Qucs-core  0.0.19
ipulse.cpp
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00001 /*
00002  * ipulse.cpp - pulse current source class implementation
00003  *
00004  * Copyright (C) 2004, 2006, 2008 Stefan Jahn <stefan@lkcc.org>
00005  *
00006  * This is free software; you can redistribute it and/or modify
00007  * it under the terms of the GNU General Public License as published by
00008  * the Free Software Foundation; either version 2, or (at your option)
00009  * any later version.
00010  *
00011  * This software is distributed in the hope that it will be useful,
00012  * but WITHOUT ANY WARRANTY; without even the implied warranty of
00013  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
00014  * GNU General Public License for more details.
00015  *
00016  * You should have received a copy of the GNU General Public License
00017  * along with this package; see the file COPYING.  If not, write to
00018  * the Free Software Foundation, Inc., 51 Franklin Street - Fifth Floor,
00019  * Boston, MA 02110-1301, USA.
00020  *
00021  * $Id$
00022  *
00023  */
00024 
00025 #if HAVE_CONFIG_H
00026 # include <config.h>
00027 #endif
00028 
00029 #include "component.h"
00030 #include "ipulse.h"
00031 
00032 using namespace qucs;
00033 
00034 ipulse::ipulse () : circuit (2) {
00035   type = CIR_IPULSE;
00036   setISource (true);
00037 }
00038 
00039 void ipulse::initSP (void) {
00040   allocMatrixS ();
00041   setS (NODE_1, NODE_1, 1.0);
00042   setS (NODE_1, NODE_2, 0.0);
00043   setS (NODE_2, NODE_1, 0.0);
00044   setS (NODE_2, NODE_2, 1.0);
00045 }
00046 
00047 void ipulse::initDC (void) {
00048   nr_double_t i = getPropertyDouble ("I1");
00049   allocMatrixMNA ();
00050   setI (NODE_1, +i); setI (NODE_2, -i);
00051 }
00052 
00053 void ipulse::initAC (void) {
00054   allocMatrixMNA ();
00055   clearI ();
00056 }
00057 
00058 void ipulse::initTR (void) {
00059   initDC ();
00060 }
00061 
00062 void ipulse::calcTR (nr_double_t t) {
00063   nr_double_t i1 = getPropertyDouble ("I1");
00064   nr_double_t i2 = getPropertyDouble ("I2");
00065   nr_double_t t1 = getPropertyDouble ("T1");
00066   nr_double_t t2 = getPropertyDouble ("T2");
00067   nr_double_t tr = getPropertyDouble ("Tr");
00068   nr_double_t tf = getPropertyDouble ("Tf");
00069   nr_double_t it = 0;
00070   nr_double_t s  = getNet()->getSrcFactor ();
00071 
00072   if (t < t1) { // before pulse
00073     it = i1;
00074   }
00075   else if (t >= t1 && t < t1 + tr) { // rising edge
00076     it = i1 + (i2 - i1) / tr * (t - t1);
00077   }
00078   else if (t >= t1 + tr && t < t2 - tf) { // during full pulse
00079     it = i2;
00080   }
00081   else if (t >= t2 - tf && t < t2) { // falling edge
00082     it = i2 + (i1 - i2) / tf * (t - (t2 - tf));
00083   }
00084   else { // after pulse
00085     it = i1;
00086   }
00087   setI (NODE_1, +it * s); setI (NODE_2, -it * s);
00088 }
00089 
00090 // properties
00091 PROP_REQ [] = {
00092   { "I1", PROP_REAL, { 0, PROP_NO_STR }, PROP_NO_RANGE },
00093   { "I2", PROP_REAL, { 1, PROP_NO_STR }, PROP_NO_RANGE },
00094   { "T1", PROP_REAL, { 0, PROP_NO_STR }, PROP_POS_RANGE },
00095   { "T2", PROP_REAL, { 1e-3, PROP_NO_STR }, PROP_POS_RANGE },
00096   PROP_NO_PROP };
00097 PROP_OPT [] = {
00098   { "Tr", PROP_REAL, { 1e-9, PROP_NO_STR }, PROP_POS_RANGE },
00099   { "Tf", PROP_REAL, { 1e-9, PROP_NO_STR }, PROP_POS_RANGE },
00100   PROP_NO_PROP };
00101 struct define_t ipulse::cirdef =
00102   { "Ipulse", 2, PROP_COMPONENT, PROP_NO_SUBSTRATE, PROP_LINEAR, PROP_DEF };