src/e_aux.h

   1 /*$Id: e_aux.h,v 1.1 2009-10-23 12:01:45 felix Exp $ -*- C++ -*-
   2  * Copyright (C) 2001 Albert Davis
   3  * Author: Albert Davis <aldavis@gnu.org>
   4  *
   5  * This file is part of "Gnucap", the Gnu Circuit Analysis Package
   6  *
   7  * This program is free software; you can redistribute it and/or modify
   8  * it under the terms of the GNU General Public License as published by
   9  * the Free Software Foundation; either version 3, or (at your option)
  10  * any later version.
  11  *
  12  * This program is distributed in the hope that it will be useful,
  13  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15  * GNU General Public License for more details.
  16  *
  17  * You should have received a copy of the GNU General Public License
  18  * along with this program; if not, write to the Free Software
  19  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
  20  * 02110-1301, USA.
  21  *------------------------------------------------------------------
  22  * helper functions, etc., that sort of belong to circuit elements
  23  */
  24 //testing=script 2007.07.13
  25 #ifndef E_AUX_H
  26 #define E_AUX_H
  27 #include "e_node.h"
  28 #include "u_status.h"
  29 /*--------------------------------------------------------------------------*/
  30 template <class T>
  31 T port_impedance(const node_t& n1, const node_t& n2,
  32                  BSMATRIX<T>& mat, const T& parallel)
  33 {
  34   T* zapit = new T[mat.size()+2];
  35
  36   for (unsigned ii = 0;  ii < mat.size()+2;  ++ii) {
  37     zapit[ii] = 0.;
  38   }
  39   if (n1.m_() != 0) {
  40     zapit[n1.m_()] =  1.;
  41   }else{untested();
  42   }
  43   if (n2.m_() != 0) {untested();
  44     zapit[n2.m_()] = -1.;
  45   }else{
  46   }
  47
  48   mat.fbsub(zapit);
  49   T raw_z = zapit[n1.m_()] - zapit[n2.m_()];
  50   delete [] zapit;
  51   return (parallel != 0.)
  52     ? 1. / ((1./raw_z)-parallel)
  53     : raw_z;
  54 }
  55 /*--------------------------------------------------------------------------*/
  56 inline void set_sens_port(const node_t& n1, const node_t& n2)
  57 {
  58   std::fill_n(CKT_BASE::_sim->_sens, 1*CKT_BASE::_sim->_total_nodes+1, 0);
  59   CKT_BASE::_sim->_sens[n1.m_()] = 1;
  60   if(n2.m_()){
  61     CKT_BASE::_sim->_sens[n2.m_()] = -1;
  62   } else {
  63     // weird, _sens[0] shouldnt do anything
  64   }
  65 }
  66 /*--------------------------------------------------------------------------*/
  67 inline COMPLEX port_noise(const node_t& n1, const node_t& n2){
  68   set_sens_port(n1,n2);
  69   ::status.back.start();
  70   CKT_BASE::_sim->_acx.fbsubt(CKT_BASE::_sim->_sens);
  71   ::status.back.stop();
  72   double a = CARD_LIST::card_list.do_noise();
  73   return a;
  74 }
  75 /*--------------------------------------------------------------------------*/
  76 /*--------------------------------------------------------------------------*/
  77 #endif
  78 // vim:ts=8:sw=2:noet: