RE: [SI-LIST] : Plane Capacitance

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From: Aubrey_Sparkman@Dell.com
Date: Wed Nov 10 1999 - 14:28:34 PST


>From: Doug Brooks [mailto:doug@eskimo.com]
>At 12:16 PM 11/9/99 -0500, you wrote:
>>When using power/ground planes as capacitors for decoupling, decreasing
the
>>distance between them increases the capacitance. Is there any reason why
you
>>should not use the minimum possible spacing? In other words, is it
possible to
>>have too much capacitance? How low can resonance occur? (Disregard, cost
and
>>manufacturing issues.)
>
>Absent fab cost, it's hard to imagine "too much" capacitance can be made
>available in a practical sense. I wish we all could ignore fab cost!

Hmm.. Once, long ago, I was in a place once where we had too much
capacitance -- or not enough inductance! When we turned the circuit on, the
inrush of current welded the switch shut.

Aubrey Sparkman
Signal Integrity
Aubrey_Sparkman@Dell.com
(512) 723-3592



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