Hello James, I don't think there is an officially sanctioned, accurate model around (the earliest Teradyne VLSI tester I know for sure a model exists for is the J973, and even that one does not really model e.g. path losses). But for the speed/bandwidth range the J971 works at it isn't too difficult to build your own. It also depends what the goal of the model is - I assume to model the load your DUT experiences? In this case, set the J971 channel to the desired state (termination method etc.), then use a TDR-capable scope to obtain a TDR profile. (be careful when terminating the channel with some non-zero voltage, don't overload the TDR driver; thus you may want to use a DC block between TDR instrument and tester input). From this profile you can then generate an equivalent model using some software tool like Tektronix iConnect or similar. I can help with that as well, I have some tool to half-manually create models consisting of limited numbers of discrete components (Cs, Ls, Rs, transmission lines etc.) that you can then easily use in PSpice, LTSpice or similar simulators; again, the basis for model creation would be a TDR plot. Feel free to contact me directly about that. Many more advanced simulation tools accept S-parameter files, in this case a VNA is a good alternative to the TDR to produce input data, although that gives only a "black box" model with little insight into channel behavior, wheras a TDR lets you pinpoint the characteristics, locations and sizes of any "troublemakers". (higher-end VNAs often have a TDR option - basically real-time FFT - to produce TDR plots from the S parameter sweeps). That said, a first order model for most test applications would simply be a 50-Ohm transmission line with possibly some termination (resistive, diode clamps, active load); the main parameter to determine here would be the line length / prop delay (or not even that if the termination is matched 50 Ohms), you may be able to get that from the tester's data sheet. For old, relatively low-data-rate testers like the J971 that's probably sufficient for 99% of your applications. Channel-to-channel differences are much more significant than the relatively minor contributions of vias, relays etc. inside the tester. Wolfgang -----Original Message----- From: si-list-bounce@xxxxxxxxxxxxx [mailto:si-list-bounce@xxxxxxxxxxxxx] On Behalf Of Church, James Sent: Thursday, December 01, 2011 5:59 PM To: si-list@xxxxxxxxxxxxx Subject: [SI-LIST] Interconnect Model for J971 (100MHz) Teradyne Does anyone have an interconnect model lying about for a J971 Teradyne VLSI Tester (circa 1995)? Generating my own will take some time. Regards, James Church Rockville Design Center Rochester Electronics, Inc. ------------------------------------------------------------------ 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 Old (prior to June 6, 2001) list archives are viewable at: http://www.qsl.net/wb6tpu ------------------------------------------------------------------ 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 Old (prior to June 6, 2001) list archives are viewable at: http://www.qsl.net/wb6tpu