Re: [SI-LIST] : **error**: internal timestep too small

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From: Kim Helliwell (khelliwe@acuson.com)
Date: Fri Jan 21 2000 - 08:38:42 PST


Chris.H.Simon@gd-is.com wrote:
>
> Kim,
>
> I'm curious why Avanti's abandonment of the U model would bother you. Is
> there a situation where the use of the U element is an advantage over the W
> element (in terms of accuracy, runtime, ???) I guess I hadn't thought
> about it too much but the W element seems to give accurate results with
> reasonable runtimes for all of the cases I've investigated.
>

It's a philosophical issue, I guess. I spent many years developing
and supporting analog circuit simulators both as an individual
contributor and as a group manager, and my feeling is that, if
you have a model in a simulator, you either should support it or
remove it from the simulator. The failure mode that Arpad mentioned
and the response from Avant! made it sound like they know there are
problems with the U model, but couldn't be bothered to look into it.
That attitude offends me, is all.

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

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