I also read Howard Johnson's articles very often. Indeed, his comments on
returning signal current path is very useful to avoid crosstalk problems.
I used Quad XTK/TLC tool before. Based on my understanding, it takes care of
split planes problems but not the effects of adding bypass between power planes.
______________________________ Reply Separator _________________________________
Subject: [SI-LIST] : Power-plane resonance article
Author: Ray Anderson <raymonda@radium.Eng.Sun.COM> at INTERNET
Date: 1998/9/10 01:48 PM
I've just read the Signal Integrity column by Howard Johnson that
was recently (Sept. 1 '98) published in EDN magazine and wanted to congratulate
Howard on his timely article and to suggest that others on the list who haven't
had an opportunity to read his comments should make it a point to look it over.
His comments hit close to home as I've seen examples of many of the
effects he describes. The article is light on theory, but very strong on
As our systems in the industry keep pushing the envelope with faster
risetimes and higher clock speeds it will become imperative that designers
pay close attention to the power distribution system in their products. In
this case the "power distribution system" is not just the silver box you plug
into the wall, but includes the power supply, the bulk capacitors, the bypass
capacitors, the power planes, and even the chip package.
As a matter of curiosity I was wondering how many of the si-list
involved with high performance systems are currently modeling the effects of the
power distribution system in their design work. Any comments why or why not ?
What kind of tools do you use ? Difficulties encountered ?
Sun Microsystems Inc.
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