UMR did a paper in 1995 that determined location is not important as long as you don't cut up the power planes. Others have repeated those same tests, as have I, and come up with the same answers. The proponents of location matters need to do some testing to show that their position is valid. Lee Lee W. Ritchey Speeding Edge P. O. Box 2194 Glen Ellen, CA 95442 Phone- 707-568-3983 FAX- 707-568-3504 I just took the energy it took to be angry and wrote some blues. Count Basie > [Original Message] > From: Eric Steimle <steimle@xxxxxxxxxxxxx> > To: <si-list@xxxxxxxxxxxxx> > Date: 4/14/2004 1:59:37 PM > Subject: [SI-LIST] placement of decoupling caps (again) > > I know this has been discussed many times before and so far I have: > > > Read all the Sun papers on the yahoo list > > Read through many papers from AVX on decoupling > > Spent some time searching through the list archives > > And read through many papers suggested in the list archives > > > > So far I've come up with a lot of information on how to choose bypass > caps, how many to use, what kinds, ESL, ESR, but not much on the correct > placement of these bypass caps in a normal system (normal to me would be > a processor some ram and maybe some DAAs or other peripherals). While > combing through the list archives I've seen some people saying location > doesn't matter, while others arguing that it does. So I was hoping that > some people could suggest some further sources of information about > decoupling cap placement that would help me make more informed > decisions. > > > > Thanks in advance > > Eric Steimle > > > > > > ------------------------------------------------------------------ > To unsubscribe from si-list: > si-list-request@xxxxxxxxxxxxx with 'unsubscribe' in the Subject field > > or to administer your membership from a web page, go to: > //www.freelists.org/webpage/si-list > > For help: > si-list-request@xxxxxxxxxxxxx with 'help' in the Subject field > > List FAQ wiki page is located at: > http://si-list.org/wiki/wiki.pl?Si-List_FAQ > > List technical documents are available at: > http://www.si-list.org > > List archives are viewable at: > //www.freelists.org/archives/si-list > or at our remote archives: > http://groups.yahoo.com/group/si-list/messages > Old (prior to June 6, 2001) list archives are viewable at: > http://www.qsl.net/wb6tpu > ------------------------------------------------------------------ To unsubscribe from si-list: si-list-request@xxxxxxxxxxxxx with 'unsubscribe' in the Subject field or to administer your membership from a web page, go to: //www.freelists.org/webpage/si-list For help: si-list-request@xxxxxxxxxxxxx with 'help' in the Subject field List FAQ wiki page is located at: http://si-list.org/wiki/wiki.pl?Si-List_FAQ List technical documents are available at: http://www.si-list.org List archives are viewable at: //www.freelists.org/archives/si-list or at our remote archives: http://groups.yahoo.com/group/si-list/messages Old (prior to June 6, 2001) list archives are viewable at: http://www.qsl.net/wb6tpu