Qucs-core  0.0.19
irect.cpp
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00001 /*
00002  * irect.cpp - rectangular 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 "irect.h"
00031 
00032 using namespace qucs;
00033 
00034 irect::irect () : circuit (2) {
00035   type = CIR_IRECT;
00036   setISource (true);
00037 }
00038 
00039 void irect::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 irect::initDC (void) {
00048   nr_double_t th = getPropertyDouble ("TH");
00049   nr_double_t tl = getPropertyDouble ("TL");
00050   nr_double_t tr = getPropertyDouble ("Tr");
00051   nr_double_t tf = getPropertyDouble ("Tf");
00052   if (tr > th) tr = th;
00053   if (tf > tl) tf = tl;
00054   nr_double_t a  = (th + (tf - tr) / 2) / (th + tl);
00055   nr_double_t i  = getPropertyDouble ("I") * a;
00056   allocMatrixMNA ();
00057   setI (NODE_1, +i); setI (NODE_2, -i);
00058 }
00059 
00060 void irect::initAC (void) {
00061   allocMatrixMNA ();
00062   clearI ();
00063 }
00064 
00065 void irect::initTR (void) {
00066   initDC ();
00067 }
00068 
00069 void irect::calcTR (nr_double_t t) {
00070   nr_double_t i  = getPropertyDouble ("I");
00071   nr_double_t th = getPropertyDouble ("TH");
00072   nr_double_t tl = getPropertyDouble ("TL");
00073   nr_double_t tr = getPropertyDouble ("Tr");
00074   nr_double_t tf = getPropertyDouble ("Tf");
00075   nr_double_t td = getPropertyDouble ("Td");
00076   nr_double_t it = 0;
00077   nr_double_t s  = getNet()->getSrcFactor ();
00078 
00079   if (tr > th) tr = th;
00080   if (tf > tl) tf = tl;
00081 
00082   if (t > td) { // after delay
00083     t = t - td;
00084     t = t - (th + tl) * qucs::floor (t / (th + tl));
00085     if (t < tr) { // rising edge
00086       it = + i / tr * t;
00087     }
00088     else if (t < th) { // high pulse
00089       it = i;
00090     }
00091     else if (t < th + tf) { // falling edge
00092       it = - i / tf * (t - (th + tf));
00093     }
00094   }
00095   setI (NODE_1, +it * s); setI (NODE_2, -it * s);
00096 }
00097 
00098 // properties
00099 PROP_REQ [] = {
00100   { "I", PROP_REAL, { 1e-3, PROP_NO_STR }, PROP_NO_RANGE },
00101   { "TH", PROP_REAL, { 1e-3, PROP_NO_STR }, PROP_POS_RANGE },
00102   { "TL", PROP_REAL, { 1e-3, PROP_NO_STR }, PROP_POS_RANGE },
00103   PROP_NO_PROP };
00104 PROP_OPT [] = {
00105   { "Tr", PROP_REAL, { 1e-9, PROP_NO_STR }, PROP_POS_RANGE },
00106   { "Tf", PROP_REAL, { 1e-9, PROP_NO_STR }, PROP_POS_RANGE },
00107   { "Td", PROP_REAL, { 0, PROP_NO_STR }, PROP_NO_RANGE },
00108   PROP_NO_PROP };
00109 struct define_t irect::cirdef =
00110   { "Irect", 2, PROP_COMPONENT, PROP_NO_SUBSTRATE, PROP_LINEAR, PROP_DEF };