[SI-LIST] Re: Skew and Jitter
- From: "Todd Westerhoff" <twesterh@xxxxxxxxx>
- To: <si-list@xxxxxxxxxxxxx>
- Date: Mon, 31 Mar 2003 10:28:09 -0500
IBIS simulates output behavior only, it doesn't try to predict the behavior
through the part in question. If you can simulate the pieces of your chain
individually and then sum the jitter contributions from the pieces, IBIS may
work for you.
Eye diagrams and IBIS are a special discussion in their own right. You
should be aware that rising and falling waveforms are usually extracted
independently for IBIS mnodels, and that "time 0" in the waveform tables is
not necessarily meaningful (as in, it might be the time the output starts to
switch, and it might not). If you're going to run pattern simulations and
look at eye-digrams using IBIS models, you need to be sure that "time 0" is
correlated across the rising and fallinng waveform table data. If it isn't,
you could be making assumptions that aren't necessarily valid.
If you have the time and resources to do so, it's worthwhile to study the
problem using both Spice and IBIS models initially, then move over to IBIS
if you find good correlation between the two approaches.
Todd.
Todd Westerhoff
High Speed Design Specialist
Cisco Systems
1414 Massachusetts Ave - Boxboro, MA - 01719
email:twesterh@xxxxxxxxx
ph: 978-936-2149
============================================
"When did the choices get so hard, with so much more at stake?
Life gets mighty precious when there's less of it to waste"
- Bonnie Raitt, "Nick of Time"
-----Original Message-----
From: si-list-bounce@xxxxxxxxxxxxx
[mailto:si-list-bounce@xxxxxxxxxxxxx]On Behalf Of SI Eng
Sent: Sunday, March 30, 2003 9:39 PM
To: si-list@xxxxxxxxxxxxx
Subject: [SI-LIST] Skew and Jitter
Gurus :
How does one determine the eye diagram at a receiver from simulation using
IBIS models, when there are multiple devices in the path from the driver ?
Each device in the path will contribute to the jitter and skew which will
affect the quality of the eye at the receiver. Does this need to be done
using Spice ?
Thanks,
Douglas
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