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vccs.cpp

/***************************************************************************
 *   Copyright (C) 2003-2004 by David Saxton                               *
 *   david@bluehaze.org                                                    *
 *                                                                         *
 *   This program 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.                                   *
 ***************************************************************************/

#include "elementset.h"
#include "matrix.h"
#include "vccs.h"

VCCS::VCCS( const double gain )
      : Element::Element()
{
      m_g = gain;
      m_numCBranches = 1;
      m_numCNodes = 4;
}


VCCS::~VCCS()
{
}


void VCCS::setGain( const double g )
{
      if ( g == m_g ) return;
      
      if (p_eSet)
            p_eSet->setCacheInvalidated();
      
      // Remove old values
      m_g = -m_g;
      add_initial_dc();
      
      // Add new values
      m_g = g;
      add_initial_dc();
}

00045 void VCCS::add_initial_dc()
{
      if (!b_status)
            return;
      
      A_c( 0, 0 ) = +1.0;
      A_c( 0, 1 ) = -1.0;
      A_b( 3, 0 ) = +1.0;
      A_b( 2, 0 ) = -1.0;
      A_d( 0, 0 ) = -1.0 / m_g;
      
#if 0
      A_g( 2, 0 ) += m_g;
      A_g( 3, 0 ) -= m_g;
      A_g( 2, 1 ) -= m_g;
      A_g( 3, 1 ) += m_g;
#endif
}


00065 void VCCS::updateCurrents()
{
      if (!b_status)
            return;
      
      m_cnodeI[0] = m_cnodeI[1] = 0.;
      m_cnodeI[3] = (p_cnode[0]->v-p_cnode[1]->v)*m_g;
      m_cnodeI[2] = -m_cnodeI[3];
}



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