wbx_base::wbx_version2::set_lo_freq(dboard_iface::unit_t unit, double tar
         (16, adf4350_regs_t::RF_DIVIDER_SELECT_DIV16)
     ;
 
-    double actual_freq, pfd_freq;
-    double ref_freq = self_base->get_iface()->get_clock_rate(unit);
-    int R=0, BS=0, N=0, FRAC=0, MOD=0;
-    int RFdiv = 1;
-    adf4350_regs_t::reference_divide_by_2_t T     = adf4350_regs_t::REFERENCE_DIVIDE_BY_2_DISABLED;
-    adf4350_regs_t::reference_doubler_t     D     = adf4350_regs_t::REFERENCE_DOUBLER_DISABLED;    
-
-    //Reference doubler for 50% duty cycle
-    // if ref_freq < 12.5MHz enable regs.reference_divide_by_2
-    if(ref_freq <= 12.5e6) D = adf4350_regs_t::REFERENCE_DOUBLER_ENABLED;
-
-    //increase RF divider until acceptable VCO frequency
-    const bool do_sync = (target_freq/2 > ref_freq);
-    double vco_freq = target_freq;
-    while (vco_freq < 2.2e9) {
-        vco_freq *= 2;
-        RFdiv *= 2;
-    }
-    if (do_sync) vco_freq = target_freq;
-
-    //use 8/9 prescaler for vco_freq > 3 GHz (pg.18 prescaler)
-    adf4350_regs_t::prescaler_t prescaler = vco_freq > 3e9 ? adf4350_regs_t::PRESCALER_8_9 : adf4350_regs_t::PRESCALER_4_5;
-
-    /*
-     * The goal here is to loop though possible R dividers,
-     * band select clock dividers, N (int) dividers, and FRAC 
-     * (frac) dividers.
-     *
-     * Calculate the N and F dividers for each set of values.
-     * The loop exits when it meets all of the constraints.
-     * The resulting loop values are loaded into the registers.
-     *
-     * from pg.21
-     *
-     * f_pfd = f_ref*(1+D)/(R*(1+T))
-     * f_vco = (N + (FRAC/MOD))*f_pfd
-     *    N = f_vco/f_pfd - FRAC/MOD = f_vco*((R*(T+1))/(f_ref*(1+D))) - FRAC/MOD
-     * f_rf = f_vco/RFdiv)
-     * f_actual = f_rf/2
-     */
-    for(R = 1; R <= 1023; R+=1){
-        //PFD input frequency = f_ref/R ... ignoring Reference doubler/divide-by-2 (D & T)
-        pfd_freq = ref_freq*(1+D)/(R*(1+T));
-
-        //keep the PFD frequency at or below 25MHz (Loop Filter Bandwidth)
-        if (pfd_freq > 25e6) continue;
-
-        //ignore fractional part of tuning
-        N = int(std::floor(vco_freq/pfd_freq));
-
-        //keep N > minimum int divider requirement
-        if (N < prescaler_to_min_int_div[prescaler]) continue;
-
-        for(BS=1; BS <= 255; BS+=1){
-            //keep the band select frequency at or below 100KHz
-            //constraint on band select clock
-            if (pfd_freq/BS > 100e3) continue;
-            goto done_loop;
-        }
-    } done_loop:
-
-    //Fractional-N calculation
-    MOD = 4095; //max fractional accuracy
-    FRAC = int((vco_freq/pfd_freq - N)*MOD);
-
-    //Reference divide-by-2 for 50% duty cycle
-    // if R even, move one divide by 2 to to regs.reference_divide_by_2
-    if(R % 2 == 0){
-        T = adf4350_regs_t::REFERENCE_DIVIDE_BY_2_ENABLED;
-        R /= 2;
-    }
+    adf4350_regs_t::prescaler_t prescaler = target_freq > 3e9 ? adf4350_regs_t::PRESCALER_8_9 : adf4350_regs_t::PRESCALER_4_5;
 
-    //actual frequency calculation
-    actual_freq = double((N + (double(FRAC)/double(MOD)))*ref_freq*(1+int(D))/(R*(1+int(T)))/2/(vco_freq/target_freq));
+    adf435x_tuning_constraints tuning_constraints;
+    tuning_constraints.force_frac0 = is_int_n;
+    tuning_constraints.band_sel_freq_max = 100e3;
+    tuning_constraints.ref_doubler_threshold = 12.5e6;
+    tuning_constraints.int_range = uhd::range_t(prescaler_to_min_int_div[prescaler], 4095);
+    tuning_constraints.pfd_freq_max = 25e6;
+    tuning_constraints.rf_divider_range = uhd::range_t(1, 16);
 
-    UHD_LOGV(often)
-        << boost::format("WBX Intermediates: ref=%0.2f, outdiv=%f, fbdiv=%f") % (ref_freq*(1+int(D))/(R*(1+int(T)))) % double(RFdiv*2) % double(N + double(FRAC)/double(MOD)) << std::endl
-
-        << boost::format("WBX tune: R=%d, BS=%d, N=%d, FRAC=%d, MOD=%d, T=%d, D=%d, RFdiv=%d"
-            ) % R % BS % N % FRAC % MOD % T % D % RFdiv << std::endl
-        << boost::format("WBX Frequencies (MHz): REQ=%0.2f, ACT=%0.2f, VCO=%0.2f, PFD=%0.2f, BAND=%0.2f"
-            ) % (target_freq/1e6) % (actual_freq/1e6) % (vco_freq/1e6) % (pfd_freq/1e6) % (pfd_freq/BS/1e6) << std::endl;
+    double actual_freq;
+    adf435x_tuning_settings tuning_settings = tune_adf435x_synth(
+        target_freq, self_base->get_iface()->get_clock_rate(unit),
+        tuning_constraints, actual_freq);
 
