RE: [SI-LIST] : Accuracy of HSPICE W-element transmission lines

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From: David Kaiser ([email protected])
Date: Mon Nov 27 2000 - 10:16:50 PST

I have compared the W-element with the RLGC matrix from running APSIM on 100
Ohm diff'l pairs). With a 30ps pulse and 10ps rise times, the reflected
pulse was very symetrical for the W-element, but showed and RC roll off with
APSIM. The APSIM seemed to shown a more realistic reflection pulse.
David Kaiser
McDATA Corp.
310 Interlocken Pkwy.
Broomfield, CO 80021
(303) 460-4431
[email protected]


-----Original Message-----
From: Kai Keskinen [mailto:[email protected]]
Sent: Thursday, November 23, 2000 11:19 AM
To: [email protected]
Subject: [SI-LIST] : Accuracy of HSPICE W-element transmission lines

Hello SI-People:

We have now several times encountered differences in results from other
modelling packages and results from HSPICE w-element models for applications
involving fairly long striplines > 30cm on FR4 and GETEK with 2.5Gbps
signals with ~100ps edge rates. The W-element model appears to give lower
loss than the other techniques. Typical track widths are 6-8 mils with
100Ohm loosely coupled differential pairs.

Avant! claims the W-element method is accurate without providing a paper
showing how it was validated.

How does the rest of the SI community feel about the accuracy of the
W-element model?

Thanks in advance,

Kai Keskinen
Equipment and Network Interconnect
Nortel Subsystems and Performance Networks (NSPaN)
(613)-765-3506 (ESN 395)
[email protected]

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