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From: info-vlsi@ucbvax.UUCP
Newsgroups: mod.vlsi
Subject: (none)
Message-ID: <8601100312.AA11954@uw-beaver.arpa>
Date: Thu, 9-Jan-86 17:39:53 EST
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Posted: Thu Jan  9 17:39:53 1986
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To: tekcrl!tektronix!uw-beaver!cornell!vax135!houxm!mhuxt!mhuxr!ulysses!cbosgd!ucbvax!info-vlsi
Subject: Re: SPICE problem inquiry
References: <8601032103.AA01124@>

I'm sure you'll get 1000 replies, but:

SPICE will divide the user timestep into smaller chunks if that is necessary
to compute fast changes with sufficient accuracy.  If you have a circuit 
with no parasitics and positive feedback, it may make infinitely fast
transitions.  

Add parasitics if you haven't already, and increase the voltage
and charge error tolerances on the option card.  I don't know what 
particular version of SPICE you are using, so it's difficult to be more
explicit.  Let us know how you make out.


Keith Lofstrom
MS 59-316, Tektronix, PO 500, Beaverton OR 97077  (503)-627-4052
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