RE: [IBIS-Users] Differential V-I bench measurement

Bryan

We do this all the time.

From your description you want to have the final model have a floating 100
Ohm termination. The best way to achieve this is to model the termination
as a series resistor between the two inputs. You then model the inputs
without any resistance between them making sure when you measure them you
don't pass any current in the resistor. You use the Diff Pin table to
connect the two inputs as a differential pair. You use the Series Pin
Mapping to place the termination between the two inputs. And use a R Series
as the termination.

Arpad came up with another method to do this using multiple IV tables but
I'm not sure how much support there is in simulators for this. See the IBIS
archives for details.

Tom Dagostino

Teraspeed Labs

13610 SW Harness Lane

Beaverton, OR 97008

503-430-1065

tom@teraspeed.com

www.teraspeed.com

Teraspeed Consulting Group LLC

121 North River Drive
Narragansett, RI 02882

401-284-1827

www.teraspeed.com

From: owner-ibis-users@eda.org [mailto:owner-ibis-users@eda.org] On Behalf
Of Fraser, Bryan
Sent: Friday, September 10, 2010 3:03 PM
To: ibis-users@eda-stds.org
Subject: [IBIS-Users] Differential V-I bench measurement

I'm working on creating my first ibis model based on bench data and was
wondering if anyone might be able to help.

How would you make the V-I measurement on a differential input with pure
differential on chip termination.

I've read the cookbook. and it doesn't really explain how to do this on the
bench.

Thanks,

Bryan

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