Jennifer If you tried other passivity/causality enforcement fitters, you might want to try Simbeor from Simberian. The rational macro-models that the software creates are causal. Jennifer Maharani wrote: > Many thanks Gary. I have used the broadband spice generator from > Agilent. It does not fix the causality problem. > > On May 14, 2009, at 10:52 PM, "Gary Otonari" <garyo@xxxxxxxxxxxx> wrote: > > >> Jennifer -- Do you have ADS? It might help you. Here is some >> material on >> recent advances in their transient simulator. The 1st link is for a >> paper >> we (GigaTest) did for the SI Seminar Series last year. The 2nd is a >> webinar >> on the same topic ( I think delivered by Sanjeev Gupta of Agilent). >> Good >> luck. >> >> -- Gary Otonari >> >> http://www.home.agilent.com/upload/cmc_upload/All/Meas_Based_Transient_Simul >> ation_Gigatest.pdf >> >> http://www.home.agilent.com/agilent/editorial.jspx?cc=US&lc=eng&ckey=1454262 >> &nid=-34511.0.00&id=1454262 >> >> >> >> -----Original Message----- >> From: si-list-bounce@xxxxxxxxxxxxx [mailto:si-list-bounce@xxxxxxxxxxxxx >> ] On >> Behalf Of Jennifer Maharani >> Sent: Thursday, May 14, 2009 12:49 PM >> To: si-list@xxxxxxxxxxxxx >> Subject: [SI-LIST] Causality >> >> Dear all, >> >> I have non-passive non-causal S-parameter. I can use some commercial >> tools that can generate broadband spice with passivity enforcement. >> Not with causality enforcement, though. >> >> In transient simulation it clearly shows non-causal response. >> >> Does anybody know how to resolve this issue? Quick and dirty solution >> will also be appreciated. >> >> Many thanks. >> ------------------------------------------------------------------ >> 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 technical documents are available at: >> http://www.si-list.net >> >> 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 technical documents are available at: > http://www.si-list.net > > 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 > > > -- Scott McMorrow Teraspeed Consulting Group LLC 121 North River Drive Narragansett, RI 02882 (401) 284-1827 Business (401) 284-1840 Fax http://www.teraspeed.com Teraspeed® is the registered service mark of Teraspeed Consulting Group LLC ------------------------------------------------------------------ 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 technical documents are available at: http://www.si-list.net 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