Re: PCB Design

From: John Woodgate (jmw_at_jmwa.demon.contraspam.yuk)
Date: 08/09/04 

Date: Mon, 9 Aug 2004 17:34:18 +0100

I read in sci.electronics.design that Anders F <af-spam@hi5.dk> wrote
(in <2nphgjF38i5bU1@uni-berlin.de>) about 'PCB Design', on Mon, 9 Aug
2004:
>Then the "details" like actual numbers and values, that's scary.
>Presently I'm primarily a bit puzzled about the effect of caps above
>their resonance frequency. I mean they'll still exhibit low impedance -
>but wont be able to supply any charge as they'll be primarily
>inductive...

Well, maybe not inductive. Through-hole caps do go significantly
inductive, especially values above 1000 pF. But capacitors specifically
designed for low inductance, and possibly some stock SMD parts, tend to
a *constant* impedance above the series resonant frequency, indicating a
mainly *resistive* impedance. 

-- 
Regards, John Woodgate, OOO - Own Opinions Only. 
The good news is that nothing is compulsory.
The bad news is that everything is prohibited.
http://www.jmwa.demon.co.uk Also see http://www.isce.org.uk

Relevant Pages