     //load the register values
     adf4350_regs_t regs;
 
-    regs.frac_12_bit = FRAC;
-    regs.int_16_bit = N;
-    regs.mod_12_bit = MOD;
-    if (do_sync)
-    {
-        regs.clock_divider_12_bit = std::max(1, int(std::ceil(400e-6*pfd_freq/MOD)));
-        regs.feedback_select = adf4350_regs_t::FEEDBACK_SELECT_DIVIDED;
-        regs.clock_div_mode = adf4350_regs_t::CLOCK_DIV_MODE_RESYNC_ENABLE;
-    }
-    regs.prescaler = prescaler;
-    regs.r_counter_10_bit = R;
-    regs.reference_divide_by_2 = T;
-    regs.reference_doubler = D;
-    regs.band_select_clock_div = BS;
-    UHD_ASSERT_THROW(rfdivsel_to_enum.has_key(RFdiv));
-    regs.rf_divider_select = rfdivsel_to_enum[RFdiv];
-
-    if (unit == dboard_iface::UNIT_RX) {
-        freq_range_t rx_lo_5dbm = list_of
-            (range_t(0.05e9, 1.4e9))
-        ;
-
-        freq_range_t rx_lo_2dbm = list_of
-            (range_t(1.4e9, 2.2e9))
-        ;
-
-        if (actual_freq == rx_lo_5dbm.clip(actual_freq)) regs.output_power = adf4350_regs_t::OUTPUT_POWER_5DBM;
-
-        if (actual_freq == rx_lo_2dbm.clip(actual_freq)) regs.output_power = adf4350_regs_t::OUTPUT_POWER_2DBM;
-
-    } else if (unit == dboard_iface::UNIT_TX) {
-        freq_range_t tx_lo_5dbm = list_of
-            (range_t(0.05e9, 1.7e9))
-            (range_t(1.9e9, 2.2e9))
-        ;
-
-        freq_range_t tx_lo_m1dbm = list_of
-            (range_t(1.7e9, 1.9e9))
-        ;
-
-        if (actual_freq == tx_lo_5dbm.clip(actual_freq)) regs.output_power = adf4350_regs_t::OUTPUT_POWER_5DBM;
-
-        if (actual_freq == tx_lo_m1dbm.clip(actual_freq)) regs.output_power = adf4350_regs_t::OUTPUT_POWER_M1DBM;
-
-    }
+    if (unit == dboard_iface::UNIT_RX)
+        regs.output_power = (actual_freq == wbx_rx_lo_5dbm.clip(actual_freq)) ? adf4350_regs_t::OUTPUT_POWER_5DBM
+                                                                              : adf4350_regs_t::OUTPUT_POWER_2DBM;
+    else
+        regs.output_power = (actual_freq == wbx_tx_lo_5dbm.clip(actual_freq)) ? adf4350_regs_t::OUTPUT_POWER_5DBM
+                                                                              : adf4350_regs_t::OUTPUT_POWER_M1DBM;
+
+    regs.frac_12_bit            = tuning_settings.frac_12_bit;
+    regs.int_16_bit             = tuning_settings.int_16_bit;
+    regs.mod_12_bit             = tuning_settings.mod_12_bit;
+    regs.clock_divider_12_bit   = tuning_settings.clock_divider_12_bit;
+    regs.feedback_select        = tuning_settings.feedback_after_divider ?
+                                    adf4350_regs_t::FEEDBACK_SELECT_DIVIDED :
+                                    adf4350_regs_t::FEEDBACK_SELECT_FUNDAMENTAL;
+    regs.clock_div_mode         = adf4350_regs_t::CLOCK_DIV_MODE_RESYNC_ENABLE;
+    regs.prescaler              = prescaler;
+    regs.r_counter_10_bit       = tuning_settings.r_counter_10_bit;
+    regs.reference_divide_by_2  = tuning_settings.r_divide_by_2_en ?
+                                    adf4350_regs_t::REFERENCE_DIVIDE_BY_2_ENABLED :
+                                    adf4350_regs_t::REFERENCE_DIVIDE_BY_2_DISABLED;
+    regs.reference_doubler      = tuning_settings.r_doubler_en ?
+                                    adf4350_regs_t::REFERENCE_DOUBLER_ENABLED :
+                                    adf4350_regs_t::REFERENCE_DOUBLER_DISABLED;
+    regs.band_select_clock_div  = tuning_settings.band_select_clock_div;
+    UHD_ASSERT_THROW(rfdivsel_to_enum.has_key(tuning_settings.rf_divider));
+    regs.rf_divider_select      = rfdivsel_to_enum[tuning_settings.rf_divider];
+    regs.ldf                    = is_int_n ?
+                                    adf4350_regs_t::LDF_INT_N :
+                                    adf4350_regs_t::LDF_FRAC_N;
 
     //reset the N and R counter
     regs.counter_reset = adf4350_regs_t::COUNTER_RESET_ENABLED;
diff --git a/host/lib/usrp/dboard/db_wbx_version3.cpp b/host/lib/usrp/dboard/db_wbx_version3.cpp
index 3e8fc8095..e30d6c665 100644
--- a/host/lib/usrp/dboard/db_wbx_version3.cpp
+++ b/host/lib/usrp/dboard/db_wbx_version3.cpp
@@ -1,5 +1,5 @@
 //
-// Copyright 2011-2012 Ettus Research LLC
+// Copyright 2011-2014 Ettus Research LLC
 //
 // This program is free software: you can redistribute it and/or modify
 // it under the terms of the GNU General Public License as published by
@@ -17,6 +17,7 @@
 
