Hi Ken, There are some hints in Appendix A of "DF/SigNoise User Guide". According to this (only I have an old version, 10.0), name of subckt represents as follows; VIA_A_VIA_25C17CSM_L1A0W600L27A-135W300_FST_4978 A: Drawing name VIA_25C17CSM: Padstack name L1: Start layer A0: Line angle W600: Line width (design unit) L27: End layer A-135: Line angle (-135degree) W300: Line width and via model has geometry informations. By default, SPECCTRAQuest uses "closed form" equivalent circuit for via, however you can use EM solved model for via by clicking "Solve" button with selecting via model in model browser. Though I have never userd this function, this is my $0.02. Regards, //// /// // / / / / / / / / / / Tadashi Arai//Platform Developing Dept.,Desktop Prd Div. Fujitsu Limited arap@xxxxxxxxxxxxxx TEL:+81-42-370-7624 Inagi-shi, Tokyo, Japan / / / / / / / / / / / // /// On Thu, 14 Mar 2002 16:18:45 -0500 "Ken Beach" <kenbeach@xxxxxxxxxxxxxxxxxx> wrote: > > > Hi, > > I have a question regarding the meaning of the Signal Explorer net list > model for a via. The model definition is immediately below: > > .subckt VIA_A_VIA_25C17CSM_L1A0W600L27A-135W300_FST_4978 > +1 2 > CL1A0W600 1 0 2.18755e-13 > CL27A-135W300 2 0 2.18755e-13 > RLL1A0W600_L27A-135W300 1 2 1e-7 L=2.33327e-09 > .ends VIA_A_VIA_25C17CSM_L1A0W600L27A-135W300_FST_4978 > > > I think this model definition is defining a pi network with a 0.218pf > capacitor on the left, a 0.218pf capacitor on the right and a resistor of > 10^-7 in series with a 2.33nH inductor in the arm bridging between nodes 1 > and 2. However, we can't find in, the help manual, a clear description of > the RLL1A0W etc. bridging arm. So, here we are guessing. Does anybody know > what that bridging arm statement is saying? > > Thanks in advance > > Ken > > ------------------------------------------------------------------ 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 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