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From: raoul@eplunix.UUCP (Nico Garcia)
Newsgroups: sci.electronics
Subject: Re: Filter simulation in Pspice
Message-ID: <967@eplunix.UUCP>
Date: 13 Nov 90 19:17:33 GMT
References: <1990Nov9.160343.3301@sunee.waterloo.edu>
Distribution: na
Organization: Eaton-Peabody Lab, Boston, MA
Lines: 20

In article <1990Nov9.160343.3301@sunee.waterloo.edu>, simpson@sunee.waterloo.edu (KFS Lam) writes:
> Hi, I am currently doing a passive filter design with Pspice
> on a PC. Unfortunately, Pspice performs DC analysis automatically
> at the beginning. Since my circuit is passive, there are no
> DC sources and Pspice starts to compliant about floating
> nodes. (Some of my nodes have capicitor connected to other

Hmmm. The big resistor to ground trick works well, and is actually
closer to physical situations (there is always *some* radiation of
AC, and leakage of DC). You might also incorporate leakage/series
resistances for your caps, depending on what kind of caps you use, and
series resistances for your inductances. Also, it makes sense to put
*some* kind of connection to ground on floating circuits. Who knows
what sort of static charges could build up and fry your caps while
you're not looking?

-- 
			Nico Garcia
			Designs by Geniuses for use by Idiots
			eplunix!cirl!raoul@eddie.mit.edu