kicad/pcb_calculator/attenuators/attenuator_classes.cpp

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/****************************************************************************
** From Qucs Attenuator Synthesis
** attenuator_classes.cpp
**
** since 2006/6/14
**
*****************************************************************************/
#include <math.h>
#include "attenuator_classes.h"
// Bitmaps:
#include "att_pi.xpm"
#include "att_tee.xpm"
#include "att_bridge.xpm"
#include "att_splitter.xpm"
#include "pi_formula.xpm"
#include "tee_formula.xpm"
#include "bridged_tee_formula.xpm"
#include "splitter_formula.xpm"
#ifndef NULL
#define NULL 0
#endif
ATTENUATOR::ATTENUATOR( ATTENUATORS_TYPE aTopology )
{
m_Name = wxT("att_base");
m_Error = false;
m_Topology = aTopology;
m_ResultCount = 3; // If 3 values must be calculated
m_Zin = 50; // Ohms
m_Zin_Enable = true;
m_Zout = 50; // Ohms
m_Attenuation = 6.0; // dB
m_Attenuation_Enable = true;
m_MinimumATT = 0.0; // dB
m_SchBitMap = NULL;
m_FormulaBitMap = NULL;
}
ATTENUATOR::~ATTENUATOR()
{
delete m_SchBitMap;
delete m_FormulaBitMap;
}
#define KEYWORD_ATTENUATOR_ATT wxT( "Attenuation" )
#define KEYWORD_ATTENUATOR_ZIN wxT( "Zin" )
#define KEYWORD_ATTENUATOR_ZOUT wxT( "Zout" )
#define KEYWORD_ATTENUATORS wxT( "Attenuators/" )
void ATTENUATOR::ReadConfig( wxConfig* aConfig )
{
aConfig->SetPath( KEYWORD_ATTENUATORS + m_Name );
if( m_Attenuation_Enable )
aConfig->Read( KEYWORD_ATTENUATOR_ATT, &m_Attenuation, 6.0 );
aConfig->Read( KEYWORD_ATTENUATOR_ZIN, &m_Zin, 50.0 );
aConfig->Read( KEYWORD_ATTENUATOR_ZOUT, &m_Zout, 50.0 );
aConfig->SetPath( wxT( "../.." ) );
}
void ATTENUATOR::WriteConfig( wxConfig* aConfig )
{
aConfig->SetPath( KEYWORD_ATTENUATORS + m_Name );
aConfig->Write( KEYWORD_ATTENUATOR_ATT, m_Attenuation );
aConfig->Write( KEYWORD_ATTENUATOR_ZIN, m_Zin );
aConfig->Write( KEYWORD_ATTENUATOR_ZOUT, m_Zout );
aConfig->SetPath( wxT( "../.." ) );
}
ATTENUATOR_PI::ATTENUATOR_PI() : ATTENUATOR( PI_TYPE )
{
m_Name = wxT("att_pi");
m_SchBitMap = new wxBitmap( att_pi_xpm );
m_FormulaBitMap = new wxBitmap( pi_formula_xpm );
}
bool ATTENUATOR_PI::Calculate()
{
if( !ATTENUATOR::Calculate() )
return false;
m_R2 = ( (L - 1) / 2 ) * sqrt( m_Zin * m_Zout / L );
m_R1 = 1 / ( ( (A / m_Zin) ) - (1 / m_R2) );
m_R3 = 1 / ( ( (A / m_Zout) ) - (1 / m_R2) );
return true;
}
ATTENUATOR_TEE::ATTENUATOR_TEE() : ATTENUATOR( TEE_TYPE )
{
m_Name = wxT("att_tee");
m_SchBitMap = new wxBitmap( att_tee_xpm );
m_FormulaBitMap = new wxBitmap( tee_formula_xpm );
}
bool ATTENUATOR_TEE::Calculate()
{
if( !ATTENUATOR::Calculate() )
return false;
m_R2 = ( 2 * sqrt( L * m_Zin * m_Zout ) ) / (L - 1);
m_R1 = m_Zin * A - m_R2;
m_R3 = m_Zout * A - m_R2;
return true;
}
ATTENUATOR_BRIDGE::ATTENUATOR_BRIDGE() : ATTENUATOR( BRIDGE_TYPE )
{
m_Name = wxT("att_bridge");
m_Zin_Enable = false;
m_ResultCount = 2;
m_SchBitMap = new wxBitmap( att_bridge_xpm );
m_FormulaBitMap = new wxBitmap( bridged_tee_formula_xpm );
}
bool ATTENUATOR_BRIDGE::Calculate()
{
m_Zin = m_Zout;
if( !ATTENUATOR::Calculate() )
return false;
L = pow( 10, m_Attenuation / 20 );
m_R1 = m_Zin * (L - 1);
m_R2 = m_Zin / (L - 1);
return true;
}
ATTENUATOR_SPLITTER::ATTENUATOR_SPLITTER() : ATTENUATOR( SPLITTER_TYPE )
{
m_Name = wxT("att_splitter");
m_Attenuation_Enable = false;
m_Attenuation = 6.0;
m_MinimumATT = 6.0;
m_Zin_Enable = false;
m_SchBitMap = new wxBitmap( att_splitter_xpm );
m_FormulaBitMap = new wxBitmap( splitter_formula_xpm );
}
bool ATTENUATOR_SPLITTER::Calculate()
{
m_Attenuation = 6.0;
m_Zin = m_Zout;
m_R1 = m_R2 = m_R3 = m_Zout / 3.0;
return true;
}
bool ATTENUATOR::Calculate()
{
L = pow( 10, m_Attenuation / 10 );
A = (L + 1) / (L - 1);
if( m_Zin > m_Zout )
{
Lmin = (2 * m_Zin / m_Zout) - 1 + 2 *
sqrt( m_Zin / m_Zout * (m_Zin / m_Zout - 1) );
}
else
{
Lmin = (2 * m_Zout / m_Zin) - 1 + 2 *
sqrt( m_Zout / m_Zin * (m_Zout / m_Zin - 1) );
}
m_MinimumATT = 10 * log10( Lmin );
if( m_MinimumATT > m_Attenuation )
{
m_Error = true;
return false;
}
m_Error = false;
return true;
}