Good point Scott. I remember a case many years ago ( before I understood the folly in such endeavors) where I created a huge PEEC model of a power plane (with tens of thousands of mutually coupled inductors) where I just couldn't get the simulation to converge. Found a single node (out of thousands and thousands) in the model subcircuit that was shorted to ground. Turns out that the error message emitted by Hspice (version 95 or 96 I think) were worse than useless in that they were misleading. -Ray >One more possibility: > >Sometimes convergence problems will occur when >Ansoft package models do not have the correct connections >made to power and ground. > >Be sure that power and ground pass through the model >and have different names on the die side of the model. >Many people mistakenly (or inadvertently) tie both the >die side and the pin side of the model to ground. This can >cause all sorts of convergence problems due to the shorted >loop. > > >regards, > >scott ------------------------------------------------------------------ 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