Qucs-core  0.0.19
vexp.cpp
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00001 /*
00002  * vexp.cpp - exponential voltage source class implementation
00003  *
00004  * Copyright (C) 2007, 2008 Stefan Jahn <stefan@lkcc.org>
00005  * Copyright (C) 2007 Gunther Kraut <gn.kraut@t-online.de>
00006  *
00007  * This is free software; you can redistribute it and/or modify
00008  * it under the terms of the GNU General Public License as published by
00009  * the Free Software Foundation; either version 2, or (at your option)
00010  * any later version.
00011  *
00012  * This software is distributed in the hope that it will be useful,
00013  * but WITHOUT ANY WARRANTY; without even the implied warranty of
00014  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
00015  * GNU General Public License for more details.
00016  *
00017  * You should have received a copy of the GNU General Public License
00018  * along with this package; see the file COPYING.  If not, write to
00019  * the Free Software Foundation, Inc., 51 Franklin Street - Fifth Floor,
00020  * Boston, MA 02110-1301, USA.
00021  *
00022  * $Id$
00023  *
00024  */
00025 
00026 #if HAVE_CONFIG_H
00027 # include <config.h>
00028 #endif
00029 
00030 #include "component.h"
00031 #include "vexp.h"
00032 
00033 using namespace qucs;
00034 
00035 vexp::vexp () : circuit (2) {
00036   type = CIR_VEXP;
00037   setVSource (true);
00038   setVoltageSources (1);
00039 }
00040 
00041 void vexp::initSP (void) {
00042   allocMatrixS ();
00043   setS (NODE_1, NODE_1, 0.0);
00044   setS (NODE_1, NODE_2, 1.0);
00045   setS (NODE_2, NODE_1, 1.0);
00046   setS (NODE_2, NODE_2, 0.0);
00047 }
00048 
00049 void vexp::initDC (void) {
00050   allocMatrixMNA ();
00051   voltageSource (VSRC_1, NODE_1, NODE_2);
00052   setE (VSRC_1, getPropertyDouble ("U1"));
00053 }
00054 
00055 void vexp::initAC (void) {
00056   initDC ();
00057   setE (VSRC_1, 0);
00058 }
00059 
00060 void vexp::initTR (void) {
00061   initDC ();
00062 }
00063 
00064 void vexp::calcTR (nr_double_t t) {
00065   nr_double_t u1 = getPropertyDouble ("U1");
00066   nr_double_t u2 = getPropertyDouble ("U2");
00067   nr_double_t t1 = getPropertyDouble ("T1");
00068   nr_double_t t2 = getPropertyDouble ("T2");
00069   nr_double_t tr = getPropertyDouble ("Tr");
00070   nr_double_t tf = getPropertyDouble ("Tf");
00071   nr_double_t ut = 0;
00072   nr_double_t s  = getNet()->getSrcFactor ();
00073 
00074   if (t <= t1) { // before pulse
00075     ut = u1;
00076   }
00077   else if (t > t1 && t <= t2) { // rising edge
00078     ut = u1 + (u2 - u1) * (1 - std::exp (-(t - t1) / tr));
00079   }
00080   else { // falling edge
00081     ut += u1;
00082     ut += (u2 - u1) * (1 - std::exp (-(t - t1) / tr));
00083     ut -= (u2 - u1) * (1 - std::exp (-(t - t2) / tf));
00084   }
00085   setE (VSRC_1, ut * s);
00086 }
00087 
00088 // properties
00089 PROP_REQ [] = {
00090   { "U1", PROP_REAL, { 0, PROP_NO_STR }, PROP_NO_RANGE },
00091   { "U2", PROP_REAL, { 1, PROP_NO_STR }, PROP_NO_RANGE },
00092   { "T1", PROP_REAL, { 0, PROP_NO_STR }, PROP_POS_RANGE },
00093   { "T2", PROP_REAL, { 1e-3, PROP_NO_STR }, PROP_POS_RANGE },
00094   PROP_NO_PROP };
00095 PROP_OPT [] = {
00096   { "Tr", PROP_REAL, { 1e-9, PROP_NO_STR }, PROP_POS_RANGE },
00097   { "Tf", PROP_REAL, { 1e-9, PROP_NO_STR }, PROP_POS_RANGE },
00098   PROP_NO_PROP };
00099 struct define_t vexp::cirdef =
00100   { "Vexp", 2, PROP_COMPONENT, PROP_NO_SUBSTRATE, PROP_LINEAR, PROP_DEF };