FreeLists / si-list / [SI-LIST] SpecctraQuest Convergence Issue

[James_R_Jones@xxxxxxxx]

Gurus,

I was interested in learning more about the convergence issues in
SpecctraQuest.  I get quite a few of these when I simulate, with severity
ranging from "Serious Convergence Error", to "jagged" waveforms, to no
convergence problem at all.  Does anyone have a good understanding of what
causes these convergence issues and how to prevent them?

A couple of theories that I have heard so far include:

1.  Spectral content resonating back and forth along transmission line
segments that is aliased back as noise causing the "jagged' waveforms.

2. Simulator is confused, particularly during design link, by reference
designators and makes 'mistakes' in handling topology.

Has anyone done work in this area to determine the cause of these
convergence issues?   Any help is appreciated.

Thanks in advance,

James R. Jones
ESG Signal Integrity
Dell Computer Corporation
(512) 725-1809


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