In message <[email protected]>, dated Wed, 16 Apr 2008, Brian O'Connell <[email protected]> writes:
>welllll, I borrowed the Pressman book from one of the design engineers, >and it seems to indicate that a decoupling action is, in fact, a hi-Z >action. There is always the possibility that someone in the distant past used the term 'decoupling' incorrectly, and the error has persisted. Elementary thinking is 'voltage-mode' and so if you wanted to 'decouple' (reduce coupling) you would include a high series impedance (but the term 'decouple' isn't, as far as I know, commonly used in that context). Shunt capacitors live in the 'current-mode' world, where you reduce coupling by adding low impedance to earth/ground. -- OOO - Own Opinions Only. Try www.jmwa.demon.co.uk and www.isce.org.uk Murphy's Law has now been officially re-named The Certainty Principle John Woodgate, J M Woodgate and Associates, Rayleigh, Essex UK - This message is from the IEEE Product Safety Engineering Society emc-pstc discussion list. Website: http://www.ieee-pses.org/ To post a message to the list, send your e-mail to [email protected] Instructions: http://listserv.ieee.org/request/user-guide.html List rules: http://www.ieee-pses.org/listrules.html For help, send mail to the list administrators: Scott Douglas [email protected] Mike Cantwell [email protected] For policy questions, send mail to: Jim Bacher: [email protected] David Heald: [email protected] All emc-pstc postings are archived and searchable on the web at: http://www.ieeecommunities.org/emc-pstc
