[SI-LIST] Re: simulation in Nexxim
- From: Saoer Sinaga <saoer.sinaga@xxxxxxxxx>
- To: mohaghtalab@xxxxxxxxx
- Date: Tue, 09 Sep 2008 20:35:56 +0200
I am not sure I can explain it correctly, but the way I understand it is
that a causal system is where the reaction happens after an action. In
other words, the output at time t0 only depends on the input at t0 or
before. There is a mathematical requirements to be fulfilled for a
causal system, but I don't remember it by heart :D.
It can also be that the S-par of your passive system is not passive.
Solution? It is a tricky question. My experience with Ansoft tools
e.g. HFSS, it gives a very accurate S-parameter, however, often
non-passive (never checked the causality). You can try to generate
broadband spice out of your S-par using many commercial tools such as
sonnet, sigrity, ADS, etc.
regards,
Saoer
Mohamad Haghtalab wrote:
> it's transient simulation,the s parameter model contain 0 Hz
> data(matrix),but what's non-causal S-param?,what's the solution?
>
> regards
>
> --- On *Mon, 9/8/08, Saoer Sinaga /<saoer.sinaga@xxxxxxxxx>/* wrote:
>
> From: Saoer Sinaga <saoer.sinaga@xxxxxxxxx>
> Subject: [SI-LIST] Re: simulation in Nexxim
> To: "'SI LIST'" <si-list@xxxxxxxxxxxxx>
> Date: Monday, September 8, 2008, 10:39 PM
>
> Is it a frequency domain simulation or transient simulation. The causes
> are likely to be non-causal S-par and/or no DC data in your S-par.
>
> saoer
>
> Mohamad Haghtalab wrote:
> >
> > Hi all
> > I have a design in Nexxim(ansoft designer) in which there is both
> S-parameter and Spice models blocks,s parameter blocks all have one port
> named
> 'ref ' ,I connect all these ports to ground in shematic,if all models
> were S parameter when simulating the design we dont have any error ,but
> if we
> add a spice model (e.g. LNA model) we have error in simulation
> > (DC continuation...),the problem seems to be the refrence of spice
> model(?),can you help me about that?
> >
> > Regards
> >
> > Haghtalab
> >
> >
> > ------------------------------------------------------------------
> > To unsubscribe from si-list:
> > si-list-request@xxxxxxxxxxxxx with 'unsubscribe' in the Subject
> field
> >
> > or to administer your membership from a web page, go to:
> > //www.freelists.org/webpage/si-list
> >
> > For help:
> > si-list-request@xxxxxxxxxxxxx with 'help' in the Subject field
> >
> >
> > List technical documents are available at:
> > http://www.si-list.net
> >
> > List archives are viewable at:
> > //www.freelists.org/archives/si-list
> > or at our remote archives:
> > http://groups.yahoo.com/group/si-list/messages
> > Old (prior to June 6, 2001) list archives are viewable at:
> > http://www.qsl.net/wb6tpu
> >
> >
> >
> >
>
> ------------------------------------------------------------------
> To unsubscribe from si-list:
> si-list-request@xxxxxxxxxxxxx with 'unsubscribe' in the Subject field
>
> or to administer your membership from a web page, go to:
> //www.freelists.org/webpage/si-list
>
> For help:
> si-list-request@xxxxxxxxxxxxx with 'help' in the Subject field
>
>
> List technical documents are available at:
> http://www.si-list.net
>
> List archives are viewable at:
> //www.freelists.org/archives/si-list
> or at our remote archives:
> http://groups.yahoo.com/group/si-list/messages
> Old (prior to June 6, 2001) list archives are viewable at:
> http://www.qsl.net/wb6tpu
>
>
>
>
>
------------------------------------------------------------------
To unsubscribe from si-list:
si-list-request@xxxxxxxxxxxxx with 'unsubscribe' in the Subject field
or to administer your membership from a web page, go to:
//www.freelists.org/webpage/si-list
For help:
si-list-request@xxxxxxxxxxxxx with 'help' in the Subject field
List technical documents are available at:
http://www.si-list.net
List archives are viewable at:
//www.freelists.org/archives/si-list
or at our remote archives:
http://groups.yahoo.com/group/si-list/messages
Old (prior to June 6, 2001) list archives are viewable at:
http://www.qsl.net/wb6tpu
Other related posts:
