RE: [IBIS-Users] Question about modeling a differential output driver

Hello, Wei,
 
The VI tables must have end points at -Vcc and +2Vcc to pass the parser.
The VI tables must also match the two DC endpoints for each Vt table.  Both
of these are required by the IBIS parser.
 
The actual I/O table data must cover the range of voltages such that ALL
possible rising and falling reflected voltages are included.  Beyond those
requirements, the table can be extended to meet constraints set by the
parser.
 
You might also want to talk with your tool vendor about what they recommend.
 
Lynne
 
 
"IBIS training when you need it, where you need it."
Next public IBIS seminar is Oct 9-10 in Fremont, CA.
 
Dr. Lynne Green
Green Streak Programs
http://www.greenstreakprograms.com
425-788-0412
lgreen22@mindspring.com


  _____  

From: owner-ibis-users@eda.org [mailto:owner-ibis-users@eda.org] On Behalf
Of Wei Zhang
Sent: Monday, July 28, 2008 2:19 PM
To: ibis-users@eda.org
Subject: [IBIS-Users] Question about modeling a differential output driver


IBIS experts,
 

I have a question about "IBIS Modeling Cookbook for IBIS Version 4.0" and a
presentation refered in it: "Details on True Differential Buffer
Characterization Revisited." 
 
In this presentation, the driver is characterized for Vp=0~1.8V and
Vn=0~1.8V with power supply @ 1.8V.
 
My question is that whether I shall run the simulation for -1.8V to +3.6V
according to IBIS v4.2? The spec requires [Pullup] and [Pulldown] tables to
be specified for -vcc to 2*vcc, which is -1.8V ~ +3.6V in this case.
 
Or, shall I assume that the series [Model] is only extracted for voltages
from 0 ~ 1.8V and the rest (common-mode models) still have tables ranging
from -1.8V to +3.6V?
 
thanks,
Wei
 

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