 #include "db_wbx_common.hpp"
 #include "adf4350_regs.hpp"
+#include "../common/adf435x_common.hpp"
 #include <uhd/utils/log.hpp>
 #include <uhd/types/dict.hpp>
 #include <uhd/types/ranges.hpp>
@@ -111,17 +112,17 @@ wbx_base::wbx_version3::wbx_version3(wbx_base *_self_wbx_base) {
 
     //set attenuator control bits
     int v3_iobits = TX_ATTN_MASK;
-    int v3_tx_mod = ADF4350_PDBRF;
+    int v3_tx_mod = ADF435X_PDBRF;
 
     //set the gpio directions and atr controls
     self_base->get_iface()->set_pin_ctrl(dboard_iface::UNIT_TX, \
             v3_tx_mod|v3_iobits);
     self_base->get_iface()->set_pin_ctrl(dboard_iface::UNIT_RX, \
-            RXBB_PDB|ADF4350_PDBRF);
+            RXBB_PDB|ADF435X_PDBRF);
     self_base->get_iface()->set_gpio_ddr(dboard_iface::UNIT_TX, \
             TX_PUP_5V|TX_PUP_3V|v3_tx_mod|v3_iobits);
     self_base->get_iface()->set_gpio_ddr(dboard_iface::UNIT_RX, \
-            RX_PUP_5V|RX_PUP_3V|ADF4350_CE|RXBB_PDB|ADF4350_PDBRF|RX_ATTN_MASK);
+            RX_PUP_5V|RX_PUP_3V|ADF435X_CE|RXBB_PDB|ADF435X_PDBRF|RX_ATTN_MASK);
 
     //setup ATR for the mixer enables (always enabled to prevent phase
     //slip between bursts).  set TX gain iobits to min gain (max attenuation)
@@ -163,7 +164,7 @@ wbx_base::wbx_version3::~wbx_version3(void){
  **********************************************************************/
 void wbx_base::wbx_version3::set_tx_enabled(bool enb){
     self_base->get_iface()->set_gpio_out(dboard_iface::UNIT_TX,
-        (enb)? TX_POWER_UP | ADF4350_CE : TX_POWER_DOWN, TX_POWER_UP | TX_POWER_DOWN | 0);
+        (enb)? TX_POWER_UP | ADF435X_CE : TX_POWER_DOWN, TX_POWER_UP | TX_POWER_DOWN | 0);
 }
 
 
@@ -198,8 +199,15 @@ double wbx_base::wbx_version3::set_lo_freq(dboard_iface::unit_t unit, double tar
         "WBX tune: target frequency %f Mhz"
     ) % (target_freq/1e6) << std::endl;
 
-    //start with target_freq*2 because mixer has divide by 2
-    target_freq *= 2;
+    /*
+     * If the user sets 'mode_n=int-n' in the tuning args, the user wishes to
+     * tune in Integer-N mode, which can result in better spur
+     * performance on some mixers. The default is fractional tuning.
+     */
+    property_tree::sptr subtree = (unit == dboard_iface::UNIT_RX) ? self_base->get_rx_subtree()
+                                                                  : self_base->get_tx_subtree();
+    device_addr_t tune_args = subtree->access<device_addr_t>("tune_args").get();
+    bool is_int_n = (tune_args.get("mode_n","") == "int-n");
 
     //map prescaler setting to mininmum integer divider (N) values (pg.18 prescaler)
     static const uhd::dict<int, int> prescaler_to_min_int_div = map_list_of
@@ -216,137 +224,53 @@ double wbx_base::wbx_version3::set_lo_freq(dboard_iface::unit_t unit, double tar
         (16, adf4350_regs_t::RF_DIVIDER_SELECT_DIV16)
     ;
 
