RE: [IBIS-Users] IV Curves

Think about reflections off an open transmission line for your answer.

Tom Dagostino
Teraspeed Consulting Group LLC
503-430-1065
tom@teraspeed.com
www.teraspeed.com

-----Original Message-----
From: owner-ibis-users@eda.org [mailto:owner-ibis-users@eda.org]On
Behalf Of lee yang
Sent: Sunday, January 09, 2005 5:58 PM
To: ibis-users@eda.org
Subject: [IBIS-Users] IV Curves

Hi IBIS experts:

I have a few questions regarding IBIS data:
1) What is the reason of ground clamp and pulldown data is ground relative
while power clamp and pullup data is vcc relative?
2) The IV curves data is covered from -vcc to 2vcc, in what condition the
voltage would become -vcc? (eg1: output is driving vcc and the receiver end
is being shorted, the reflection coefficient is -1, then the maximum
negative voltage is 0V (vcc + (-1*vcc)=0); eg2: output is driving 0v and the
reciever end is being shorted, the reflection coefficient is -1 as well,
would it be any reflection if the output is driving 0V with reciever end
being shorted to ground?)
Hope you all could shed some light here.
Thanks.

Yours Faithfully,
LY

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Received on Sun Jan 9 21:14:59 2005