Hi, I have a querry regarding how to ensure that the impedance of the via is the same as that of the traces. For example, if I have a trace of 50 ohms running between two layers through a via, how can I calculate its impedance? In Specctraquest, I saw that there is a field solver that generates a model for the via based on its geometry and uses it for simulation. Does it also gives the impedance of the via and provides help to achieve the required via impedance? Regards, G.Srinivasan. ------------------------------------------------------------------ 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