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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;
+use ieee_proposed.thermal_systems.all;
+
+entity temperature_dependent_resistor is
+  port ( terminal n1, n2 : electrical;
+         quantity temp : in temperature );
+end entity temperature_dependent_resistor;
+
+architecture linear_approx of temperature_dependent_resistor is
+  constant resistance_at_0 : real := 1.0E6;
+  constant resistance_drop_per_kelvin : real := 100.0;
+  quantity resistance : real;
+  quantity V across I through n1 to n2;
+begin
+  resistance == resistance_at_0 - temp * resistance_drop_per_kelvin;
+  V == I * resistance;
+end architecture linear_approx;