Subject: [IBIS-Users] RE: [IBIS] IBIS Model generation of I/O buffer with over voltage protection
From: Muranyi, Arpad (arpad.muranyi@intel.com)
Date: Mon Nov 17 2003 - 11:17:06 PST
Resend due to reflector problems.
Arpad
=================================
-----Original Message-----
From: Muranyi, Arpad
Sent: Monday, November 10, 2003 12:13 PM
To: ibis@eda.org
Cc: ibis-users@eda.org
Subject: RE: [IBIS] IBIS Model generation of I/O buffer with over
voltage protection
Ranjan,
I would think that this effect would show up in your IV curve shape and
no further action would be required. The only complication I would see
is that the direction of the sweep may result in a different response,
kind of like hysteresis. In that case IBIS would not be able to capture
the complete behavior of that circuit, but you could make a reasonably
good estimate by picking one of the two paths for your IV curve in the
IBIS model.
I hope this helps,
Arpad Muranyi
Intel Corporation
=======================================================================
-----Original Message-----
From: owner-ibis@eda.org [mailto:owner-ibis@eda.org]On Behalf Of Ranjan
Kumar Sahoo
Sent: Friday, November 07, 2003 8:42 AM
To: ibis@eda.org
Cc: ibis-users@eda.org
Subject: [IBIS] IBIS Model generation of I/O buffer with over voltate
protection
Hi,
We would like to know how to generate the IBIS model when the output
driver has an over voltage protection circuit; means when the pad
voltage rises above VCC, then the PMOS pull-up will be turned-off by
tracking the pad voltage . How to control or specify the sweep voltage
for the pull-up curve, or do we need to turn -off the over voltage
protection circuit for IBIS generation.
Thanks in advance,
Ranjan
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