I have used a bigger current by using a faster ramp. The Network analysis now correlates to the transient analysis. I will now use the network analysis for capacitance measurements as this gives a better understanding of the R/C combination for IC decoupling capacitors. Thanks for all your help in understanding this problem. -------------------------------------------------------------- | Bill Cohen | Toshiba America Electronic Components | Mixed Signal Design Group -------------------------------------------------------------- ------------------------------------------------------------------ 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