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nonlinear.h

/***************************************************************************
 *   Copyright (C) 2003-2005 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.                                   *
 ***************************************************************************/

#ifndef NONLINEAR_H
#define NONLINEAR_H

#include "element.h"

/**
@short Represents a non-linear circuit element (such as a diode)
@author David Saxton
*/
00020 class NonLinear : public Element
{
      public:
            NonLinear();
      
00025             virtual bool isNonLinear() { return true; }
            /**
             * Newton-Raphson iteration: Update equation system.
             */
            virtual void update_dc() = 0;
            
      protected:
            double diodeCurrent( double v, double I_S, double Vte ) const;
            /**
             * Conductance of the diode - the derivative of Schockley's
             * approximation.
             */
            double diodeConductance( double v, double I_S, double Vte ) const;
            /**
             * Limits the diode voltage to prevent divergence in the nonlinear
             * iterations.
             */
            double diodeVoltage( double v, double V_prev, double Vt, double V_crit ) const;
            void diodeJunction( double v, double I_S, double Vte, double * I, double * g ) const;
            
            double diodeCriticalVoltage( double I_S, double Vte ) const;
};

#endif

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