sorry for the typo!! The command lines should be: 1. W1 in1 0 out1 0 N=1 L=length RLGCMODEL=cps_102030 W2 in2 0 out2 0 N=1 L=length RLGCMODEL=cps_102030 .model cps_102030 W MODELTYPE=RLGC + N=1 + Lo =7.955539012541763e-007 + Co = 5.977204400100264e-011 + Ro = 3362.163358282071 + Go = 0 + Rs =0.01781587892113573 + Gd =1.151478112888962e-010 2. W1 in1 in2 gnd1 out1 out2 gnd2 N=2 L=length RLGCMODEL=cps_102030X2_30 .model cps_102030X2_30 W MODELTYPE=RLGC + N= 2 + Lo =7.955539012541763e-007 0 7.955539012541763e-007 + Co = 5.977204400100264e-011 0 5.977204400100264e-011 + Ro = 3362.163358282071 0 3362.163358282071 + Go = 0 0 0 + Rs =0.01781587892113573 0 0.01781587892113573 + Gd =1.151478112888962e-010 0 1.151478112888962e-010 There simulation results should be same but the results are weird. They are different? Any people share this kind of experience with me? Or know the root cause? Rick Brooks <ricbrook@xxxxxxxxxxx> wrote: I'm not sure I understand your question.. One of these models is for a single ended transmission line, the other is for a coupled line or differential pair although there seems to be no coupling between the two lines. I think that you may need to have a Go line in the first model located after the Ro line. I hope it helps, - Rick At 10:11 PM 8/23/2003 +0800, you wrote: >Hi, experts: > >I had a problem on W-element in hspice. > >I am using two kinds of ways to simulate two transmission lines: > >1. Use > >W1 in1 0 out1 0 N=1 L=length RLGCMODEL=cps_102030 >W2 in2 0 out2 0 N=1 L=length RLGCMODEL=cps_102030 >..model cps_102030 W MODELTYPE=RLGC >+ N=1 >+ Lo= 7.955539012541763e-007 >+ Co= 5.977204400100264e-011 >+ Ro= 3362.163358282071 >+ Rs= 0.01781587892113573 >* Gd= 1.151478112888962e-010 > >2. Use > >W1 in1 in2 gnd1 out1 out2 gnd2 N=2 L=length RLGCMODEL=cps_102030X2_30 >..model cps_102030X2_30 W MODELTYPE=RLGC >+ N= 2 >+ Lo =7.955539012541763e-007 0 7.955539012541763e-007 >+ Co = 5.977204400100264e-011 0 5.977204400100264e-011 >+ Ro = 3362.163358282071 0 3362.163358282071 >+ Go = 0 0 0 >+ Rs =0.01781587892113573 0 0.01781587892113573 >+ Gd =1.151478112888962e-010 0 1.151478112888962e-010 > > >Simulation with these two kins of configurations are different. Can any >one help me find the reason? >Any thing special in Hspice worth attention? > >Thanks! >BH @emlab > > > >--------------------------------- >Do You Yahoo!? >ÑÅ»¢µçÓÊ£º¡°ÎÒÃÇÇãÌýÄúµÄÉùÒô¡¡¡± > >------------------------------------------------------------------ >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 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 > --------------------------------- Do You Yahoo!? ÑÅ»¢µçÓÊ£º¡°ÎÒÃÇÇãÌýÄúµÄÉùÒô¡¡¡± ------------------------------------------------------------------ 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 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