RE: [IBIS-Users] sweep range extrapolation problem

SPICE clamp/ESD diodes are usually well-behaved over the full range if the
diode series resistance is modeled (RS _NOT_ 0.0 Ohms).

- Lynne

-----Original Message-----
From: owner-ibis-users@eda.org [mailto:owner-ibis-users@eda.org] On Behalf
Of Guoli Wang
Sent: Wednesday, May 19, 2004 9:56 AM
Cc: ibis@eda.org; ibis-users
Subject: [IBIS-Users] sweep range extrapolation problem

Hi All,

The sweeping range (-vcc~2vcc) is so big that the spice model is not
well behaved over the range when the ESD diodes are forward biased. I
read from the IBIS cookbook that we can do linear extraction from the
range that spice model can handle up to the whole range. Is there any
special rule or tool for the "linear extraction"? How critical is it
of the extrapolation to be accurate? Is it preferred to measure in
real silicon device to get those data?

Thanks for any help.

Guoli

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Received on Wed May 19 11:19:50 2004