Hi all, I am looking for some information on differential via modeling. The differential nets travel through via holes between non-adjacent layers. A return stitch is typically placed near the layer jump via to provide a return path for single-ended nets. With differential pairs, the common-mode signal would need a return path but I am not finding any information on how to calculate the anti-pad size, placement of the vias and return stitch for differential nets.=20 I have been reading Howard Johnson's latest book on via modeling but it only talks about single-ended vias.=20 Can someone provide a good reference source on this issue, thanks. Doug Hopperstad ------------------------------------------------------------------ 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