Subject: RE: High frequency performance of IBIS model
From: Mellitz, Richard (richard.mellitz@intel.com)
Date: Fri Oct 19 2001 - 13:57:25 PDT
When the return loss of the buffer over the required frequency range is
relatively flat, db-log(f) linear (3-6 db/octave) , or small IBIS will be
suffucient.
...Rich
-----Original Message-----
From: Muranyi, Arpad [mailto:arpad.muranyi@intel.com]
Sent: Friday, October 19, 2001 3:53 PM
To: ibis-users@eda.org
Subject: RE: High frequency performance of IBIS model
IBIS models have only a constant capacitance to account for
the die capacitance, which means that there is no frequency
dependency in their impedance. If the value is correct at
your frequency I think you could still use it, but if you
need frequency dependency you may need to find other ways.
I don't know if you are also planning to using the IBIS file
for describing the package for your device, but the IBIS
package parameters only use RLC (no G) and none of these are
frequency dependent either.
Arpad Muranyi
Intel Corporation
============================================================
-----Original Message-----
From: Chao Su [mailto:csu@nortelnetworks.com]
Sent: Friday, October 19, 2001 12:41 PM
To: ibis-users@eda.org
Subject: High frequency performance of IBIS model
Hi,
I'm working in signal integrity of optical transceivers. I'm considering of
using IBIS model for my simulation, our optical transciever is operated at
2.5Gb/s. Somebody told me that IBIS model is not good to predict high
frequency behavior for the device. I would like you can give me advice about
what issue I need to concern when I get my IBIS model from vendors and how I
can make sure the model is good in high frequency simulations.
Thanks
Chao Su
Optical Systems Design (Dept. QF11)
Nortel Networks
P. O. Box 3511
Station C, Ottawa, ON, K1Y 4H7
Canada
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