David, it is amazing the problems one can solve with a router bit. Steve. At 05:29 PM 9/7/2004 +0100, David Greig wrote: >Hi Girish > >I would hazard a guess that the filter cap is ceramic, and another guess >that it is surface mounted in a mechanically unsupported area of the board. > >Most ceramics exhibit a piezoelectric effect. The value will also alter on >board deflection, in the order of 0.1% to 0.5% of value in the extreme >(before popping off!). > >Film caps do not have a piezoelectric effect. > > >Best Regards > >David Greig >_________________________________________ >Director >GigaDyne Ltd >Buchan House >Carnegie Campus >Dunfermline KY11 8PL >United Kingdom >Tel. +44 (0) 1383 62 49 75 >_________________________________________ > >-----Original Message----- >From: si-list-bounce@xxxxxxxxxxxxx [mailto:si-list-bounce@xxxxxxxxxxxxx] On >Behalf Of Girish Bangalore >Sent: 07 September 2004 17:04 >To: si-list@xxxxxxxxxxxxx >Subject: [SI-LIST] PLL Loop filter > >Hello Friends, > >I need some help in my analysis of a problem listed below, > >I am working on a product for a graphic application using an ADC with a >built-in PLL (clock for digitization of Video). During a vibration test on >the board we found out that the image shakes and we fixed everything we >suspected from loose cable to loose components with no success. Finally, >based on some expert advise.. I was told that the problem could be caused >due to mechanical stress on the loop filter capacitor which may be causing >the capacitance to change during vibration and thereby disrupting the PLL. > >Has anyone faced similar issues? I would appreciate your expert feedback. > >Thanks, > >Girish > >------------------------------------------------------------------ >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 > > >-- >Virus scanned by Lumison. > > >------------------------------------------------------------------ >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