Kusama, When you use a via to change layers in a signal path, (via drilled diameter 13 mils and height 100 mils) the via looks like a parasitic capacitance of about 0.25 pF added to you signal path. Yes, there is inductance, but that is true of the signal path as well and the effect of the via is a small increase in capacitance. That same via, when used to connect power from a device lead to a plane, will exhibit added inductance. There had been a very large amount of discussion on this site about the extra inductance of such connections. Lee > [Original Message] > From: kusuma palusa <kpalusa@xxxxxxxxx> > To: <si-list@xxxxxxxxxxxxx> > Date: 3/24/2004 8:05:02 AM > Subject: [SI-LIST] Re: Tools to Create IBIS Models > > =3d hi all, > can anyone tell me how to model a via in hspice? > thanks > palusa > =3d > Robert Haller <rhaller@xxxxxxxxxx> wrote: > Steve, > > SiSoft?s SiAuditor product has an add-on SPICE2IBIS option that > provides a robust process for creating single-ended and differential > models with excellent correlation to inputted HSPICE models. > > I have been creating and performing bench correlation of IBIS models for > some time and have created IBIS models that correlate to HSPICE at > frequencies of 1 GHz and above. > > A paper presented at a recent IBIS summit is available at the > following link. > > http://www.eda.org/pub/ibis/summits/jun03b/haller.pdf > > If you would like more information please respond with private email. > > Regards, > Bob > > -- > Robert J. Haller (rhaller@xxxxxxxxxx) > Principal Consultant > Signal Integrity Software Inc. > 6 Clock Tower Place, Suite 250 > Maynard, MA 01754 > Phone: (978) 461-0449, ext 15 > > > > > > So I'll ask the question again. Does anyone have tools they > > can recommend? > > Steve > > swldstn@xxxxxxxxxxxx > > > > > > ------------------------------------------------------------------ > 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 FAQ wiki page is located at: > http://si-list.org/wiki/wiki.pl > > List technical documents are available at: > http://www.si-list.org > > 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 > > > Do you Yahoo!? > Yahoo! Finance Tax Center - File online. File on time. > > ------------------------------------------------------------------ > 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 FAQ wiki page is located at: > http://si-list.org/wiki/wiki.pl > > List technical documents are available at: > http://www.si-list.org > > 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 > ------------------------------------------------------------------ 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 FAQ wiki page is located at: http://si-list.org/wiki/wiki.pl List technical documents are available at: http://www.si-list.org 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