Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: quoted-printable To all,=20 This is a great question. I too would also like to know this answer. I have seen stackups that are an asymmetric stripline (Split Plane - Signal - Ground) where the signal (5mil trace) is 3.5 mils from the ground and 10 mils from the split plane. If the signal is considered high speed then does 100% of the return go to the closest ground plane or is a small percentage of the return going to the split plane? If not all of the return is to the ground plane then how do you quantify how much is not? Thanks Tony Cosentino -- Binary/unsupported file stripped by Ecartis -- -- Type: image/jpeg -- File: Notebook.jpg -- Desc: Notebook.jpg ------------------------------------------------------------------ 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