Tim, This is what I got in SpecctraQuest, assuming you are using Er of 4.5: 566.5 nH/M 57.46 pF/M Could you check your units again. > Delivered-To: si-list@xxxxxxxxxxxxxx > Date: Wed, 31 Oct 2001 12:11:16 -0500 > From: tcoyle <TCoyle@xxxxxxxxxxxxxxxxxxxxxxx> > X-Accept-Language: en > MIME-Version: 1.0 > To: si list <si-list@xxxxxxxxxxxxx> > Subject: [SI-LIST] Differences between HSPICE Field Solver and XTK Field Solver > Content-Transfer-Encoding: 8bit > X-archive-position: 1211 > X-listar-version: Listar v1.0.0 > X-original-sender: TCoyle@xxxxxxxxxxxxxxxxxxxxxxx > X-list: si-list > > > Dear Si List, > I am using the microstrip equation in Howard Johnson's book to calculate > the impedance. So given a w=8mil, t=1.37mil, and h=21mil, I get an > impedance > of about 100 ohms. When I use the XTK field solver, I get an L=14.5nH > and a C=1.4pF. When I use the HSPICE field solver, I get an L=65nh and a > C=6.5pF. They both give me an impedance of 100 Ohms but are quite > different values. I think the XTK values are correct, so I'm wondering > about the HSPICE field solver. Has anyone compared results between these > two tools? > > Thanks > > Tim > > > ------------------------------------------------------------------ > 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 > > -Kevin ------------------------------------------------------------------ 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