-    double actual_freq, pfd_freq;
-    double ref_freq = self_base->get_iface()->get_clock_rate(unit);
-    int R=0, BS=0, N=0, FRAC=0, MOD=0;
-    int RFdiv = 1;
-    adf4350_regs_t::reference_divide_by_2_t T     = adf4350_regs_t::REFERENCE_DIVIDE_BY_2_DISABLED;
-    adf4350_regs_t::reference_doubler_t     D     = adf4350_regs_t::REFERENCE_DOUBLER_DISABLED;    
-
-    //Reference doubler for 50% duty cycle
-    // if ref_freq < 12.5MHz enable regs.reference_divide_by_2
-    if(ref_freq <= 12.5e6) D = adf4350_regs_t::REFERENCE_DOUBLER_ENABLED;
-
-    //increase RF divider until acceptable VCO frequency
-    const bool do_sync = (target_freq/2 > ref_freq);
-    double vco_freq = target_freq;
-    while (vco_freq < 2.2e9) {
-        vco_freq *= 2;
-        RFdiv *= 2;
-    }
-    if (do_sync) vco_freq = target_freq;
-
-    //use 8/9 prescaler for vco_freq > 3 GHz (pg.18 prescaler)
-    adf4350_regs_t::prescaler_t prescaler = vco_freq > 3e9 ? adf4350_regs_t::PRESCALER_8_9 : adf4350_regs_t::PRESCALER_4_5;
-
-    /*
-     * The goal here is to loop though possible R dividers,
-     * band select clock dividers, N (int) dividers, and FRAC 
-     * (frac) dividers.
-     *
-     * Calculate the N and F dividers for each set of values.
-     * The loop exits when it meets all of the constraints.
-     * The resulting loop values are loaded into the registers.
-     *
-     * from pg.21
-     *
-     * f_pfd = f_ref*(1+D)/(R*(1+T))
-     * f_vco = (N + (FRAC/MOD))*f_pfd
-     *    N = f_vco/f_pfd - FRAC/MOD = f_vco*((R*(T+1))/(f_ref*(1+D))) - FRAC/MOD
-     * f_rf = f_vco/RFdiv)
-     * f_actual = f_rf/2
-     */
-    for(R = 1; R <= 1023; R+=1){
-        //PFD input frequency = f_ref/R ... ignoring Reference doubler/divide-by-2 (D & T)
-        pfd_freq = ref_freq*(1+D)/(R*(1+T));
-
-        //keep the PFD frequency at or below 25MHz (Loop Filter Bandwidth)
-        if (pfd_freq > 25e6) continue;
-
-        //ignore fractional part of tuning
-        N = int(std::floor(vco_freq/pfd_freq));
-
-        //keep N > minimum int divider requirement
-        if (N < prescaler_to_min_int_div[prescaler]) continue;
-
-        for(BS=1; BS <= 255; BS+=1){
-            //keep the band select frequency at or below 100KHz
-            //constraint on band select clock
-            if (pfd_freq/BS > 100e3) continue;
-            goto done_loop;
-        }
-    } done_loop:
-
-    //Fractional-N calculation
-    MOD = 4095; //max fractional accuracy
-    FRAC = int((vco_freq/pfd_freq - N)*MOD);
-
-    //Reference divide-by-2 for 50% duty cycle
-    // if R even, move one divide by 2 to to regs.reference_divide_by_2
-    if(R % 2 == 0){
-        T = adf4350_regs_t::REFERENCE_DIVIDE_BY_2_ENABLED;
-        R /= 2;
-    }
-
-    //actual frequency calculation
-    actual_freq = double((N + (double(FRAC)/double(MOD)))*ref_freq*(1+int(D))/(R*(1+int(T)))/2/(vco_freq/target_freq));
-
-    UHD_LOGV(often)
-        << boost::format("WBX Intermediates: ref=%0.2f, outdiv=%f, fbdiv=%f") % (ref_freq*(1+int(D))/(R*(1+int(T)))) % double(RFdiv*2) % double(N + double(FRAC)/double(MOD)) << std::endl
-
-        << boost::format("WBX tune: R=%d, BS=%d, N=%d, FRAC=%d, MOD=%d, T=%d, D=%d, RFdiv=%d"
-            ) % R % BS % N % FRAC % MOD % T % D % RFdiv << std::endl
-        << boost::format("WBX Frequencies (MHz): REQ=%0.2f, ACT=%0.2f, VCO=%0.2f, PFD=%0.2f, BAND=%0.2f"
-            ) % (target_freq/1e6) % (actual_freq/1e6) % (vco_freq/1e6) % (pfd_freq/1e6) % (pfd_freq/BS/1e6) << std::endl;
+    adf4350_regs_t::prescaler_t prescaler = target_freq > 3e9 ? adf4350_regs_t::PRESCALER_8_9 : adf4350_regs_t::PRESCALER_4_5;
+    
+    adf435x_tuning_constraints tuning_constraints;
+    tuning_constraints.force_frac0 = is_int_n;
+    tuning_constraints.band_sel_freq_max = 100e3;
+    tuning_constraints.ref_doubler_threshold = 12.5e6;
+    tuning_constraints.int_range = uhd::range_t(prescaler_to_min_int_div[prescaler], 4095);
+    tuning_constraints.pfd_freq_max = 25e6;
+    tuning_constraints.rf_divider_range = uhd::range_t(1, 16);
+
+    double actual_freq;
+    adf435x_tuning_settings tuning_settings = tune_adf435x_synth(
+        target_freq, self_base->get_iface()->get_clock_rate(unit),
+        tuning_constraints, actual_freq);
 
     //load the register values
     adf4350_regs_t regs;
 
