Re: [SI-LIST] : receiver jitter

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From: D. C. Sessions (dc.sessions@vlsi.com)
Date: Wed Jan 19 2000 - 11:52:24 PST


"Chan, Michael" wrote:
>
> Chris:
> I am very interested to know why "IBIS MODEL" is not good enough
> for highspeed design. Can you elaborate on that? Thanks.

In brief, IBIS doesn't provide any information about supply (return
path) connectivity and the associated parasitics. Since these are
the dominant device characteristics that tends to make for problems.

Unlike process data, there's really no big issue with providing the
supply network specs for a part. The problem is just that the EDA
community has been a bit slow supporting return-path modeling, in
large part because their customers haven't been demanding it.

The customer base hasn't demanded it because many of them are just
getting used to doing SI in the first place and don't even know that
the problem is serious, and the others who do know about the problem
have found ways to work around it (such as CC's use of SPICE.)

Now if you really want the problem solved, you should yank Bob Haller's
chain (he's your IBIS rep) and make sure your EDA suppliers know that
this is a hot topic.

-- 
D. C. Sessions
dc.sessions@vlsi.com

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