Sir, Excuse me and Correct me if I am wrong I feel that the inductance of the differential line measured by applying a differential signal on a pair of differential traces, will be less than the twice the inductance measured by applying a single ended signal on a trace , as the magnetic field formed due to current in one traces aiding the current flow other. i.e differential inductance will be, equlaent to 2 single ended inductances in series and their mutual inductance between them in parallel. I don't know about the accuracy the tool Iused , but Inductance calculated shows that the mutual inductance are not that small to be ignored. (as per Inductance calculator at http://emcsun.ece.umr.edu/new-induct/ ) My assumptions are * Single ended inductance measured with no other lines in its vicinity. * Differential inductance measured with no other lines other than them. Joe Ordyn,India. > Mark, > > Welome to the si-list forum. > > In a very simplistic way we can say that the differential impedance > is twice the single-ended impedance because we connect two > transmission lines in series. Series impedances add, similarly > series-connected inductances add. You can use the same > formula of Zo*delay, just have to substitute the correct terms: > differential impedance and differential (odd-mode) delay. > You can find very good tutorials on the subject on the TDA > Systems website. http://www.tdasystems.com/ > > Regards, > > Istvan Novak > SUN Microsystems > > Mark Burford wrote: > > >Hi guys, just subscribed. > >I understand the inductance of stripline to be Z0*delay_of_line > >Could anyone tell me what the inductance is for differential odd mode > >stripline please? Does it change? I know Z0 for differential stripline > >is near double that of single stripline, but does this affect > >inductance? > > > >Many thanks > > > >Mark Burford > >Mburford AT xyratex DOT com > > > > > > > > > > ------------------------------------------------------------------ > 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 FAQ wiki page is located at: > http://si-list.org/wiki/wiki.pl?Si-List_FAQ > > 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 FAQ wiki page is located at: http://si-list.org/wiki/wiki.pl?Si-List_FAQ 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