Subject: re: [IBIS] waveform fixtures for differential models
From: Lynne Green (lgreen@cadence.com)
Date: Mon Sep 29 2003 - 14:41:29 PDT
Hi, Mike-
This should work fine in Cadence SPECCTRAQuest.
- Lynne
Dr. Lynne Green
Senior Member of Consulting Staff
Cadence Design Systems, Inc.
"All the world's an analog stage, whereon digital plays bit parts."
Fred Field, Hughes Aircraft
---Original Message-----
From: Mike LaBonte [mailto:milabont@cisco.com]
Sent: Monday, September 29, 2003 4:34 PM
To: IBIS
Subject: [IBIS] waveform fixtures for differential models
We have encountered IBIS models with only 1 rising and 1 falling
waveform, each with V_fixture set to 1/2 of power voltage. These are for
differential buffers where the termination voltage is effectively the
midpoint, so it seems to make sense. My question is, will all IBIS
simulators simulate this model correctly? Or are there simulators that
absolutely require waveforms with V_fixture at both power and ground
levels?
Mike LaBonte
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