Subject: [IBIS] RE: [IBIS-Users] IBIS issue at high frequencies
From: Hegazy, Hazem (hazem_hegazy@mentorg.com)
Date: Thu Aug 29 2002 - 01:09:13 PDT
Hi,
Should I ask at which rate or rise/fall time you generate the model? I mean,
the stimulus of the input side while extracting wave form tables is it fast
or slow compared to the tested frequency?
BR,
Hazem Hegazy
Development Engineer
IBIS & TAU Modeling Team
Mentor Graphics
Tel: +20(2) 4135458
Mobile: +20(10) 6052154
Fax: +20(2) 4141306
-----Original Message-----
From: Nirav Patel [mailto:nirav@agere.com]
Sent: Thursday, August 29, 2002 8:05 AM
To: ibis-users@eda.org; ibis@eda.org
Subject: [IBIS-Users] IBIS issue at high frequencies
IBIS gurus,
We are using Avanti HSPICE to correlate the IBIS
model performance to spice. We notice that the model
starts misbehaving abruptly as we increase the toggle
rate.
Our observation has been that the onset of this
misbehavior is a function of the delay through the
buffer. Buffers that have long propagation delays
tend to misbehave at lower toggle rates.
Does anybody have a clue on what may be the cause
of this issue? Any help will be very much appreciated.
Thanks in advance.
--Nirav
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