Re: [SI-LIST] : What's your favourite Screwy SI Concept?

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From: Mark Randol (m.randol@motorola.com)
Date: Mon Jan 10 2000 - 14:53:46 PST


Chris Heard wrote:
>
> Here's another...
>
> Use a ground trace in between signal traces to reduce crosstalk....

That CAN work, but it has to really be "ground", not just a piece
of metal that might have a "ground" connection somewhere.
Otherwise, you've just made 2 2X+ larger value capacitances in
series rather than 2 capacitances to "ground" as you intended.
So you've actually made things worse.

That is, 2.1*C0 || 2.1*C0 = 1.05*C0.

Properly stitched with vias, it can work quite well at
RF/microwave frequencies.

-- 
Mark Randol, RF Measurements Engineer
Motorola SPS, Inc.
M/S EL381
2100 E. Elliot Road
Tempe, AZ 85284
(480)413-8052 Voice
(480)413-3455 FAX
M.Randol@motorola.com

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