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kicad/pcb_calculator/transline/transline.cpp

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/*
* TRANSLINE.cpp - base for a transmission line implementation
*
* Copyright (C) 2005 Stefan Jahn <stefan@lkcc.org>
* Modified for Kicad: 2018 jean-pierre.charras
*
* 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.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this package; see the file COPYING. If not, write to
* the Free Software Foundation, Inc., 51 Franklin Street - Fifth Floor,
* Boston, MA 02110-1301, USA.
*
*/
#include <cmath>
#include <limits>
#include <transline.h>
#include <units.h>
#ifndef INFINITY
#define INFINITY std::numeric_limits<double>::infinity()
#endif
#ifndef M_PI_2
#define M_PI_2 ( M_PI / 2 )
#endif
// Functions to Read/Write parameters in pcb_calculator main frame:
// They are wrapper to actual functions, so all transline functions do not
// depend on Graphic User Interface
void SetPropertyInDialog( enum PRMS_ID aPrmId, double value );
/* Puts the text into the given result line.
*/
void SetResultInDialog( int line, const char* text );
/* print aValue into the given result line.
*/
void SetResultInDialog( int aLineNumber, double aValue, const char* aText );
/* Returns a named property value. */
double GetPropertyInDialog( enum PRMS_ID aPrmId );
// Returns true if the param aPrmId is selected
// Has meaning only for params that have a radio button
bool IsSelectedInDialog( enum PRMS_ID aPrmId );
/** Function SetPropertyBgColorInDialog
* Set the background color of a parameter
* @param aPrmId = param id to set
* @param aCol = new color
*/
void SetPropertyBgColorInDialog( enum PRMS_ID aPrmId, const KIGFX::COLOR4D* aCol );
/* Constructor creates a transmission line instance. */
TRANSLINE::TRANSLINE()
{
m_parameters[MURC_PRM] = 1.0;
m_Name = nullptr;
ang_l = 0.0; // Electrical length in angle
len = 0.0; // length of line
er_eff = 1.0; // effective dielectric constant
Init();
}
/* Destructor destroys a transmission line instance. */
TRANSLINE::~TRANSLINE()
{
}
void TRANSLINE::Init( void )
{
wxColour wxcol = wxSystemSettings::GetColour( wxSYS_COLOUR_WINDOW );
okCol = KIGFX::COLOR4D( wxcol );
okCol.r = wxcol.Red() / 255.0;
okCol.g = wxcol.Green() / 255.0;
okCol.b = wxcol.Blue() / 255.0;
int i;
// Initialize these variables mainly to avoid warnings from a static analyzer
for( i = 0; i < EXTRA_PRMS_COUNT; ++i )
{
m_parameters[i] = 0;
}
}
/* Sets a named property to the given value, access through the
* application.
*/
void TRANSLINE::setProperty( enum PRMS_ID aPrmId, double value )
{
SetPropertyInDialog( aPrmId, value );
}
/*
*Returns true if the param aPrmId is selected
* Has meaning only for params that have a radio button
*/
bool TRANSLINE::isSelected( enum PRMS_ID aPrmId )
{
return IsSelectedInDialog( aPrmId );
}
/* Puts the text into the given result line.
*/
void TRANSLINE::setResult( int line, const char* text )
{
SetResultInDialog( line, text );
}
void TRANSLINE::setResult( int line, double value, const char* text )
{
SetResultInDialog( line, value, text );
}
/* Returns a property value. */
double TRANSLINE::getProperty( enum PRMS_ID aPrmId )
{
return GetPropertyInDialog( aPrmId );
}
/** @function getProperties
*
* Get all properties from the UI. Computes some extra ones.
**/
void TRANSLINE::getProperties( void )
{
int i;
for( i = 0; i < DUMMY_PRM; ++i )
{
m_parameters[i] = getProperty( (PRMS_ID) i );
setErrorLevel( (PRMS_ID) i, TRANSLINE_OK );
}
m_parameters[SIGMA_PRM] = 1.0 / getProperty( RHO_PRM );
m_parameters[EPSILON_EFF_PRM] = 1.0;
m_parameters[SKIN_DEPTH_PRM] = skin_depth();
}
/** @function checkProperties
*
* Checks the input parameters (ie: negative length).
* Does not check for incompatibility between values as this depends on the line shape.
