197 lines
7.1 KiB
C++
197 lines
7.1 KiB
C++
/*
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* twistedpair.h - twisted pair class definition
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*
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* Copyright (C) 2011 Michael Margraf <michael.margraf@alumni.tu-berlin.de>
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* Modifications 2011 for Kicad: Jean-Pierre Charras
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or (at
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* your option) any later version.
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*
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* This program is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this package; see the file COPYING. If not, write to
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* the Free Software Foundation, Inc., 51 Franklin Street - Fifth Floor,
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* Boston, MA 02110-1301, USA.
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*
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*/
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#include <cmath>
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#include <cstdio>
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#include <cstdlib>
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#include <cstring>
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#include "twistedpair.h"
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#include "units.h"
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TWISTEDPAIR::TWISTEDPAIR() : TRANSLINE()
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{
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m_Name = "TwistedPair";
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Init();
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}
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/**
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* \f$ \theta = \arctan\left( T \cdot \pi \cdot D_{out} \right) \f$
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*
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* Where :
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* - \f$ \theta \f$ : pitch angle
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* - \f$ T \f$ : Number of twists per unit length
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* - \f$ D_{out} \f$ : Wire diameter with insulation
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*
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* \f$ e_{eff} = e_{env} \cdot \left( 0.25 + 0.0007 \cdot \theta^2 \right)\cdot\left(e_r-e_{env}\right) \f$
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*
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* Where :
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* - \f$ e_{env} \f$ : relative dielectric constant of air ( or some other surronding material ),
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* - \f$ e_r \f$ : relative dielectric constant of the film insulation,
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* - \f$ e_{eff} \f$ : effective relative dielectric constant
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*
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* \f$ Z_0 = \frac{Z_\mathrm{VACUUM}}{\pi \cdot \sqrt{e_{eff}}}\cosh^{-1}\left(\frac{D_{out}}{D_{in}}\right) \f$
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*
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* - \f$ Z_0 \f$ : line impedance
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* - \f$ Z_\mathrm{VACUUM} \f$ : vacuum impedance
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* - \f$ D_{in} \f$ : Wire diameter without insulation
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*
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* Reference for above equations :
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*
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* [1] : P. Lefferson, ``Twisted Magnet Wire Transmission Line,''
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* IEEE Transactions on Parts, Hybrids, and Packaging, vol. PHP-7, no. 4, pp. 148-154, Dec. 1971.
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*
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* The following URL can be used as reference : http://qucs.sourceforge.net/tech/node93.html
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**/
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void TWISTEDPAIR::calcAnalyze()
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{
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double tw = atan( m_parameters[TWISTEDPAIR_TWIST_PRM] * M_PI
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* m_parameters[PHYS_DIAM_OUT_PRM] ); // pitch angle
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m_parameters[EPSILON_EFF_PRM] =
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m_parameters[TWISTEDPAIR_EPSILONR_ENV_PRM]
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+ ( 0.25 + 0.0007 * tw * tw )
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* ( m_parameters[EPSILONR_PRM] - m_parameters[TWISTEDPAIR_EPSILONR_ENV_PRM] );
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m_parameters[Z0_PRM] =
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ZF0 / M_PI / sqrt( m_parameters[EPSILON_EFF_PRM] )
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* acosh( m_parameters[PHYS_DIAM_OUT_PRM] / m_parameters[PHYS_DIAM_IN_PRM] );
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m_parameters[LOSS_CONDUCTOR_PRM] =
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10.0 / log( 10.0 ) * m_parameters[PHYS_LEN_PRM] / m_parameters[SKIN_DEPTH_PRM]
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/ m_parameters[SIGMA_PRM] / M_PI / m_parameters[Z0_PRM]
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/ ( m_parameters[PHYS_DIAM_IN_PRM] - m_parameters[SKIN_DEPTH_PRM] );
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m_parameters[LOSS_DIELECTRIC_PRM] = 20.0 / log( 10.0 ) * m_parameters[PHYS_LEN_PRM] * M_PI / C0
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* m_parameters[FREQUENCY_PRM]
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* sqrt( m_parameters[EPSILON_EFF_PRM] )
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* m_parameters[TAND_PRM];
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m_parameters[ANG_L_PRM] = 2.0 * M_PI * m_parameters[PHYS_LEN_PRM]
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* sqrt( m_parameters[EPSILON_EFF_PRM] ) * m_parameters[FREQUENCY_PRM]
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/ C0; // in radians
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}
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// -------------------------------------------------------------------
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void TWISTEDPAIR::show_results()
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{
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setResult( 0, m_parameters[EPSILON_EFF_PRM], "" );
