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Path: utzoo!utgpu!water!watnot!watmath!clyde!rutgers!ames!ucbcad!ucbvax!XEROX.COM!"Nahid_Ansari.ElSegundo"
From: "Nahid_Ansari.ElSegundo"@XEROX.COM.UUCP
Newsgroups: comp.lsi
Subject: Re: Internal time step error in SPICE2G6 ?
Message-ID: <870410-103048-3617@Xerox>
Date: Fri, 10-Apr-87 12:30:17 EST
Article-I.D.: Xerox.870410-103048-3617
Posted: Fri Apr 10 12:30:17 1987
Date-Received: Sat, 11-Apr-87 17:44:57 EST
Sender: daemon@ucbvax.BERKELEY.EDU
Distribution: world
Organization: The ARPA Internet
Lines: 16

Russ,

The problem you are having ("Internal Time Step Too SmaLL") is
unfortunately a very common one.  As the name implies, it has to do with
setting time steps when solving current equations.  The thing to do,
which works about 95% of the time, is to  set the option ABSTOL to 1
microamp (.Options abstol=1u).  Abstol is the absolute current error
tolerance with the default value of 1 picoamp which is a very small
value.  By setting it to 1microamp, you will sacrifice some accuracy,
but you will get the program running.  Also, you mentioned that you
initialized the internal nodes.  I don't know if you used UIC on your
Tran card or not; if you have, make sure you have specified  *all* the
nodes on your .IC card, otherwise you'll get the above error again.
Good Luck.

Nahid