**/
void TRANSLINE::checkProperties( void )
{
// Do not check for values that are results of anylzing / synthesizing
// Do not check for transline specific incompatibilities ( like " conductor height sould be lesser than dielectric height")
if( !std::isfinite( m_parameters[EPSILONR_PRM] ) || m_parameters[EPSILONR_PRM] <= 0 )
setErrorLevel( EPSILONR_PRM, TRANSLINE_WARNING );
if( !std::isfinite( m_parameters[TAND_PRM] ) || m_parameters[TAND_PRM] < 0 )
setErrorLevel( TAND_PRM, TRANSLINE_WARNING );
if( !std::isfinite( m_parameters[RHO_PRM] ) || m_parameters[RHO_PRM] < 0 )
setErrorLevel( RHO_PRM, TRANSLINE_WARNING );
if( !std::isfinite( m_parameters[H_PRM] ) || m_parameters[H_PRM] < 0 )
setErrorLevel( H_PRM, TRANSLINE_WARNING );
if( !std::isfinite( m_parameters[TWISTEDPAIR_TWIST_PRM] )
|| m_parameters[TWISTEDPAIR_TWIST_PRM] < 0 )
setErrorLevel( TWISTEDPAIR_TWIST_PRM, TRANSLINE_WARNING );
if( !std::isfinite( m_parameters[STRIPLINE_A_PRM] ) || m_parameters[STRIPLINE_A_PRM] <= 0 )
setErrorLevel( STRIPLINE_A_PRM, TRANSLINE_WARNING );
if( !std::isfinite( m_parameters[H_T_PRM] ) || m_parameters[H_T_PRM] <= 0 )
setErrorLevel( H_T_PRM, TRANSLINE_WARNING );
// How can we check ROUGH_PRM ?
if( !std::isfinite( m_parameters[MUR_PRM] ) || m_parameters[MUR_PRM] < 0 )
setErrorLevel( MUR_PRM, TRANSLINE_WARNING );
if( !std::isfinite( m_parameters[TWISTEDPAIR_EPSILONR_ENV_PRM] )
|| m_parameters[TWISTEDPAIR_EPSILONR_ENV_PRM] <= 0 )
setErrorLevel( TWISTEDPAIR_EPSILONR_ENV_PRM, TRANSLINE_WARNING );
if( !std::isfinite( m_parameters[MURC_PRM] ) || m_parameters[MURC_PRM] < 0 )
setErrorLevel( MURC_PRM, TRANSLINE_WARNING );
if( !std::isfinite( m_parameters[FREQUENCY_PRM] ) || m_parameters[FREQUENCY_PRM] <= 0 )
setErrorLevel( FREQUENCY_PRM, TRANSLINE_WARNING );
}
void TRANSLINE::analyze()
{
getProperties();
checkProperties();
calcAnalyze();
showAnalyze();
show_results();
}
void TRANSLINE::synthesize()
{
getProperties();
checkProperties();
calcSynthesize();
showSynthesize();
show_results();
}
/**
* @function skin_depth
* calculate skin depth
*
* \f$ \frac{1}{\sqrt{ \pi \cdot f \cdot \mu \cdot \sigma }} \f$
*/
#include <cstdio>
double TRANSLINE::skin_depth()
{
double depth;
depth = 1.0
/ sqrt( M_PI * m_parameters[FREQUENCY_PRM] * m_parameters[MURC_PRM] * MU0
* m_parameters[SIGMA_PRM] );
return depth;
}
/* *****************************************************************
********** **********
********** mathematical functions **********
********** **********
***************************************************************** */
#define NR_EPSI 2.2204460492503131e-16
/* The function computes the complete elliptic integral of first kind
* K() and the second kind E() using the arithmetic-geometric mean
* algorithm (AGM) by Abramowitz and Stegun.
*/
void TRANSLINE::ellipke( double arg, double& k, double& e )
{
int iMax = 16;
if( arg == 1.0 )
{
k = INFINITY; // infinite
e = 0;
}
else if( std::isinf( arg ) && arg < 0 )
{
k = 0;
e = INFINITY; // infinite
}
else
{
double a, b, c, fr, s, fk = 1, fe = 1, t, da = arg;
int i;
if( arg < 0 )
{
fk = 1 / sqrt( 1 - arg );
fe = sqrt( 1 - arg );
da = -arg / ( 1 - arg );
}
a = 1;
b = sqrt( 1 - da );
c = sqrt( da );
fr = 0.5;
s = fr * c * c;
for( i = 0; i < iMax; i++ )
{
t = ( a + b ) / 2;
c = ( a - b ) / 2;
b = sqrt( a * b );
a = t;
fr *= 2;
s += fr * c * c;
if( c / a < NR_EPSI )
break;
}
if( i >= iMax )
{
k = 0;
e = 0;
}
else
{
k = M_PI_2 / a;
e = M_PI_2 * ( 1 - s ) / a;
if( arg < 0 )
{
k *= fk;
e *= fe;
}
}
}
}
/* We need to know only K(k), and if possible KISS. */
double TRANSLINE::ellipk( double k )
{
double r, lost;
ellipke( k, r, lost );
return r;
}
#define MAX_ERROR 0.000001
/**
* @function minimizeZ0Error1D
*
* Tries to find a parameter that minimizes the error ( on Z0 ).
