Hi All, a power net on hdi board ,I find that the 100nf capacitor 's(only one capacitor) resonance frequecy (the capacitor package is 0201)is 38Mhz(test S21 by VNA), rather higher than its normal resonance frequecy 18Mhz(if not consider the parasitic inductor on the pcb borad). Does the pcb board impact the capacitor and the esl of the capacitor become smaller? Can anybody help me in solving this? Regards, sky_of_bj _________________________________________________________________ Ò»ÕÅÕÕƬµÄ×԰סª¡ªWindows LiveÕÕƬµÄ¿É°®ÊÓƵ½éÉÜ http://windowslivesky.spaces.live.com/blog/cns!5892B6048E2498BD!889.entry ------------------------------------------------------------------ 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 technical documents are available at: http://www.si-list.net List archives are viewable at: //www.freelists.org/archives/si-list Old (prior to June 6, 2001) list archives are viewable at: http://www.qsl.net/wb6tpu