Steve, Thanks for your reply. I should clarify my question with Hspice W model as follows: in1 --------------------- out1 in2 --------------------- out2 in3 --------------------- out3 |<---length=3D10cm---->| W1 N=3D3 in1 in2 in3 gnd out1 out2 out3 gnd RLGCMODEL=3Dex_rlgc l=3D10cm Here I want to change the length of (in1,out1) to 10.1cm and the others are the same length (10cm). If then, I think it is hard to specify the different lengths for each line with W model. Hope this would clarify my question. Yongjin --- In si-list@xxxxxxxxxxxxxxx, steve weir <weirsi@...> wrote: > > YongJin, if I understand you correctly, you would like to see skew > effects from lines with mismatched lengths. Just build a SPICE > simulation with different W elements of like impedance but different > lengths. Alternatively, you can just calculate the timing difference > from the material effective eR and the length offset. > > Steve. > At 12:38 PM 3/29/2006, YongJin CHOI wrote: > >Dear SI members, > >I am looking for a simple simulation method to get a > >rough idea if one or two of the four traces is a > >little bit longer like 1~2mm. The transmission line > >models I am having are W-model from Hspice field > >solver(2-D) and S-parameter model from HFSS. I can use > >Hspice or Spectre depending on the simplicity. > >Any comments would be appreciated. > >Thanks, > > > >Yongjin CHOI > > > >__________________________________________________ > >Do You Yahoo!? > >Tired of spam? Yahoo! Mail has the best spam protection around > >http://mail.yahoo.com > >------------------------------------------------------------------ > >To unsubscribe from si-list: > >si-list-request@... 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@... 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@... 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@... 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