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/***************************************************************************
* 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
*/
class NonLinear : public Element
{
public:
NonLinear();
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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