Vod and Differential Models

Subject: Vod and Differential Models
From: Adam.Tambone@fairchildsemi.com
Date: Tue Jul 24 2001 - 12:40:33 PDT

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Hello IBIS Gurus,

I am attempting to understand the following problem.

Simulating the below differential network in HSPICE, with IBIS models for
driver and receiver, and lossless t-element t-lines, Vod is too small.
As opposed to this, simulating the same differential network in HSPICE,
with the HSPICE netlists of the driver and receiver, Vod is correct.
I am expecting to have a Vod of about 350mV.

Can anyone explain this discrepancy?

SIMULATION CONDITIONS

|\---------O=====O---------|---------------------|\
| \ Zo = 50 \ | \
| \ / Rterm = 100 | \
| / \ |
/
|/O-------O=====O---------|-------------------O|/
                Zo = 50

DRVR RCVR

SPICE TO IBIS CONDITIONS FOR OUTPUT BUFFER EXTRACTION

                    _________ + Vfix - __ GND
                    |
                   Rfix = 1MEG
                    |
|\-------------|
| \ R1 = 50
| \ |------------------ | +
| / R2 = 50 Vos = 1.25V
|/O----------| | -
                                            GND

DRVR

Thank You,
Adam Tambone

(See attached file: fin1017m.ibs)

• application/octet-stream attachment: fin1017m.ibs

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