There are people who are seriously modeling ground return resistance/loss. These people are dealing with SI effects on chips, rather than on boards, and so they usually publish in integrated-circuit journals. Sorry I am not up to date with this enough to recommend where to start reading, but I do remember seeing presentations on this about 3-4 years ago. - Lynne ------------------------------------------------------------------ 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