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diff --git a/testsuite/vests/vhdl-ams/ashenden/compliant/analog-modeling/control_system.vhd b/testsuite/vests/vhdl-ams/ashenden/compliant/analog-modeling/control_system.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_proposed;  use ieee_proposed.electrical_systems.all;
+
+entity control_system is
+  port ( quantity feedback, target : in voltage;
+         quantity output : out voltage );
+end entity control_system;
+
+----------------------------------------------------------------
+
+architecture simple_feedback of control_system is
+  constant gain : real := 2.0;
+begin
+  output == gain * ( target - feedback );
+end architecture simple_feedback;