[Top][All Lists]
[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]
Re: [Gnucap-devel] qucs parser
From: |
al davis |
Subject: |
Re: [Gnucap-devel] qucs parser |
Date: |
Fri, 16 Mar 2012 00:38:53 -0400 |
User-agent: |
KMail/1.13.7 (Linux/2.6.32-trunk-amd64; KDE/4.6.5; x86_64; ; ) |
On Thursday 15 March 2012, Felix Salfelder wrote:
> We have mostly figured out the parser and the parameter
> passing. it works in some examples. others should work after
> completing the corresponding set_param* functions.
Good .. I think the qucs people will like it too.
> what remains (on gnucap side) is the probes. qucs does not
> issue .print commands, but has {i,v} probe devices, which
> add themselves to the printlist. we had no trouble to
> implement an ELEMENT doing, what the qucs-style probes do
> and hacked a simple hook in the backend, which makes these
> probes register the corresponding probes.
In a way, I like the qucs approach that everything, including
probes, is a netlist element. A while back, I implemented a
"meter" device that provides some new probes like "gain".
If all you can look at is voltage and current, the idea of all
probes are elements is a good one. But there is a lot more to
probe than voltage and current. .. things like gm or ft of a
transistor, instantaneous capacitance of a diode used as a
variable capacitor ....
One thought is to make a "wire" or "net" a first class object.
A wire could be perfect, and give you a bunch of probes, or it
could have electrical characteristics like resistance or delay.
I think this is needed anyway, for schematic and layout interface.
> there seem to be hardly any more options (we don't want to
> change qucs for that matter), and i like the idea of having
> devices add probes. would you give a hint on how to
> implement this functionality without breaking other things?
> i'd like to add this functionality, but i'm not feeling
> creative...
Here's the code for a "meter" device. It adds a "gain" probe,
and inherits all of the probes than an ELEMENT has.
/*$Id$ -*- C++ -*-
* Copyright (C) 2010 Albert Davis
* Author: Albert Davis <address@hidden>
*
* This file is part of "Gnucap", the Gnu Circuit Analysis Package
*
* 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 3, 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 program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
* 02110-1301, USA.
*------------------------------------------------------------------
* 2-port "meter" device
* does nothing to the circuit, but has probes
*/
#include "globals.h"
#include "e_elemnt.h"
#include "u_xprobe.h"
/*--------------------------------------------------------------------------*/
namespace {
/*--------------------------------------------------------------------------*/
class DEV : public ELEMENT {
private:
explicit DEV(const DEV& p) :ELEMENT(p) {}
public:
explicit DEV() :ELEMENT() {}
private: // override virtual
char id_letter()const {return '\0';}
std::string value_name()const {return "";}
std::string dev_type()const {return "meter";}
int max_nodes()const {return 4;}
int min_nodes()const {return 4;}
int matrix_nodes()const {return 4;}
int net_nodes()const {return 4;}
CARD* clone()const {return new DEV(*this);}
void tr_iwant_matrix() {}
void ac_iwant_matrix() {}
void precalc_last();
double tr_involts()const {return dn_diff(_n[IN1].v0(), _n[IN2].v0());}
double tr_involts_limited()const {return tr_involts();}
COMPLEX ac_involts()const {return _n[IN1]->vac() - _n[IN2]->vac();}
double tr_probe_num(const std::string&)const;
XPROBE ac_probe_ext(const std::string&)const;
std::string port_name(int i)const {
assert(i >= 0);
assert(i < 4);
static std::string names[] = {"outp", "outn", "inp", "inn"};
return names[i];
}
};
/*--------------------------------------------------------------------------*/
/*--------------------------------------------------------------------------*/
void DEV::precalc_last()
{
ELEMENT::precalc_last();
set_constant(true);
set_converged();
}
/*--------------------------------------------------------------------------*/
double DEV::tr_probe_num(const std::string& x)const
{
if (Umatch(x, "gain ")) {
return tr_outvolts() / tr_involts();
}else{
return ELEMENT::tr_probe_num(x);
}
}
/*--------------------------------------------------------------------------*/
XPROBE DEV::ac_probe_ext(const std::string& x)const
{
if (Umatch(x, "gain ")) {
return XPROBE(ac_outvolts() / ac_involts());
}else{
return ELEMENT::ac_probe_ext(x);
}
}
/*--------------------------------------------------------------------------*/
/*--------------------------------------------------------------------------*/
DEV p1;
DISPATCHER<CARD>::INSTALL d1(&device_dispatcher, "meter", &p1);
}
/*--------------------------------------------------------------------------*/
/*--------------------------------------------------------------------------*/