On Mar 26, "Todd Westerhoff" <twester@xxxxxxxxxxx> wrote: > > We're currently using two "standard" text fixtures to compare IBIS/HSpice > models: > > * I/O buffer connected to VDDQ/2 through 50 ohms > * I/O buffer connected to 0.5ns, 50ohm tline, 5pf to GND at tline end Do you use HSPICE simulator for both simulations (with IBIS and HSPICE models), or you use some other simulator with the IBIS model? The reason I ask, I think not all simulators have the same way of handling IBIS models. In one case, I used an IBIS model of a true differential CML driver with no problems in SPECCTRAQuest but the model failed to run in HSPICE. As to your first test fixture, I'd recommend using a load other than 50ohm. Some IBIS models work fine when terminated with 50ohms but break for any other loads. This has something to do with the way the models were generated. Regards. Hassan. ------------------------------------------------------------------ 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: http://www.freelists.org/webpage/si-list For help: si-list-request@xxxxxxxxxxxxx with 'help' in the Subject field List archives are viewable at: http://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