RE: [SI-LIST] : board-level simulation for differential signals

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From: Weston Beal (weston_beal@mentorg.com)
Date: Thu Apr 13 2000 - 09:23:32 PDT


Daniel,

I have simulated differential signals in IS. I suspect that XTK and HSPICE
have the same issues. Your driver and receiver should be defined as
differential, but also the nets should be defined as differential pairs in
order to account for coupling. This is an important factor in differential
signaling. If you use MultiDriverContention simulation in XTK, it might not
be including coupling. In an HSPICE simulation you would need to make sure
that you use a coupled transmission line model.

Good luck,
Weston

-----Original Message-----
From: owner-si-list@silab.eng.sun.com
[mailto:owner-si-list@silab.eng.sun.com]On Behalf Of Daniel Wei
Sent: Thursday, April 13, 2000 4:45 AM
To: 'si-list@silab.eng.sun.com'
Subject: [SI-LIST] : board-level simulation for differential signals

Hi,

Does anyone have the experience in simulating differential signals by QUAD,
HSPICE, or IS ?
I appreciate any suggestion or experience.

However, I had simulated differential signals by QUAD, but there are two
ways to do it.
One method is to simulate by defining Differential Driver and Receiver PINs,
another method is by defining Multi-Driver Control file.
And I found that the results of the above two methods are not the same
(waveform and timing).
Note that the driver model had been adjusted to make both pull-up and
pull-down symmetric.
What make them different ?

If you had the HSPICE simulation experiences, which model did you use ?
Or do you have the IS experience ?

Thanks a million.

Regards,

Daniel Wei

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