-    regs.frac_12_bit = FRAC;
-    regs.int_16_bit = N;
-    regs.mod_12_bit = MOD;
-    if (do_sync)
-    {
-        regs.clock_divider_12_bit = std::max(1, int(std::ceil(400e-6*pfd_freq/MOD)));
-        regs.feedback_select = adf4350_regs_t::FEEDBACK_SELECT_DIVIDED;
-        regs.clock_div_mode = adf4350_regs_t::CLOCK_DIV_MODE_RESYNC_ENABLE;
-    }
-    regs.prescaler = prescaler;
-    regs.r_counter_10_bit = R;
-    regs.reference_divide_by_2 = T;
-    regs.reference_doubler = D;
-    regs.band_select_clock_div = BS;
-    UHD_ASSERT_THROW(rfdivsel_to_enum.has_key(RFdiv));
-    regs.rf_divider_select = rfdivsel_to_enum[RFdiv];
-
-    if (unit == dboard_iface::UNIT_RX) {
-        freq_range_t rx_lo_5dbm = list_of
-            (range_t(0.05e9, 1.4e9))
-        ;
-
-        freq_range_t rx_lo_2dbm = list_of
-            (range_t(1.4e9, 2.2e9))
-        ;
-
-        if (actual_freq == rx_lo_5dbm.clip(actual_freq)) regs.output_power = adf4350_regs_t::OUTPUT_POWER_5DBM;
-
-        if (actual_freq == rx_lo_2dbm.clip(actual_freq)) regs.output_power = adf4350_regs_t::OUTPUT_POWER_2DBM;
-
-    } else if (unit == dboard_iface::UNIT_TX) {
-        freq_range_t tx_lo_5dbm = list_of
-            (range_t(0.05e9, 1.7e9))
-            (range_t(1.9e9, 2.2e9))
-        ;
-
-        freq_range_t tx_lo_m1dbm = list_of
-            (range_t(1.7e9, 1.9e9))
-        ;
-
-        if (actual_freq == tx_lo_5dbm.clip(actual_freq)) regs.output_power = adf4350_regs_t::OUTPUT_POWER_5DBM;
-
-        if (actual_freq == tx_lo_m1dbm.clip(actual_freq)) regs.output_power = adf4350_regs_t::OUTPUT_POWER_M1DBM;
-
-    }
+    if (unit == dboard_iface::UNIT_RX)
+        regs.output_power = (actual_freq == wbx_rx_lo_5dbm.clip(actual_freq)) ? adf4350_regs_t::OUTPUT_POWER_5DBM
+                                                                              : adf4350_regs_t::OUTPUT_POWER_2DBM;
+    else
+        regs.output_power = (actual_freq == wbx_tx_lo_5dbm.clip(actual_freq)) ? adf4350_regs_t::OUTPUT_POWER_5DBM
+                                                                              : adf4350_regs_t::OUTPUT_POWER_M1DBM;
+
+    regs.frac_12_bit            = tuning_settings.frac_12_bit;
+    regs.int_16_bit             = tuning_settings.int_16_bit;
+    regs.mod_12_bit             = tuning_settings.mod_12_bit;
+    regs.clock_divider_12_bit   = tuning_settings.clock_divider_12_bit;
+    regs.feedback_select        = tuning_settings.feedback_after_divider ?
+                                    adf4350_regs_t::FEEDBACK_SELECT_DIVIDED :
+                                    adf4350_regs_t::FEEDBACK_SELECT_FUNDAMENTAL;
+    regs.clock_div_mode         = adf4350_regs_t::CLOCK_DIV_MODE_RESYNC_ENABLE;
+    regs.prescaler              = prescaler;
+    regs.r_counter_10_bit       = tuning_settings.r_counter_10_bit;
+    regs.reference_divide_by_2  = tuning_settings.r_divide_by_2_en ?
+                                    adf4350_regs_t::REFERENCE_DIVIDE_BY_2_ENABLED :
+                                    adf4350_regs_t::REFERENCE_DIVIDE_BY_2_DISABLED;
+    regs.reference_doubler      = tuning_settings.r_doubler_en ?
+                                    adf4350_regs_t::REFERENCE_DOUBLER_ENABLED :
+                                    adf4350_regs_t::REFERENCE_DOUBLER_DISABLED;
+    regs.band_select_clock_div  = tuning_settings.band_select_clock_div;
+    UHD_ASSERT_THROW(rfdivsel_to_enum.has_key(tuning_settings.rf_divider));
+    regs.rf_divider_select      = rfdivsel_to_enum[tuning_settings.rf_divider];
+    regs.ldf                    = is_int_n ?
+                                    adf4350_regs_t::LDF_INT_N :
+                                    adf4350_regs_t::LDF_FRAC_N;
 
     //reset the N and R counter
     regs.counter_reset = adf4350_regs_t::COUNTER_RESET_ENABLED;
diff --git a/host/lib/usrp/dboard/db_wbx_version4.cpp b/host/lib/usrp/dboard/db_wbx_version4.cpp
index 1feea2c0b..dc1ae4df8 100644
--- a/host/lib/usrp/dboard/db_wbx_version4.cpp
+++ b/host/lib/usrp/dboard/db_wbx_version4.cpp
@@ -1,5 +1,5 @@
 //
-// Copyright 2011-2012 Ettus Research LLC
+// Copyright 2011-2014 Ettus Research LLC
 //
 // This program is free software: you can redistribute it and/or modify
 // it under the terms of the GNU General Public License as published by
@@ -17,6 +17,7 @@
 
 #include "db_wbx_common.hpp"
 #include "adf4351_regs.hpp"
+#include "../common/adf435x_common.hpp"
 #include <uhd/utils/log.hpp>
 #include <uhd/types/dict.hpp>
 #include <uhd/types/ranges.hpp>
@@ -35,7 +36,7 @@ using namespace boost::assign;
 
