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bjt.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 BJT_H
#define BJT_H

#include "matrix.h"
#include "nonlinear.h"

class BJTState
{
      public:
            BJTState();
            void reset();
            
            BJTState operator-( const BJTState & s ) const;
      
            double A[3][3];
            double I[3];
};


class BJTSettings
{
      public:
            BJTSettings();
            
            double I_S; ///< saturation current
            double N_F; ///< forward emission coefficient
            double N_R; ///< reverse emission coefficient
            double B_F; ///< forward beta
            double B_R; ///< reverse beta
};


/**
@author David Saxton
*/
00046 class BJT : public NonLinear
{
      public:
            BJT( bool isNPN );
            virtual ~BJT();
      
00052             virtual Type type() const { return Element_BJT; }
            virtual void update_dc();
            virtual void add_initial_dc();
            BJTSettings settings() const { return m_bjtSettings; }
            void setBJTSettings( const BJTSettings & settings );
      
      protected:
            virtual void updateCurrents();
            /**
             * Calculates the new BJTState from the voltages on the nodes.
             */
            void calc_eq();
            void calcIg( double V_BE, double V_BC,
                               double * I_BE, double * I_BC,
                               double * I_T,
                               double * g_BE, double * g_BC,
                               double * g_IF, double * g_IR ) const;
            void updateLim();

            BJTState m_os;
            BJTState m_ns;
            int m_pol;
            double V_BE_prev, V_BC_prev;
            double V_BE_lim, V_BC_lim;
            BJTSettings m_bjtSettings;
};

#endif

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