[SI-LIST] : simlifying Spice models

Ron Miller (rmiller@Brocade.COM)
Thu, 15 Jul 1999 13:36:17 -0700

Hi guys

I need to reduce the complexity of a very complex spice model to use in
another larger circuit.

The present model has arrays of 16 cmos transistors in about a dozen places
on the schematic.

If the models were electrical based I could scale the parameters to reduce the
arrays to one part. However, the models I have are dimensional.

So, the two approaches I see are :

1. Simulate the model all by itself to generate a response, and then
Optimize an assumed electrical circuit to give the same response. or

2. Use a SPICE to IBIS conversion, and then convert back to SPICE
with an IBIS to SPICE conversion.

Since I have never used IBIS, and have not kept up to date with SPICE over
the last 20 years, I do not have a feel for how much time this will take.

Does anyone have a feel for this.

Ron Miller

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