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From: Jim Weir
Subject: Re: Bypass capacitor position
Date: Fri, 25 Oct 2002 10:39:08 -0700
Organization: RST Engineering
X-Newsreader: Forte Agent 1.91/32.564
shared these priceless pearls of wisdom:
One trick we RFers sometimes use if we just HAVE to have the bypass capacitor
with relatively long pcb traces is to assume (terrible word) that a standard 30
mil trace will have an inductance of about 20 nh per inch of pcb trace. Figure
the length of BOTH pcb traces and then select a capacitor that will resonate at
the frequency of the pcb trace (plus capacitor package, if you know it)
inductances at your intended frequency.
Then scatter a couple of smaller and larger capacitors about to take care of
very low and very high frequencies as the general rules in the textbooks
->Richard Haendel wrote:
->> Everyone knows that bypass capacitors should be as close as possible to an
->> ic's power and ground leads.
->You have gotten some very good answers, but I haven't seen one
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