> My understanding for voltage and current controlled sources in SPICE are > they are passive and linear. They will not change S parameter simulation > defined by P elements using different ac and dc options in P elements. If I'm not mistaken, even SPICE2 had nonlinear controlled sources using the normal E, F, G, and H elements, though it was somewhat difficult to specify them when they weren't linear. Many commercial circuit simulation programs were based on SPICE2. Andy ------------------------------------------------------------------ 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