RE: [IBIS-Users] IBIS model check

So effectively, in the absence of either spice curves or measurement data,
I'm stuck with no way of verifying the IBIS model?

Indira.

-----Original Message-----
From: Dekker Graden [mailto:dekker@teraspeed.com]
Sent: Wednesday, August 17, 2005 11:27 AM
To: Indira Gazula
Subject: Re: [IBIS-Users] IBIS model check


There are a couple of methods for checking.

One is using the spice for the same part and seeing if the IV and VT
curves match up.

The other way is to take a real part and perform some measurements on
it. Then conpair the measurement results to the IBIS file to see how
closely they match up.

Dekker

Indira Gazula wrote:

>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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