 
 /***********************************************************************
- * WBX Version 3 Constants
+ * WBX Version 4 Constants
  **********************************************************************/
 static const uhd::dict<std::string, gain_range_t> wbx_v4_tx_gain_ranges = map_list_of
     ("PGA0", gain_range_t(0, 31, 1.0))
@@ -85,7 +86,10 @@ wbx_base::wbx_version4::wbx_version4(wbx_base *_self_wbx_base) {
     ////////////////////////////////////////////////////////////////////
     // Register RX properties
     ////////////////////////////////////////////////////////////////////
-    this->get_rx_subtree()->create<std::string>("name").set("WBXv4 RX");
+    boost::uint16_t rx_id = _self_wbx_base->get_rx_id().to_uint16();
+
+    if(rx_id == 0x0063) this->get_rx_subtree()->create<std::string>("name").set("WBXv4 RX");
+    else if(rx_id == 0x0081) this->get_rx_subtree()->create<std::string>("name").set("WBX-120 RX");
     this->get_rx_subtree()->create<double>("freq/value")
          .coerce(boost::bind(&wbx_base::wbx_version4::set_lo_freq, this, dboard_iface::UNIT_RX, _1))
          .set((wbx_v4_freq_range.start() + wbx_v4_freq_range.stop())/2.0);
@@ -94,7 +98,10 @@ wbx_base::wbx_version4::wbx_version4(wbx_base *_self_wbx_base) {
     ////////////////////////////////////////////////////////////////////
     // Register TX properties
     ////////////////////////////////////////////////////////////////////
-    this->get_tx_subtree()->create<std::string>("name").set("WBXv4 TX");
+
+    //get_tx_id() will always return GDB ID, so use RX ID to determine WBXv4 vs. WBX-120
+    if(rx_id == 0x0063) this->get_tx_subtree()->create<std::string>("name").set("WBXv4 TX");
+    else if(rx_id == 0x0081) this->get_tx_subtree()->create<std::string>("name").set("WBX-120 TX");
     BOOST_FOREACH(const std::string &name, wbx_v4_tx_gain_ranges.keys()){
         self_base->get_tx_subtree()->create<double>("gains/"+name+"/value")
             .coerce(boost::bind(&wbx_base::wbx_version4::set_tx_gain, this, _1, name))
@@ -112,17 +119,17 @@ wbx_base::wbx_version4::wbx_version4(wbx_base *_self_wbx_base) {
 
     //set attenuator control bits
     int v4_iobits = TX_ATTN_MASK;
-    int v4_tx_mod = ADF4351_PDBRF;
+    int v4_tx_mod = ADF435X_PDBRF;
 
     //set the gpio directions and atr controls
     self_base->get_iface()->set_pin_ctrl(dboard_iface::UNIT_TX, \
             v4_tx_mod|v4_iobits);
     self_base->get_iface()->set_pin_ctrl(dboard_iface::UNIT_RX, \
-            RXBB_PDB|ADF4351_PDBRF);
+            RXBB_PDB|ADF435X_PDBRF);
     self_base->get_iface()->set_gpio_ddr(dboard_iface::UNIT_TX, \
             TX_PUP_5V|TX_PUP_3V|v4_tx_mod|v4_iobits);
     self_base->get_iface()->set_gpio_ddr(dboard_iface::UNIT_RX, \
-            RX_PUP_5V|RX_PUP_3V|ADF4351_CE|RXBB_PDB|ADF4351_PDBRF|RX_ATTN_MASK);
+            RX_PUP_5V|RX_PUP_3V|ADF435X_CE|RXBB_PDB|ADF435X_PDBRF|RX_ATTN_MASK);
 
     //setup ATR for the mixer enables (always enabled to prevent phase slip
     //between bursts) set TX gain iobits to min gain (max attenuation) when
@@ -164,7 +171,7 @@ wbx_base::wbx_version4::~wbx_version4(void){
  **********************************************************************/
 void wbx_base::wbx_version4::set_tx_enabled(bool enb) {
     self_base->get_iface()->set_gpio_out(dboard_iface::UNIT_TX,
-        (enb)? TX_POWER_UP | ADF4351_CE : TX_POWER_DOWN, TX_POWER_UP | TX_POWER_DOWN | 0);
+        (enb)? TX_POWER_UP | ADF435X_CE : TX_POWER_DOWN, TX_POWER_UP | TX_POWER_DOWN | 0);
 }
 
 
@@ -200,8 +207,15 @@ double wbx_base::wbx_version4::set_lo_freq(dboard_iface::unit_t unit, double tar
         "WBX tune: target frequency %f Mhz"
     ) % (target_freq/1e6) << std::endl;
 
-    //start with target_freq*2 because mixer has divide by 2
-    target_freq *= 2;
+    /*
+     * If the user sets 'mode_n=int-n' in the tuning args, the user wishes to
+     * tune in Integer-N mode, which can result in better spur
+     * performance on some mixers. The default is fractional tuning.
+     */
+    property_tree::sptr subtree = (unit == dboard_iface::UNIT_RX) ? self_base->get_rx_subtree()
+                                                                  : self_base->get_tx_subtree();
+    device_addr_t tune_args = subtree->access<device_addr_t>("tune_args").get();
+    bool is_int_n = (tune_args.get("mode_n","") == "int-n");
 
     //map prescaler setting to mininmum integer divider (N) values (pg.18 prescaler)
     static const uhd::dict<int, int> prescaler_to_min_int_div = map_list_of
@@ -220,137 +234,53 @@ double wbx_base::wbx_version4::set_lo_freq(dboard_iface::unit_t unit, double tar
         (64, adf4351_regs_t::RF_DIVIDER_SELECT_DIV64)
     ;
 
