On Wed, Jun 04, 2003 at 09:34:18AM +0200, Norbert Hoppe wrote: > When selecting parallel caps, it is important to remember that as the larger > value capacitor goes inductive, the smaller value cap is still capacitive. > At a particular frequency, a LC circuit is developed between the 2 caps. > An infinite impedance could be generated with no decoupling benefit provided. > When this occurs, single-capacitor decoupling is all that one can use > for this application.
actually - if you look at ESL graphs for multilayer SMD caps - you will see it depends much more on case size than on capacitance. So the 100n tends to win. This quote I think may be older wisdom for thruhole components. john * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * To post a message: mailto:[EMAIL PROTECTED] * * To leave this list visit: * http://www.techservinc.com/protelusers/leave.html * * Contact the list manager: * mailto:[EMAIL PROTECTED] * * Forum Guidelines Rules: * http://www.techservinc.com/protelusers/forumrules.html * * Browse or Search previous postings: * http://www.mail-archive.com/[EMAIL PROTECTED] * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
