Bipin- One could also try one of the "freeware" tools that calculate Z0, Td, v, etc. Links to these tools can be found on the IBIS Tools page. http://www.eigroup.org/ibis/tools.htm - Lynne "IBIS training when you need it, where you need it." Dr. Lynne Green Green Streak Programs http://www.greenstreakprograms.com 425-788-0412 lgreen22@xxxxxxxxxxxxxx -----Original Message----- From: si-list-bounce@xxxxxxxxxxxxx [mailto:si-list-bounce@xxxxxxxxxxxxx] On Behalf Of Bipin Dhavale Sent: Wednesday, September 29, 2004 3:13 AM To: si-list@xxxxxxxxxxxxx Subject: [SI-LIST] Propagation delay on embedded microstrip Hi Everyone, In the stackup shown below what propagation delay should I consider in Signal Layer S1 ? ---------------Top (Signal) ---------------S1(Signal) ---------------Plane(Pwr or gnd) Thickness between Top to S1 is equal to S1 to Plane What would be the best assumption ? a] Microstrip b] Close to microstrip c] Stripline d] Close to stripline e] Inbetween stripline & microstrip Also If i consider S1 layer as deeply embedded (S1 to Plane >>> Top to S1) Can I safely consider propagation delays in layer S1 as close to stripline ? Thank you, Bipin ------------------------------------------------------------------ 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