RE: [IBIS-Users] IBIS model check

From: Muranyi, Arpad <arpad.muranyi_at_.....> Date: Wed Aug 17 2005 - 11:15:05 PDT · This archive was generated by hypermail 2.1.8 : Wed Aug 17 2005 - 11:16:29 PDT

The best way for checking the correctness of your
IBIS model is to overlay its IV and Vt curves with
the corresponding curves generated from the SPICE
model or measurement.

Arpad
==================================================

-----Original Message-----
From: owner-ibis-users@eda.org [mailto:owner-ibis-users@eda.org] On Behalf Of Indira Gazula
Sent: Wednesday, August 17, 2005 10:53 AM
To: ibis-users@eda.org
Subject: [IBIS-Users] IBIS model check

Hi All,

I have a general question: How does one check if the IBIS model provided has
correctly generated data. I ask this because, I was recently working on a
model which I thought was generationg unneccesarily high voltage levels
(point-to-point). To test I had just connected the IO model I had to itself,
without any interconnects in-between and found the voltages to be beyond the
spec levels. I understand that the model impedance might not be matched to
the load value the data was generated for, but was just wondering how one
could make sure.

Regards,
Indira.

-----Original Message-----
From: owner-ibis-users@eda.org [mailto:owner-ibis-users@eda.org]On
Behalf Of Muranyi, Arpad
Sent: Wednesday, August 17, 2005 9:43 AM
To: ibis-users@eda.org
Subject: RE: [IBIS-Users] Mixed-Signal Analog IO ?

If that's what you need to model a band gap device,
you can also consider a pair of IV curves in the
clamp tables.  Those are always on, whether the
model drives or receives, and you can make a
voltage divider with two appropriately shaped and
sized IV curves.

Arpad
===================================================

-----Original Message-----
From: Tom Dagostino [mailto:tom@teraspeed.com]
Sent: Wednesday, August 17, 2005 9:34 AM
To: Lars Snith; Muranyi, Arpad
Cc: ibis-users@eda.org
Subject: RE: [IBIS-Users] Mixed-Signal Analog IO ?

...
...
...
For a voltage output like the output of a band gap reference make a voltage
divider using a terminator model whose values give you the Thevenin
equivalent for the output impedance of the part you are trying to model.

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