From owner-ibis-users@eda.org Mon Nov  5 16:29:33 2001
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Reply-To: <jpowell@innoveda.com>
From: "Jon Powell" <jpowell@innoveda.com>
To: "'GUILLORY,DOUG \(HP-Boise,ex1\)'" <doug_guillory@hp.com>,
   <ibis-users@eda.org>
Subject: RE: Meaning of time in IBIS
Date: Mon, 5 Nov 2001 16:24:23 -0800
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If you are talking about the RISING and FALLING curves, the time 0 is meant
only as an internal
reference in that all of the RISING curves (for a given driver) have the
same 0 time.
All of the FALLING curves (for a given driver) have the same 0 time.
what that time is in reference to doesn't matter as long as it is the same
for the curves mentioned.

This is a necessary condition to be able to properly calculate Rise Time
Control properties
of drivers.

There have been several papers given on this at users groups and IBIS
meetings, one
may be in the archives.

Jon Powell


> -----Original Message-----
> From: owner-ibis-users@eda.org [mailto:owner-ibis-users@eda.org]On
> Behalf Of GUILLORY,DOUG (HP-Boise,ex1)
> Sent: Monday, November 05, 2001 9:31 AM
> To: 'ibis-users@eda.org'
> Subject: Meaning of time in IBIS
>
>
> I am having problems understanding what time=0 means in IBIS
> models.  Can
> anybody, please, tell me how time is referenced?  I don't see
> an explicit
> statement of what the reference is and it seems to vary from one model
> supplier to another.  Thanks.
>