Vani- See pages 16 and 17 of the paper entitled "Mixed Mode Scattering Parameters" by Pat Zabinski of Mayo.edu which is found at the following URL:=20 http://si-list.org/files/tech_files/MixedModeSParams_SiList.pdf It provides an example and explanation of what you are trying to do. -Ray Raymond Anderson Senior Signal Integrity Staff Engineer Product Technology Department Advanced Package R&D Xilinx Inc. -----Original Message----- From: si-list-bounce@xxxxxxxxxxxxx [mailto:si-list-bounce@xxxxxxxxxxxxx] On Behalf Of vani.chandrasekharan@xxxxxxxxx Sent: Thursday, July 28, 2005 8:06 AM To: si-list@xxxxxxxxxxxxx Subject: [SI-LIST] [SI-LIST]network analysis of differential signal using hspice =3D0D Hi All, I am tring to use the .net option in the ac analysis in hspice for measuring differential s-parameters. Can anybody tell me how am I to specify the ports and what needs to be done to obtain proper results in differential case!?! Thanks and warm regards Vani ------------------------------------------------------------------ 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