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QUCS-src
qucs-0.0.16
qucs-core
src
components
resistor.cpp
Go to the documentation of this file.
1
/*
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* resistor.cpp - resistor class implementation
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*
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* Copyright (C) 2003, 2004, 2005, 2006, 2008 Stefan Jahn <stefan@lkcc.org>
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*
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* This 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, or (at your option)
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* any later version.
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*
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* This software is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU 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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* $Id: resistor.cpp 1825 2011-03-11 20:42:14Z ela $
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*
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*/
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#if HAVE_CONFIG_H
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# include <config.h>
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#endif
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#include "
component.h
"
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#include "
resistor.h
"
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resistor::resistor () :
circuit
(2) {
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type =
CIR_RESISTOR
;
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}
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void
resistor::initSP
(
void
) {
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initModel ();
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allocMatrixS
();
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}
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void
resistor::calcSP
(nr_double_t) {
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// calculate S-parameters
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nr_double_t z =
getScaledProperty
(
"R"
) /
z0
;
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setS
(
NODE_1
,
NODE_1
, z / (z + 2));
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setS
(
NODE_2
,
NODE_2
, z / (z + 2));
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setS
(
NODE_1
,
NODE_2
, 2 / (z + 2));
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setS
(
NODE_2
,
NODE_1
, 2 / (z + 2));
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}
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void
resistor::calcNoiseSP
(nr_double_t) {
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// calculate noise correlation matrix
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nr_double_t r =
getScaledProperty
(
"R"
);
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nr_double_t
T
=
getPropertyDouble
(
"Temp"
);
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nr_double_t f =
kelvin
(T) * 4.0 * r *
z0
/
sqr
(2.0 *
z0
+ r) /
T0
;
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setN
(
NODE_1
,
NODE_1
, +f);
setN
(
NODE_2
,
NODE_2
, +f);
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setN
(
NODE_1
,
NODE_2
, -f);
setN
(
NODE_2
,
NODE_1
, -f);
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}
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void
resistor::calcNoiseAC
(nr_double_t) {
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// calculate noise current correlation matrix
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nr_double_t r =
getScaledProperty
(
"R"
);
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if
(r > 0.0 || r < 0.0) {
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nr_double_t
T
=
getPropertyDouble
(
"Temp"
);
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nr_double_t f =
kelvin
(T) /
T0
* 4.0 / r;
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setN
(
NODE_1
,
NODE_1
, +f);
setN
(
NODE_2
,
NODE_2
, +f);
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setN
(
NODE_1
,
NODE_2
, -f);
setN
(
NODE_2
,
NODE_1
, -f);
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}
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}
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void
resistor::initModel (
void
) {
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/* if this is a controlled resistor then do nothing here */
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if
(
hasProperty
(
"Controlled"
))
return
;
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nr_double_t
T
=
getPropertyDouble
(
"Temp"
);
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nr_double_t Tn =
getPropertyDouble
(
"Tnom"
);
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nr_double_t
R
=
getPropertyDouble
(
"R"
);
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nr_double_t DT = T - Tn;
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// compute R temperature dependency
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nr_double_t Tc1 =
getPropertyDouble
(
"Tc1"
);
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nr_double_t Tc2 =
getPropertyDouble
(
"Tc2"
);
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R = R * (1 + DT * (Tc1 + Tc2 * DT));
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setScaledProperty
(
"R"
,
R
);
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}
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void
resistor::initDC
(
void
) {
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initModel ();
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nr_double_t r =
getScaledProperty
(
"R"
);
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// for non-zero resistances usual MNA entries
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if
(r != 0.0) {
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nr_double_t g = 1.0 / r;
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setVoltageSources
(0);
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allocMatrixMNA
();
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setY
(
NODE_1
,
NODE_1
, +g);
setY
(
NODE_2
,
NODE_2
, +g);
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setY
(
NODE_1
,
NODE_2
, -g);
setY
(
NODE_2
,
NODE_1
, -g);
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}
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// for zero resistances create a zero voltage source
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else
{
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setVoltageSources
(1);
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setInternalVoltageSource
(1);
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allocMatrixMNA
();
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voltageSource
(
VSRC_1
,
NODE_1
,
NODE_2
);
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}
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}
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/* The calcDC() function is here partly implemented again because the
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circuit can be used to simulate controlled non-zero resistances. */
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void
resistor::calcDC
(
void
) {
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nr_double_t r =
getScaledProperty
(
"R"
);
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// for non-zero resistances usual MNA entries
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if
(r != 0.0) {
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nr_double_t g = 1.0 / r;
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setY
(
NODE_1
,
NODE_1
, +g);
setY
(
NODE_2
,
NODE_2
, +g);
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setY
(
NODE_1
,
NODE_2
, -g);
setY
(
NODE_2
,
NODE_1
, -g);
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}
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}
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void
resistor::initAC
(
void
) {
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initDC
();
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}
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void
resistor::calcAC
(nr_double_t) {
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calcDC
();
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}
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void
resistor::initTR
(
void
) {
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initDC
();
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}
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void
resistor::calcTR
(nr_double_t) {
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calcDC
();
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}
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// Initialize computation of MNA matrix entries for HB.
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void
resistor::initHB
(
void
) {
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initModel ();
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nr_double_t r =
getScaledProperty
(
"R"
);
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setVoltageSources
(1);
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setInternalVoltageSource
(1);
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allocMatrixMNA
();
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voltageSource
(
VSRC_1
,
NODE_1
,
NODE_2
);
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setD
(
VSRC_1
,
VSRC_1
, -r);
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}
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// properties
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PROP_REQ
[] = {
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{
"R"
,
PROP_REAL
, { 50,
PROP_NO_STR
},
PROP_NO_RANGE
},
PROP_NO_PROP
};
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PROP_OPT
[] = {
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{
"Temp"
,
PROP_REAL
, { 26.85,
PROP_NO_STR
},
PROP_MIN_VAL
(
K
) },
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{
"Tc1"
,
PROP_REAL
, { 0,
PROP_NO_STR
},
PROP_NO_RANGE
},
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{
"Tc2"
,
PROP_REAL
, { 0,
PROP_NO_STR
},
PROP_NO_RANGE
},
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{
"Tnom"
,
PROP_REAL
, { 26.85,
PROP_NO_STR
},
PROP_MIN_VAL
(
K
) },
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PROP_NO_PROP
};
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struct
define_t
resistor
::cirdef =
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{
"R"
, 2,
PROP_COMPONENT
,
PROP_NO_SUBSTRATE
,
PROP_LINEAR
,
PROP_DEF
};
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