1 files changed, 75 insertions, 0 deletions
diff --git a/src/electronics/simulation/bjt.h b/src/electronics/simulation/bjt.h
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+/***************************************************************************
+ *   Copyright (C) 2003-2005 by David Saxton                               *
+ *   [email protected]                                                    *
+ *                                                                         *
+ *   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
+*/
+class BJT : public NonLinear
+{
+	public:
+		BJT( bool isNPN );
+		virtual ~BJT();
+	
+		virtual Type type() const { return Element_BJT; }
+		virtual void update_dc();
+		virtual void add_initial_dc();
+		virtual void add_map();
+		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 );
+
+		BJTState m_os;
+		BJTState m_ns;
+		int m_pol;
+		double V_BE_prev, V_BC_prev;
+		BJTSettings m_bjtSettings;
+};
+
+#endif