Dear Zhangkun: What tool did you use for your power noise simulations? How close (relative to the associated component) did you place the decoupling caps? Thank you. Abe -----Original Message----- From: Zhangkun [SMTP:zhang_kun@xxxxxxxxxx] Sent: Monday, August 04, 2003 8:58 PM To: si-list@xxxxxxxxxxxxx Subject: [SI-LIST] Re: UltraCAD ESR and Bypass Capacitor Caculator Dear All: In our simulation and measurement, we found that power noise of at least 400MHz could be decoupled by discrete caps. The placement DOES matter the impedance of PDS. The current problem is the anti-resonance between different kinds of caps. Best Regards Zhangkun -- Binary/unsupported file stripped by Ecartis -- -- Type: application/ms-tnef ------------------------------------------------------------------ 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 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