diff options
Diffstat (limited to 'usrp2')
| -rw-r--r-- | usrp2/sdr_lib/tx_dcoffset.v | 26 | ||||
| -rw-r--r-- | usrp2/sdr_lib/tx_frontend.v | 39 |
2 files changed, 35 insertions, 30 deletions
diff --git a/usrp2/sdr_lib/tx_dcoffset.v b/usrp2/sdr_lib/tx_dcoffset.v deleted file mode 100644 index 737693611..000000000 --- a/usrp2/sdr_lib/tx_dcoffset.v +++ /dev/null @@ -1,26 +0,0 @@ - -// TX DC offset. Setting is 8 fractional bits, 8 integer bits - -module tx_dcoffset - #(parameter WIDTH_IN=16, - parameter WIDTH_OUT=16, - parameter ADDR=8'd0) - (input clk, input rst, - input set_stb, input [7:0] set_addr, input [31:0] set_data, - input [WIDTH_IN-1:0] in, output [WIDTH_OUT-1:0] out); - - wire [15:0] dco; - wire [WIDTH_IN+8-1:0] dco_ext, sum; - - setting_reg #(.my_addr(ADDR),.width(16)) sr_0 - (.clk(clk),.rst(rst),.strobe(set_stb),.addr(set_addr),.in(set_data),.out(dco)); - - sign_extend #(.bits_in(16),.bits_out(WIDTH_IN+8)) ext_err (.in(dco), .out(dco_ext)); - - add2_and_clip_reg #(.WIDTH(WIDTH_IN+8)) add2_and_clip_reg - (.clk(clk), .rst(rst), .in1({in,8'd0}), .in2(dco_ext), .strobe_in(1'b1), .sum(sum), .strobe_out()); - - round_sd #(.WIDTH_IN(WIDTH_IN+8),.WIDTH_OUT(WIDTH_OUT)) round_sd - (.clk(clk), .reset(rst), .in(sum), .strobe_in(1'b1), .out(out), .strobe_out()); - -endmodule // rx_dcoffset diff --git a/usrp2/sdr_lib/tx_frontend.v b/usrp2/sdr_lib/tx_frontend.v index 2817c1510..82476ad0d 100644 --- a/usrp2/sdr_lib/tx_frontend.v +++ b/usrp2/sdr_lib/tx_frontend.v @@ -12,6 +12,9 @@ module tx_frontend wire [23:0] i_dco, q_dco, i_ofs, q_ofs; wire [15:0] i_final, q_final; wire [7:0] mux_ctrl; + wire [35:0] corr_i, corr_q; + wire [23:0] i_bal, q_bal; + wire [17:0] mag_corr, phase_corr; setting_reg #(.my_addr(BASE+0), .width(24)) sr_0 (.clk(clk),.rst(rst),.strobe(set_stb),.addr(set_addr), @@ -21,22 +24,50 @@ module tx_frontend (.clk(clk),.rst(rst),.strobe(set_stb),.addr(set_addr), .in(set_data),.out(q_dco),.changed()); - setting_reg #(.my_addr(BASE+2), .width(4)) sr_2 + setting_reg #(.my_addr(BASE+2),.width(18)) sr_2 + (.clk(clk),.rst(rst),.strobe(set_stb),.addr(set_addr), + .in(set_data),.out(mag_corr),.changed()); + + setting_reg #(.my_addr(BASE+3),.width(18)) sr_3 + (.clk(clk),.rst(rst),.strobe(set_stb),.addr(set_addr), + .in(set_data),.out(phase_corr),.changed()); + + setting_reg #(.my_addr(BASE+4), .width(8)) sr_4 (.clk(clk),.rst(rst),.strobe(set_stb),.addr(set_addr), .in(set_data),.out(mux_ctrl),.changed()); + // IQ Balance + MULT18X18S mult_mag_corr + (.P(corr_i), .A(tx_i[23:6]), .B(mag_corr), .C(clk), .CE(1), .R(rst) ); + + MULT18X18S mult_phase_corr + (.P(corr_q), .A(tx_i[23:6]), .B(phase_corr), .C(clk), .CE(1), .R(rst) ); + + add2_and_clip_reg #(.WIDTH(24)) add_clip_i + (.clk(clk), .rst(rst), + .in1(tx_i), .in2({{4{corr_i[35]}},corr_i[35:16]}), .strobe_in(1'b1), + .sum(i_bal), .strobe_out()); + + add2_and_clip_reg #(.WIDTH(24)) add_clip_q + (.clk(clk), .rst(rst), + .in1(tx_q), .in2({{4{corr_q[35]}},corr_q[35:16]}), .strobe_in(1'b1), + .sum(q_bal), .strobe_out()); + + // DC Offset add2_and_clip_reg #(.WIDTH(24)) add_dco_i - (.clk(clk), .rst(rst), .in1(i_dco), .in2(tx_i), .strobe_in(1'b1), .sum(i_ofs), .strobe_out()); + (.clk(clk), .rst(rst), .in1(i_dco), .in2(i_bal), .strobe_in(1'b1), .sum(i_ofs), .strobe_out()); add2_and_clip_reg #(.WIDTH(24)) add_dco_q - (.clk(clk), .rst(rst), .in1(q_dco), .in2(tx_q), .strobe_in(1'b1), .sum(q_ofs), .strobe_out()); - + (.clk(clk), .rst(rst), .in1(q_dco), .in2(q_bal), .strobe_in(1'b1), .sum(q_ofs), .strobe_out()); + + // Rounding round_sd #(.WIDTH_IN(24),.WIDTH_OUT(16)) round_i (.clk(clk), .reset(rst), .in(i_ofs),.strobe_in(1'b1), .out(i_final), .strobe_out()); round_sd #(.WIDTH_IN(24),.WIDTH_OUT(16)) round_q (.clk(clk), .reset(rst), .in(q_ofs),.strobe_in(1'b1), .out(q_final), .strobe_out()); + // Mux always @(posedge clk) case(mux_ctrl[3:0]) 0 : dac_a <= i_final; |