Hi Ahmed,
Have you consulted the IBIS Cookbook at http://ibis.org/cookbook/? Chapter 4 ;
covers extraction of differential buffers, and is quite comprehensive. For
differential buffers without on-die termination you need a test fixture with
termination, and the extracted model is valid for that termination scenario.
The cookbook describes that and more.
Mike
From: ibis-users-bounce@xxxxxxxxxxxxx
[mailto:ibis-users-bounce@xxxxxxxxxxxxx] On Behalf Of Ahmed Essam
Sent: Thursday, April 21, 2016 5:19 AM
To: ibis@xxxxxxxxxxxxx; ibis-users@xxxxxxxxxxxxx
Subject: [ibis-users] IBIS model for differential buffers
Hi All,
i just started learning about ibis models and i want to make an ibis model
for differential buffer.
i get confused about modeling the differential buffer as a pseudo
differential or true differential.
What i get from my readings about true differential buffer there is a path
for current between pads of buffer.
The buffer that i want to make an ibis model for has no on-die termination
between the 2 pads.but the termination resistance is connected in series
with pull up and pull down devices .
so there is no path for current between the two pads expect for when i
connect a termination resistance between the 2 pads to model the
transmission line impedance.
Shall i consider that buffer as a pseudo differential or as a true
differential buffer?
Thanks,
Ahmed
