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diff --git a/fpga/usrp3/lib/dsp/add2.v b/fpga/usrp3/lib/dsp/add2.v
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+++ b/fpga/usrp3/lib/dsp/add2.v
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+//
+// Copyright 2011 Ettus Research LLC
+// Copyright 2018 Ettus Research, a National Instruments Company
+//
+// SPDX-License-Identifier: LGPL-3.0-or-later
+//
+
+
+
+module add2
+  #(parameter WIDTH=16)
+    (input [WIDTH-1:0] in1,
+     input [WIDTH-1:0] in2,
+     output [WIDTH-1:0] sum);
+
+   wire [WIDTH:0] 	sum_int = {in1[WIDTH-1],in1} + {in2[WIDTH-1],in2};
+   assign 		sum = sum_int[WIDTH:1];  // Note -- will have some bias
+   
+endmodule // add2