qucs-help

[Qucs-help] Spice netlist translation

[Marcin K. <mk...@po...>]

I started using Qucs a few days ago. I'm using the 0.0.7 Windows =
version. I'm actually working at my university on spiral inductors =
simulation and modeling. Qucs core solver, without the GUI is what I was =
looking for. Great job. Spice or other commerial solvers are much too =
big for my needs.=20
=20
The distribiution contains qucsconv program to convert Spice netlists to =
qucs netlist. How to use it? Using the command line I did get with -h =
switch on both windows version and the one I compiled under cygwin, I'm =
not getting any results. I used for test purposes *.cir files from =
PSPICE.
What could be the source of the problem?
=20
Martin=20
=20
PS. Who prepared the polish translation of Qucs. I found the existing =
sometimes weird and I would gladly help.

Re: [Qucs-help] Spice netlist translation

[Stefan J. <st...@gr...>]

On So, 14.08.2005, 17:45, Marcin Kaluza wrote:

Hello!

> I started using Qucs a few days ago. I'm using the 0.0.7 Windows version.
> I'm actually working at my university on spiral inductors simulation and
> modeling. Qucs core solver, without the GUI is what I was looking for.
> Great job. Spice or other commerial solvers are much too big for my needs.
>
> The distribiution contains qucsconv program to convert Spice netlists to
> qucs netlist. How to use it? Using the command line I did get with -h
> switch on both windows version and the one I compiled under cygwin, I'm
> not getting any results. I used for test purposes *.cir files from PSPICE.
> What could be the source of the problem?

Of course you can use qucsconv as standalone.  There is a manpage
'qucsconv.1'.  QucsConv is used by Qucs when you try the SPICE component
(see file data components).  Try it...

> PS. Who prepared the polish translation of Qucs. I found the existing
> sometimes weird and I would gladly help.

Darius did the polish translation (see CC).  If you can help finishing
the translation, this would be great :-)

Cheers, Stefan.

Re: [Qucs-help] Spice netlist translation

[Stefan J. <st...@gr...>]

On So, 21.08.2005, 10:30, Marcin Kaluza wrote:

> Stefan,

Hi!

> hopefully, I was able to get rid of all mutual inductances in my netlists.
> In the very particular case of the RLC networks I'm simulating, I was able
> to erase them, adding their values or substracting from the inductances.
> So
> I'm can use qucs.
> My goal is to calculate the 2x2 impedance matrix of my RLC networks,
> calcualted for a single frequemcy point..
> I could do it the standard way, using the currents/voltages at the
> entry/exit ports and having to change the elements connected to those
> ports
> to calculate the different elements of the impedance matrix which means in
> fact running more than one simulation, to get the entire matrix.
>>From my actual understanding of qucs, I could also use the S parameters
> simulation and transform the resulting S parameters to Y parameters.

... to Z-parameters I think?

> What I would like to achieve is to get from qucsator.exe as output only
> and
> only my 2x2 impedance matrix. I belive it is possible, but would it be
> easy?
> If I would like to modify the code for my purposes, where should I look
> for?

You can use the spice component, select the (2) ports you need and then
place S-parameter ports at these ports, then select the frequency in
the S-parameter simulation box.  Also you need to place a ground at the
reference port of the spice component.  The add a equation to the
schematic and add:

  Z=stoz(S)

The simulation results will contain the Z-parameters then.

Hope this helps,
  Stefan.