* This function only works with a single parameter.
* Calls @ref calcAnalyze several times until the error is acceptable.
* While the error is unnacceptable, changes slightly the parameter.
*
* This function does not change Z0 / Angl_L.
*
* @param avar Parameter to synthesize
* @return 'true' if error < MAX_ERROR, else 'false'
*/
bool TRANSLINE::minimizeZ0Error1D( double* aVar )
{
double Z0_dest, Z0_current, Z0_result, angl_l_dest, increment, slope, error;
int iteration;
if( !std::isfinite( m_parameters[Z0_PRM] ) )
{
*aVar = NAN;
return false;
}
if( ( !std::isfinite( *aVar ) ) || ( *aVar == 0 ) )
{
*aVar = 0.001;
}
/* required value of Z0 */
Z0_dest = m_parameters[Z0_PRM];
/* required value of angl_l */
angl_l_dest = m_parameters[ANG_L_PRM];
/* Newton's method */
iteration = 0;
/* compute parameters */
calcAnalyze();
Z0_current = m_parameters[Z0_PRM];
error = fabs( Z0_dest - Z0_current );
while( error > MAX_ERROR )
{
iteration++;
increment = *aVar / 100.0;
*aVar += increment;
/* compute parameters */
calcAnalyze();
Z0_result = m_parameters[Z0_PRM];
/* f(w(n)) = Z0 - Z0(w(n)) */
/* f'(w(n)) = -f'(Z0(w(n))) */
/* f'(Z0(w(n))) = (Z0(w(n)) - Z0(w(n+delw))/delw */
/* w(n+1) = w(n) - f(w(n))/f'(w(n)) */
slope = ( Z0_result - Z0_current ) / increment;
slope = ( Z0_dest - Z0_current ) / slope - increment;
*aVar += slope;
if( *aVar <= 0.0 )
*aVar = increment;
/* find new error */
/* compute parameters */
calcAnalyze();
Z0_current = m_parameters[Z0_PRM];
error = fabs( Z0_dest - Z0_current );
if( iteration > 100 )
break;
}
/* Compute one last time, but with correct length */
m_parameters[Z0_PRM] = Z0_dest;
m_parameters[ANG_L_PRM] = angl_l_dest;
m_parameters[PHYS_LEN_PRM] = C0 / m_parameters[FREQUENCY_PRM]
/ sqrt( m_parameters[EPSILON_EFF_PRM] ) * m_parameters[ANG_L_PRM]
/ 2.0 / M_PI; /* in m */
calcAnalyze();
/* Restore parameters */
m_parameters[Z0_PRM] = Z0_dest;
m_parameters[ANG_L_PRM] = angl_l_dest;
m_parameters[PHYS_LEN_PRM] = C0 / m_parameters[FREQUENCY_PRM]
/ sqrt( m_parameters[EPSILON_EFF_PRM] ) * m_parameters[ANG_L_PRM]
/ 2.0 / M_PI; /* in m */
return error <= MAX_ERROR;
}
/**
* @function setErrorLevel
*
* set an error / warning level for a given parameter.
*
* @see TRANSLINE_OK
* @see TRANSLINE_WARNING
* @see TRANSLINE_ERROR
*
* @param aP parameter
* @param aErrorLevel Error level
*/
void TRANSLINE::setErrorLevel( PRMS_ID aP, char aErrorLevel )
{
switch( aErrorLevel )
{
case( TRANSLINE_WARNING ):
SetPropertyBgColorInDialog( aP, &warnCol );
break;
case( TRANSLINE_ERROR ):
SetPropertyBgColorInDialog( aP, &errCol );
break;
default:
SetPropertyBgColorInDialog( aP, &okCol );
break;
}
}
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