[SI-LIST] : Re: [SI-LIST] The correct way to short tow nodes in SPICE is?

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From: Kim Helliwell ([email protected])
Date: Fri Oct 20 2000 - 09:49:13 PDT

Michael Khusid wrote:
> >From reading SPICE manuals some time ago, I vaguely recall description of
> using voltage sources in AC simulation. As far as I understood, Spice would
> replace all non-AC voltage sources with open circuits. In such a case, a
> model with 0 volt Voltage source would also become an open and would cause a
> serious error for AC analysis.
> Am I right or wrong?
> Mike Khusid
> Signal Integrity
> Sitara Networks

If you think about it, that doesn't pass the sanity check. DC voltage
sources are what determine the bias conditions, and DC source branches
must be there for the bias solution. And they are not removed during the
AC iterations. I think you are misinterpreting something you read.

The best way to confirm this, though, is to try it.


Kim Helliwell
Senior CAE Engineer
Acuson Corporation
Phone: 650 694 5030  FAX: 650 943 7260

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