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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 inline_12a is
+
+end entity inline_12a;
+
+
+architecture test of inline_12a is
+
+  -- code from book
+
+  type biases is (forward, reverse);
+  type regions is (cutoff, saturation, linear);
+  
+  signal bias : biases;
+  signal region : regions;
+
+  -- end code from book
+
+  constant threshold_voltage : voltage := 0.6;
+  constant k : real := 0.0125;
+  terminal gate, source, drain : electrical;
+  quantity vds across ids through drain to source;
+  quantity vsd across source to drain;
+  quantity vgs across gate to source;
+  quantity vgd across gate to drain;
+  
+begin
+
+  -- code from book
+
+  case bias use
+    when forward =>
+      case region use
+        when cutoff =>
+          ids == 0.0;
+        when saturation =>
+          ids == 0.5 * k * (vgs - threshold_voltage)**2;
+        when linear =>
+          ids == k * (vgs - threshold_voltage - 0.5*vds) * vds;
+      end case;
+    when reverse =>
+      case region use
+        when cutoff =>
+          ids == 0.0;
+        when saturation =>
+          ids == -0.5 * k * (vgd - threshold_voltage)**2;
+        when linear =>
+          ids == -k * (vgd - threshold_voltage - 0.5*vsd) * vsd;
+      end case;
+  end case;
+
+  -- end code from book
+
+end architecture test;