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diff --git a/sdr_lib/sign_extend.v b/sdr_lib/sign_extend.v
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+++ b/sdr_lib/sign_extend.v
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+// -*- verilog -*-
+//
+//  USRP - Universal Software Radio Peripheral
+//
+//  Copyright (C) 2003 Matt Ettus
+//
+//  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
+//  the Free Software Foundation; either version 2 of the License, or
+//  (at your option) any later version.
+//
+//  This program is distributed in the hope that it will be useful,
+//  but WITHOUT ANY WARRANTY; without even the implied warranty of
+//  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+//  GNU General Public License for more details.
+//
+//  You should have received a copy of the GNU General Public License
+//  along with this program; if not, write to the Free Software
+//  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+//
+
+
+// Sign extension "macro"
+// bits_out should be greater than bits_in
+
+module sign_extend (in,out);
+	parameter bits_in=0;  // FIXME Quartus insists on a default
+	parameter bits_out=0;
+	
+	input [bits_in-1:0] in;
+	output [bits_out-1:0] out;
+	
+	assign out = {{(bits_out-bits_in){in[bits_in-1]}},in};
+	
+endmodule