From: David Kaiser (firstname.lastname@example.org)
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.
310 Interlocken Pkwy.
Broomfield, CO 80021
From: Kai Keskinen [mailto:email@example.com]
Sent: Thursday, November 23, 2000 11:19 AM
Subject: [SI-LIST] : Accuracy of HSPICE W-element transmission lines
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
Thanks in advance,
Equipment and Network Interconnect
Nortel Subsystems and Performance Networks (NSPaN)
(613)-765-3506 (ESN 395)
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