-    double actual_freq, pfd_freq;
-    double ref_freq = self_base->get_iface()->get_clock_rate(unit);
-    int R=0, BS=0, N=0, FRAC=0, MOD=0;
-    int RFdiv = 1;
-    adf4351_regs_t::reference_divide_by_2_t T     = adf4351_regs_t::REFERENCE_DIVIDE_BY_2_DISABLED;
-    adf4351_regs_t::reference_doubler_t     D     = adf4351_regs_t::REFERENCE_DOUBLER_DISABLED;    
-
-    //Reference doubler for 50% duty cycle
-    // if ref_freq < 12.5MHz enable regs.reference_divide_by_2
-    if(ref_freq <= 12.5e6) D = adf4351_regs_t::REFERENCE_DOUBLER_ENABLED;
-
-    //increase RF divider until acceptable VCO frequency
-    const bool do_sync = (target_freq/2 > ref_freq);
-    double vco_freq = target_freq;
-    while (vco_freq < 2.2e9) {
-        vco_freq *= 2;
-        RFdiv *= 2;
-    }
-    if (do_sync) vco_freq = target_freq;
-
-    //use 8/9 prescaler for vco_freq > 3 GHz (pg.18 prescaler)
-    adf4351_regs_t::prescaler_t prescaler = vco_freq > 3e9 ? adf4351_regs_t::PRESCALER_8_9 : adf4351_regs_t::PRESCALER_4_5;
-
-    /*
-     * The goal here is to loop though possible R dividers,
-     * band select clock dividers, N (int) dividers, and FRAC 
-     * (frac) dividers.
-     *
-     * Calculate the N and F dividers for each set of values.
-     * The loop exits when it meets all of the constraints.
-     * The resulting loop values are loaded into the registers.
-     *
-     * from pg.21
-     *
-     * f_pfd = f_ref*(1+D)/(R*(1+T))
-     * f_vco = (N + (FRAC/MOD))*f_pfd
-     *    N = f_vco/f_pfd - FRAC/MOD = f_vco*((R*(T+1))/(f_ref*(1+D))) - FRAC/MOD
-     * f_rf = f_vco/RFdiv)
-     * f_actual = f_rf/2
-     */
-    for(R = 1; R <= 1023; R+=1){
-        //PFD input frequency = f_ref/R ... ignoring Reference doubler/divide-by-2 (D & T)
-        pfd_freq = ref_freq*(1+D)/(R*(1+T));
-
-        //keep the PFD frequency at or below 25MHz (Loop Filter Bandwidth)
-        if (pfd_freq > 25e6) continue;
-
-        //ignore fractional part of tuning
-        N = int(std::floor(vco_freq/pfd_freq));
-
-        //keep N > minimum int divider requirement
-        if (N < prescaler_to_min_int_div[prescaler]) continue;
-
-        for(BS=1; BS <= 255; BS+=1){
-            //keep the band select frequency at or below 100KHz
-            //constraint on band select clock
-            if (pfd_freq/BS > 100e3) continue;
-            goto done_loop;
-        }
-    } done_loop:
-
-    //Fractional-N calculation
-    MOD = 4095; //max fractional accuracy
-    FRAC = int((vco_freq/pfd_freq - N)*MOD);
-
-    //Reference divide-by-2 for 50% duty cycle
-    // if R even, move one divide by 2 to to regs.reference_divide_by_2
-    if(R % 2 == 0){
-        T = adf4351_regs_t::REFERENCE_DIVIDE_BY_2_ENABLED;
-        R /= 2;
-    }
-
-    //actual frequency calculation
-    actual_freq = double((N + (double(FRAC)/double(MOD)))*ref_freq*(1+int(D))/(R*(1+int(T)))/2/(vco_freq/target_freq));
-
-    UHD_LOGV(often)
-        << boost::format("WBX Intermediates: ref=%0.2f, outdiv=%f, fbdiv=%f") % (ref_freq*(1+int(D))/(R*(1+int(T)))) % double(RFdiv*2) % double(N + double(FRAC)/double(MOD)) << std::endl
-
-        << boost::format("WBX tune: R=%d, BS=%d, N=%d, FRAC=%d, MOD=%d, T=%d, D=%d, RFdiv=%d"
-            ) % R % BS % N % FRAC % MOD % T % D % RFdiv << std::endl
-        << boost::format("WBX Frequencies (MHz): REQ=%0.2f, ACT=%0.2f, VCO=%0.2f, PFD=%0.2f, BAND=%0.2f"
-            ) % (target_freq/1e6) % (actual_freq/1e6) % (vco_freq/1e6) % (pfd_freq/1e6) % (pfd_freq/BS/1e6) << std::endl;
+    adf4351_regs_t::prescaler_t prescaler = target_freq > 3e9 ? adf4351_regs_t::PRESCALER_8_9 : adf4351_regs_t::PRESCALER_4_5;
+    
+    adf435x_tuning_constraints tuning_constraints;
+    tuning_constraints.force_frac0 = is_int_n;
+    tuning_constraints.band_sel_freq_max = 100e3;
+    tuning_constraints.ref_doubler_threshold = 12.5e6;
+    tuning_constraints.int_range = uhd::range_t(prescaler_to_min_int_div[prescaler], 4095);
+    tuning_constraints.pfd_freq_max = 25e6;
+    tuning_constraints.rf_divider_range = uhd::range_t(1, 64);
+
+    double actual_freq;
+    adf435x_tuning_settings tuning_settings = tune_adf435x_synth(
+        target_freq, self_base->get_iface()->get_clock_rate(unit),
+        tuning_constraints, actual_freq);
 
     //load the register values
     adf4351_regs_t regs;
 
