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

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From: Douglas C. Smith (doug@dsmith.org)
Date: Wed Dec 22 1999 - 19:50:54 PST


Hi Jon and All,

When you drive through a capacitor you are basically differentiating
the signal. The receivers will become more sensitive to noise. A small
noise pulse will be integrated into a signal. It would be more
difficult to distinguish a real signal from one due to, for instance,
ESD.

Doug

Jon Powell wrote:
>
> 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
>
> --
> Jon Powell
> Director of HSSD Consulting Services
> Viewlogic Systems, INC.
> 805 988 8250
>
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