Import vests testsuite

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diff --git a/testsuite/vests/vhdl-ams/ashenden/compliant/util/src_sine.vhd b/testsuite/vests/vhdl-ams/ashenden/compliant/util/src_sine.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 
+
+library IEEE;  use IEEE.MATH_REAL.all;
+library IEEE_proposed;  use IEEE_proposed.ELECTRICAL_SYSTEMS.all;
+
+entity src_sine is
+
+  generic ( freq : real;              -- frequency [Hertz]
+            amplitude : voltage;      -- amplitude [Volts]
+            phase : real := 0.0;      -- initial phase [Degrees]
+            offset : voltage := 0.0;  -- DC value [Volts]
+            df : real := 0.0;         -- damping factor [1/second]
+            ac_mag : voltage := 1.0;  -- AC magnitude [Volts]
+            ac_phase : real := 0.0);  -- AC phase [Degrees]
+
+  port ( quantity output : out real );
+
+end entity src_sine;
+
+
+architecture ideal of src_sine is
+  
+  -- Declare quantity for phase in radians (calculated below)
+  quantity phase_rad : real;
+  -- Declare quantity in frequency domain for AC analysis
+  quantity ac_spec : real spectrum ac_mag, math_2_pi * ac_phase / 360.0;
+
+begin
+  
+  -- Convert phase to radians
+  phase_rad == math_2_pi *(freq * now + phase / 360.0);
+
+  if domain = quiescent_domain or domain = time_domain use
+    output == offset + amplitude * sin(phase_rad) * exp(-now * df);
+  else
+    output == ac_spec;  -- used for Frequency (AC) analysis
+  end use;
+
+end architecture ideal;