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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_11a is
+
+end entity inline_11a;
+
+
+architecture test of inline_11a is
+
+ constant v_pos : voltage := 15.0;
+ constant v_neg : voltage := -15.0;
+ terminal input : electrical;
+ quantity v_in across input;
+ quantity v_amplified : voltage;
+ constant gain : real := 1.0;
+
+ 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;
+
+ constant r_charge : resistance := 10_000.0;
+ constant r_discharge : resistance := 10_000.0;
+ constant charging : boolean := true;
+ terminal cap, plus, minus : electrical;
+ quantity v_plus := 10.0 across plus;
+ quantity v_minus := 0.0 across minus;
+ quantity v_cap across cap;
+ quantity i_charge through plus to cap;
+ quantity i_discharge through cap to minus;
+
+begin
+
+ -- code from book
+
+ if v_in * gain > v_pos use -- incorrect
+ v_amplified == v_pos;
+ elsif v_in * gain < v_neg use -- incorrect
+ v_amplified == v_neg;
+ else
+ v_amplified == gain * v_in;
+ end use;
+
+ --
+
+ if vds'above(0.0) use -- transistor is forward biased
+ if not vgs'above(threshold_voltage) use -- cutoff region
+ ids == 0.0;
+ elsif vds'above(vgs - threshold_voltage) use -- saturation region
+ ids == 0.5 * k * (vgs - threshold_voltage)**2;
+ else -- linear/triode region
+ ids == k * (vgs - threshold_voltage - 0.5*vds) * vds;
+ end use;
+ else -- transistor is reverse biased
+ if not vgd 'above(threshold_voltage) use -- cutoff region
+ ids == 0.0;
+ elsif vsd'above(vgd - threshold_voltage) use -- saturation region
+ ids == -0.5 * k * (vgd - threshold_voltage)**2;
+ else -- linear/triode region
+ ids == -k * (vgd - threshold_voltage - 0.5*vsd) * vsd;
+ end use;
+ end use;
+
+ --
+
+ if charging use
+ i_charge == ( v_plus - v_cap ) / r_charge;
+ i_discharge == 0.0;
+ else
+ i_charge == 0.0;
+ i_discharge == ( v_cap - v_minus ) / r_discharge;
+ end use;
+
+ -- end code from book
+
+end architecture test;