Sogo, Some SI simulation tools let you put the device models in current tracking mode instead of voltage mode. This is necessary for proper simulation of things that are current tracking, like ECL. By the way, IBIS doesn't really have this sort of information in it (I don't think). jon -----Original Message----- From: si-list-bounce@xxxxxxxxxxxxx [mailto:si-list-bounce@xxxxxxxxxxxxx]On Behalf Of Sogo Hsu Sent: Wednesday, February 25, 2004 12:11 AM To: si-list@xxxxxxxxxxxxx Subject: [SI-LIST] Current mode current stealing simulation by IBIS file Hi, Gurus, A question regarding current mode current stealing circuit simulation confused me for a long time. The simulation results totally different from the measured as well. To understand the cause of discrepancy, I tried to set up two kinds of circuit, one is voltage mode and the other one is current mode. In general, IBIS file describe the v/t curves of I/O cell with test feature. We can easily generate the same v/t curve for these two. However, the Spice simulation indicated the results are totally different if the whole link is under considered. The behavior of current mode spice model is similar with the measured. In my opinion, this phenomenon can be analog to TE and TM mode. Therefore, the refection condition is definitely different even they have owned same v/t curve in IBIS file. My question is, how we overcome this issue if we only use IBIS file for simulation. In general, we can only get IBIS files from vendors. Can any expert on this topic share the experience to me? Thank you in advance. Best regards, Sogo Hsu, Ph. D. Simulation center/PCEG/Foxconn Electronic ------------------------------------------------------------------ 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.org 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 ------------------------------------------------------------------ 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.org 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