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49 lines
1.6 KiB
49 lines
1.6 KiB
/***************************************************************************
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* Copyright (C) 2003-2005 by David Saxton *
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* david@bluehaze.org *
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* *
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* This program is free software; you can redistribute it and/or modify *
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* it under the terms of the GNU General Public License as published by *
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* the Free Software Foundation; either version 2 of the License, or *
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* (at your option) any later version. *
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***************************************************************************/
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#ifndef NONLINEAR_H
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#define NONLINEAR_H
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#include "element.h"
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/**
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@short Represents a non-linear circuit element (such as a diode)
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@author David Saxton
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*/
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class NonLinear : public Element
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{
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public:
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NonLinear();
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virtual bool isNonLinear() { return true; }
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/**
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* Newton-Raphson iteration: Update equation system.
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*/
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virtual void update_dc() = 0;
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protected:
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double diodeCurrent( double v, double I_S, double Vte ) const;
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/**
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* Conductance of the diode - the derivative of Schockley's
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* approximation.
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*/
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double diodeConductance( double v, double I_S, double Vte ) const;
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/**
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* Limits the diode voltage to prevent divergence in the nonlinear
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* iterations.
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*/
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double diodeVoltage( double v, double V_prev, double Vt, double V_crit ) const;
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void diodeJunction( double v, double I_S, double Vte, double * I, double * g ) const;
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double diodeCriticalVoltage( double I_S, double Vte ) const;
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};
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#endif
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