Re: [SI-LIST] : Clean sheet of paper

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From: Jon Powell ([email protected])
Date: Wed Dec 22 1999 - 19:28:51 PST

I saw an interesting paper at an IEEE conference (In Monterey, perhaps
EMC?) a couple of years ago. The author conjectured that the problem
people are having is that everything is dependent on charging a large
capacitor (the TLINE) and we have to get away from this.

His proposal. Make all drivers drive through a large series capacitor.
So the only signal sent it a pulse (+ or -) and you re-integrate the
signal at the receivers (through some simple logic he presented).

A couple of good things:
1) You don't need low-resistive contacts for your pads. Just squares of
metal that sit over top of each other and form the capacitors.
2) You don't have to worry about current content.

Some bad things (that he didn't mention).
1) Crosstalk noise probably gets more critical.
2) Nothing is really "clocked" anymore (hey, maybe this goes in the good
thing category).

Once again, this is not my idea. (but I sort of like it).

regards and Happy Hollidays.

Jon Powell
Director of HSSD Consulting Services
Viewlogic Systems, INC.
805 988 8250

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