Interesting articles on your web-site, Tim. >BTW, how about just using a 100 pF capacitor with the 'leads' hugging close >to the microprocessor package
There's a "mile" from the Vcc pin to ground, that's another problem. No ground plane, only ground traces which is routed around on the PCB. This product is soon leaving this world (it's an old product), but we are trying to let it exits a few more months before a new version is released. New emission requirements (24dBuV/m @ 3m, freq.band 155MHz-165MHz) might let it die very soon .... Amund -----Opprinnelig melding----- Fra: Wan Juang Foo [mailto:f...@np.edu.sg] Sendt: 18. april 2002 10:01 Til: am...@westin-emission.no; emc-p...@majordomo.ieee.org Emne: Re: Decoupling - capacitor values Amund, In the absence of any layout information that can evaluate the loop inductances, I suggest you read what I wrote about placing two capacitor in parallel which can be found on Chapter 3 of my thesis. A link is available in: http://www.geocities.com/timfoo6143/index.html BTW, how about just using a 100 pF capacitor with the 'leads' hugging close to the microprocessor package. i.e. assuming you are using a leaded capacitor (on say a QFP). :-) Tim Foo ------------------------------------------- This message is from the IEEE EMC Society Product Safety Technical Committee emc-pstc discussion list. Visit our web site at: http://www.ewh.ieee.org/soc/emcs/pstc/ To cancel your subscription, send mail to: majord...@ieee.org with the single line: unsubscribe emc-pstc For help, send mail to the list administrators: Ron Pickard: emc-p...@hypercom.com Dave Heald: davehe...@attbi.com For policy questions, send mail to: Richard Nute: ri...@ieee.org Jim Bacher: j.bac...@ieee.org All emc-pstc postings are archived and searchable on the web at: http://ieeepstc.mindcruiser.com/ Click on "browse" and then "emc-pstc mailing list"