-    regs.frac_12_bit = FRAC;
-    regs.int_16_bit = N;
-    regs.mod_12_bit = MOD;
-    if (do_sync)
-    {
-        regs.clock_divider_12_bit = std::max(1, int(std::ceil(400e-6*pfd_freq/MOD)));
-        regs.feedback_select = adf4351_regs_t::FEEDBACK_SELECT_DIVIDED;
-        regs.clock_div_mode = adf4351_regs_t::CLOCK_DIV_MODE_RESYNC_ENABLE;
-    }
-    regs.prescaler = prescaler;
-    regs.r_counter_10_bit = R;
-    regs.reference_divide_by_2 = T;
-    regs.reference_doubler = D;
-    regs.band_select_clock_div = BS;
-    UHD_ASSERT_THROW(rfdivsel_to_enum.has_key(RFdiv));
-    regs.rf_divider_select = rfdivsel_to_enum[RFdiv];
-
-    if (unit == dboard_iface::UNIT_RX) {
-        freq_range_t rx_lo_5dbm = list_of
-            (range_t(0.05e9, 1.4e9))
-        ;
-
-        freq_range_t rx_lo_2dbm = list_of
-            (range_t(1.4e9, 2.2e9))
-        ;
-
-        if (actual_freq == rx_lo_5dbm.clip(actual_freq)) regs.output_power = adf4351_regs_t::OUTPUT_POWER_5DBM;
-
-        if (actual_freq == rx_lo_2dbm.clip(actual_freq)) regs.output_power = adf4351_regs_t::OUTPUT_POWER_2DBM;
-
-    } else if (unit == dboard_iface::UNIT_TX) {
-        freq_range_t tx_lo_5dbm = list_of
-            (range_t(0.05e9, 1.7e9))
-            (range_t(1.9e9, 2.2e9))
-        ;
-
-        freq_range_t tx_lo_m1dbm = list_of
-            (range_t(1.7e9, 1.9e9))
-        ;
-
-        if (actual_freq == tx_lo_5dbm.clip(actual_freq)) regs.output_power = adf4351_regs_t::OUTPUT_POWER_5DBM;
-
-        if (actual_freq == tx_lo_m1dbm.clip(actual_freq)) regs.output_power = adf4351_regs_t::OUTPUT_POWER_M1DBM;
-
-    }
+    if (unit == dboard_iface::UNIT_RX)
+        regs.output_power = (actual_freq == wbx_rx_lo_5dbm.clip(actual_freq)) ? adf4351_regs_t::OUTPUT_POWER_5DBM
+                                                                              : adf4351_regs_t::OUTPUT_POWER_2DBM;
+    else
+        regs.output_power = (actual_freq == wbx_tx_lo_5dbm.clip(actual_freq)) ? adf4351_regs_t::OUTPUT_POWER_5DBM
+                                                                              : adf4351_regs_t::OUTPUT_POWER_M1DBM;
+
+    regs.frac_12_bit            = tuning_settings.frac_12_bit;
+    regs.int_16_bit             = tuning_settings.int_16_bit;
+    regs.mod_12_bit             = tuning_settings.mod_12_bit;
+    regs.clock_divider_12_bit   = tuning_settings.clock_divider_12_bit;
+    regs.feedback_select        = tuning_settings.feedback_after_divider ?
+                                    adf4351_regs_t::FEEDBACK_SELECT_DIVIDED :
+                                    adf4351_regs_t::FEEDBACK_SELECT_FUNDAMENTAL;
+    regs.clock_div_mode         = adf4351_regs_t::CLOCK_DIV_MODE_RESYNC_ENABLE;
+    regs.prescaler              = prescaler;
+    regs.r_counter_10_bit       = tuning_settings.r_counter_10_bit;
+    regs.reference_divide_by_2  = tuning_settings.r_divide_by_2_en ?
+                                    adf4351_regs_t::REFERENCE_DIVIDE_BY_2_ENABLED :
+                                    adf4351_regs_t::REFERENCE_DIVIDE_BY_2_DISABLED;
+    regs.reference_doubler      = tuning_settings.r_doubler_en ?
+                                    adf4351_regs_t::REFERENCE_DOUBLER_ENABLED :
+                                    adf4351_regs_t::REFERENCE_DOUBLER_DISABLED;
+    regs.band_select_clock_div  = tuning_settings.band_select_clock_div;
+    UHD_ASSERT_THROW(rfdivsel_to_enum.has_key(tuning_settings.rf_divider));
+    regs.rf_divider_select      = rfdivsel_to_enum[tuning_settings.rf_divider];
+    regs.ldf                    = is_int_n ?
+                                    adf4351_regs_t::LDF_INT_N :
+                                    adf4351_regs_t::LDF_FRAC_N;
 
     //reset the N and R counter
     regs.counter_reset = adf4351_regs_t::COUNTER_RESET_ENABLED;
@@ -361,10 +291,12 @@ double wbx_base::wbx_version4::set_lo_freq(dboard_iface::unit_t unit, double tar
     //correct power-up sequence to write registers (5, 4, 3, 2, 1, 0)
     int addr;
 
+    boost::uint16_t rx_id = self_base->get_rx_id().to_uint16();
+    std::string board_name = (rx_id == 0x0081) ? "WBX-120" : "WBX";
     for(addr=5; addr>=0; addr--){
         UHD_LOGV(often) << boost::format(
-            "WBX SPI Reg (0x%02x): 0x%08x"
-        ) % addr % regs.get_reg(addr) << std::endl;
+            "%s SPI Reg (0x%02x): 0x%08x"
+        ) % board_name.c_str() % addr % regs.get_reg(addr) << std::endl;
         self_base->get_iface()->write_spi(
             unit, spi_config_t::EDGE_RISE,
             regs.get_reg(addr), 32
@@ -373,7 +305,7 @@ double wbx_base::wbx_version4::set_lo_freq(dboard_iface::unit_t unit, double tar
 
     //return the actual frequency
     UHD_LOGV(often) << boost::format(
-        "WBX tune: actual frequency %f Mhz"
-    ) % (actual_freq/1e6) << std::endl;
+        "%s tune: actual frequency %f Mhz"
+    ) % board_name.c_str() % (actual_freq/1e6) << std::endl;
     return actual_freq;
 }