Hi Wee Mei, You can find Dr. Jin Zhao's paper " Effects of power/ground via distribution on the power/ground performance of C4/BGA packages" at http://www.sigrity.com/support_tech_doc.htm You may also check out the following papers; 1. Titled "Shorting Via Arrays for the Elimination of Package Resonance to Reduce Power Supply Noise in Multi-layered Area-Array IC Packages" presented at 1998 IEEE Symposium on IC/Package Design Integration. 2. Titled "Significance of Electromagnetic Coupling Through Vias in Electronics Packaging" in the Proceeding of 1997 IEEE 6th Topical Meeting on EPEP conference. 3. Tilted " Via and Return Path Discontinuity Impact on High Speed Digital Signal Quality" -- by Qinglun Chen, Intel, EPEP Conf., October 2000 The link to the paper 1 and 2 at http://www.sigrity.com/support_tech_doc.htm and the paper #3 at http://www.sigrity.com/support_cus_doc.htm Best Regards Winson Yu -----Original Message----- From: si-list-bounce@xxxxxxxxxxxxx [mailto:si-list-bounce@xxxxxxxxxxxxx]On Behalf Of Zhou, Xingling (Mick) Sent: Thursday, January 24, 2002 4:21 PM To: 'lweemei@xxxxxxxxxx'; si-list@xxxxxxxxxxxxx Subject: [SI-LIST] Re: Effect of vias on Ground performance I know a paper by Jin Zhao etc. in the Proceedings of the 7th topical meeting on electrical performance of electronic packaging, Oct., 1998. The title is " Effects of power/ground via distribution on the power/ground performance of C4/BGA packages". It provides some information. Regards. Mick -----Original Message----- From: fullname [mailto:lweemei@xxxxxxxxxx] Sent: Thursday, January 24, 2002 6:47 PM To: si-list@xxxxxxxxxxxxx Subject: [SI-LIST] Effect of vias on Ground performance I was asked to check what is the effect of vias on ground performance. Any kind souls out there can provide me with some information or references for me? Thanks and regards - Wee Mei ------------------------------------------------------------------ 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 ------------------------------------------------------------------ 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 ------------------------------------------------------------------ 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