[SI-LIST] Re: simulation in Nexxim
- From: agathon <hreidmarkailen@xxxxxxxxx>
- To: "Mohamad Haghtalab" <mohaghtalab@xxxxxxxxx>
- Date: Tue, 9 Sep 2008 12:17:17 -0700
I'm not sure exactly what the symptom is (what you mean by dc continuation)
but I've seen a dc offset and strange "integration" or clean postive ramp
component added to hspice results for a channel illustrated as:
behavioral source -- sparam & hspice interconnect -- amplifier.
HSpice 2004 or 2005 was used and Ansoft HFSS models w/ dc extrapolation. A
colleague just refreshed my memory on it: The appearance was that hspice V
sources and ABSV param had influence on simulator behavior. Workaround was
to use a current source w/ 1ohm load and setting ABSI = 0.1nA (smaller than
default I believe). Ie: more sim accuracy is needed for the responses.
I don't suspect a noncausal issue since that would be characterized by
response before stimulus or output signal presence w/ no input energy,
although the "ramping" mentioned above mimics that. A passivity problem
typically shows up as catastrophic oscillation.
On Tue, Sep 9, 2008 at 12:50 AM, Mohamad Haghtalab <mohaghtalab@xxxxxxxxx>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
> >
> >
> > ------------------------------------------------------------------
>
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