1 files changed, 77 insertions, 0 deletions
diff --git a/src/electronics/simulation/opamp.cpp b/src/electronics/simulation/opamp.cpp
new file mode 100644
index 0000000..45fbf02
--- /dev/null
+++ b/src/electronics/simulation/opamp.cpp
@@ -0,0 +1,77 @@
+/***************************************************************************
+ *   Copyright (C) 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.                                   *
+ ***************************************************************************/
+
+#include "elementset.h"
+#include "matrix.h"
+#include "opamp.h"
+
+OpAmp::OpAmp()
+	: Element::Element()
+{
+	m_numCBranches = 1;
+	m_numCNodes = 3;
+}
+
+
+OpAmp::~OpAmp()
+{
+}
+
+
+void OpAmp::add_map()
+{
+	if (!b_status)
+		return;
+	
+	if ( !p_cnode[0]->isGround )
+	{
+		// Non-inverting input
+		p_A->setUse_c( p_cbranch[0]->n(), p_cnode[0]->n(), Map::et_constant, true );
+	}
+	
+	if ( !p_cnode[2]->isGround )
+	{
+		// Inverting input
+		p_A->setUse_c( p_cbranch[0]->n(), p_cnode[2]->n(), Map::et_constant, true );
+	}
+	
+	if ( !p_cnode[1]->isGround )
+	{
+		// Output
+		p_A->setUse_b( p_cnode[1]->n(), p_cbranch[0]->n(), Map::et_constant, true );
+	}
+}
+
+
+void OpAmp::add_initial_dc()
+{
+	if (!b_status)
+		return;
+	
+	// Non-inverting input
+	A_c( 0, 0 ) = 1;
+	
+	// Inverting input
+	A_c( 0, 2 ) = -1;
+	
+	// Output
+	A_b( 1, 0 ) = 1;
+}
+
+
+void OpAmp::updateCurrents()
+{
+	if (!b_status) return;
+	m_cnodeI[0] = m_cnodeI[2] = 0.0;
+	m_cnodeI[1] = p_cbranch[0]->i;
+}
+
+
+