Srivats- Using the physical characteristics on the RG400U data sheet: http://www.repic.co.jp/contents/products/huber/seihin/rf/pdf/rg400u.pdf and the procedure describe in the following paper by Richard Wheeler: http://www.wheeler.com/technology/technicalpaper2/technicalpaper2.pdf you should be able to synthesize a spice (or other simulator) compatible model that accounts for loss as well as impedance. With a little thought you could probable back the RLGC parameters out of the data as well. If you have access to Agilent LineCalc or the field solver in Hspice (or other similar field solver) you can create a model from the physical dimensions and material properties. Or you could measure the cable with either a VNA or a TDR and synthesize a model from the measured data (or use the s-parameters directly). Lots of possibilities, the details are left to the interested student..... -Ray Xilinx Inc. -----Original Message----- From: si-list-bounce@xxxxxxxxxxxxx [mailto:si-list-bounce@xxxxxxxxxxxxx] On Behalf Of Srivats Partha Sent: Monday, July 09, 2007 2:35 PM To: si-list@xxxxxxxxxxxxx Subject: [SI-LIST] Modeling Cable Hello Gurus I have a pasternac RG 400/U cable. We are using this to hook a 3 ghz scope to a CDM ESD tester. I want to model this cable in Cadence environment . I have used the LMG tool in cadence previously , it does not seem to have a option to model co axial cable, the tool has options to model only a strip line, micro stripline , CPW and a sub loss line. Under what category should I put this RG 400/U cable , Is it a coaxial cable? If so any hints on generating a RLCG matrix for this cable so that I could plug into the MTLINE model in spectre environment and use it for simulations? else any suggestions on how I should go about modeling this structure? Regards Srivats =20 -- I have no special talents. I am only passionately curious. AE ------------------------------------------------------------------ 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 technical documents are available at: http://www.si-list.net 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