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setResult( 1, m_parameters[LOSS_CONDUCTOR_PRM], "dB" );
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setResult( 2, m_parameters[LOSS_DIELECTRIC_PRM], "dB" );
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setResult( 3, m_parameters[SKIN_DEPTH_PRM] / UNIT_MICRON, "µm" );
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}
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void TWISTEDPAIR::showAnalyze()
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{
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setProperty( Z0_PRM, m_parameters[Z0_PRM] );
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setProperty( ANG_L_PRM, m_parameters[ANG_L_PRM] );
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// Check for errors
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if( !std::isfinite( m_parameters[Z0_PRM] ) || m_parameters[Z0_PRM] < 0 )
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setErrorLevel( Z0_PRM, TRANSLINE_ERROR );
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if( !std::isfinite( m_parameters[ANG_L_PRM] ) || m_parameters[ANG_L_PRM] < 0 )
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setErrorLevel( ANG_L_PRM, TRANSLINE_ERROR );
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// Find warnings to display - physical parameters
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if( !std::isfinite( m_parameters[PHYS_DIAM_IN_PRM] ) || m_parameters[PHYS_DIAM_IN_PRM] <= 0.0 )
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setErrorLevel( PHYS_DIAM_IN_PRM, TRANSLINE_WARNING );
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if( !std::isfinite( m_parameters[PHYS_DIAM_OUT_PRM] )
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|| m_parameters[PHYS_DIAM_OUT_PRM] <= 0.0 )
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{
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setErrorLevel( PHYS_DIAM_OUT_PRM, TRANSLINE_WARNING );
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}
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if( m_parameters[PHYS_DIAM_IN_PRM] > m_parameters[PHYS_DIAM_OUT_PRM] )
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{
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setErrorLevel( PHYS_DIAM_IN_PRM, TRANSLINE_WARNING );
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setErrorLevel( PHYS_DIAM_OUT_PRM, TRANSLINE_WARNING );
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}
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if( !std::isfinite( m_parameters[PHYS_LEN_PRM] ) || m_parameters[PHYS_LEN_PRM] < 0.0 )
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setErrorLevel( PHYS_LEN_PRM, TRANSLINE_WARNING );
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}
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void TWISTEDPAIR::showSynthesize()
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{
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if( isSelected( PHYS_DIAM_IN_PRM ) )
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setProperty( PHYS_DIAM_IN_PRM, m_parameters[PHYS_DIAM_IN_PRM] );
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else if( isSelected( PHYS_DIAM_OUT_PRM ) )
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setProperty( PHYS_DIAM_OUT_PRM, m_parameters[PHYS_DIAM_OUT_PRM] );
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setProperty( PHYS_LEN_PRM, m_parameters[PHYS_LEN_PRM] );
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// Check for errors
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if( !std::isfinite( m_parameters[PHYS_DIAM_IN_PRM] ) || m_parameters[PHYS_DIAM_IN_PRM] <= 0.0 )
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{
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if( isSelected( PHYS_DIAM_IN_PRM ) )
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setErrorLevel( PHYS_DIAM_IN_PRM, TRANSLINE_ERROR );
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else
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setErrorLevel( PHYS_DIAM_IN_PRM, TRANSLINE_WARNING );
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}
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if( !std::isfinite( m_parameters[PHYS_DIAM_OUT_PRM] )
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|| m_parameters[PHYS_DIAM_OUT_PRM] <= 0.0 )
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{
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if( isSelected( PHYS_DIAM_OUT_PRM ) )
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setErrorLevel( PHYS_DIAM_OUT_PRM, TRANSLINE_ERROR );
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else
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setErrorLevel( PHYS_DIAM_OUT_PRM, TRANSLINE_WARNING );
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}
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if( m_parameters[PHYS_DIAM_IN_PRM] > m_parameters[PHYS_DIAM_OUT_PRM] )
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{
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if( isSelected( PHYS_DIAM_IN_PRM ) )
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setErrorLevel( PHYS_DIAM_IN_PRM, TRANSLINE_ERROR );
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else if( isSelected( PHYS_DIAM_OUT_PRM ) )
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setErrorLevel( PHYS_DIAM_OUT_PRM, TRANSLINE_ERROR );
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}
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if( !std::isfinite( m_parameters[PHYS_LEN_PRM] ) || m_parameters[PHYS_LEN_PRM] < 0.0 )
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setErrorLevel( PHYS_LEN_PRM, TRANSLINE_ERROR );
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// Check for warnings
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if( !std::isfinite( m_parameters[Z0_PRM] ) || m_parameters[Z0_PRM] < 0 )
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setErrorLevel( Z0_PRM, TRANSLINE_WARNING );
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if( !std::isfinite( m_parameters[ANG_L_PRM] ) || m_parameters[ANG_L_PRM] < 0 )
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setErrorLevel( ANG_L_PRM, TRANSLINE_WARNING );
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}
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#define MAX_ERROR 0.000001
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// -------------------------------------------------------------------
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void TWISTEDPAIR::calcSynthesize()
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{
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if( isSelected( PHYS_DIAM_IN_PRM ) )
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minimizeZ0Error1D( &( m_parameters[PHYS_DIAM_IN_PRM] ) );
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else
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minimizeZ0Error1D( &( m_parameters[PHYS_DIAM_OUT_PRM] ) );
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}
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