Import vests testsuite

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diff --git a/testsuite/vests/vhdl-ams/ashenden/compliant/util/src_constant.vhd b/testsuite/vests/vhdl-ams/ashenden/compliant/util/src_constant.vhd
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+
+-- Copyright (C) 2002 Morgan Kaufmann Publishers, Inc
+
+-- This file is part of VESTs (Vhdl tESTs).
+
+-- VESTs 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. 
+
+-- VESTs 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 VESTs; if not, write to the Free Software Foundation,
+-- Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA 
+
+-- Voltage Pulse Source (Includes Frequency Domain settings)
+
+library ieee;  use ieee.math_real.all;
+library ieee_proposed;  use ieee_proposed.electrical_systems.all;
+
+entity src_constant is
+  
+  generic ( level : real := 1.0;       -- Constant output value (V)
+            ac_mag : real := 1.0;      -- AC magnitude 
+            ac_phase : real := 0.0 );  -- AC phase (degrees)
+
+  port ( quantity output : out real );
+
+end entity src_constant;
+
+
+architecture ideal of src_constant is
+
+  -- Declare quantity in frequency domain for AC analysis 
+  quantity ac_spec : real spectrum ac_mag, math_2_pi * ac_phase / 360.0;
+
+begin
+
+  if domain = quiescent_domain or domain = time_domain use
+    output == level;
+  else	
+    output == ac_spec;  -- used for frequency (AC) analysis
+  end use;
+
+end architecture ideal;