Interesting thread so far. There are tools that can convert the S-params to an equivalent passive circuit, which automatically insures passive/causal. Other tools can "adjust" the S-params to guarantee passivity and causality (such as a pole/zero format), to account for noise in the data. The usual caveat applies: the modified model could result in slower simulation. For example, slower simulation with added "nodes" is a known issue in SPICE. Some tools let you select the number of RLC stages to use, so you can trade off accuracy against SPICE simulation time. - Lynne "IBIS training when you need it, where you need it." Dr. Lynne Green Green Streak Programs http://www.greenstreakprograms.com 425-788-0412 lgreen22@xxxxxxxxxxxxxx -----Original Message----- From: si-list-bounce@xxxxxxxxxxxxx [mailto:si-list-bounce@xxxxxxxxxxxxx] On Behalf Of Saoer Sinaga Sent: Thursday, November 29, 2007 11:02 AM To: si-list@xxxxxxxxxxxxx Subject: [SI-LIST] Re: time domain simulation of s-parameter That's not always the case. When you don't have DC data in your S-par, not to mention the S-par is not passive guaranteed, your transient simulation will not converge. saoer On 11/29/07, sanjeev_gupta@xxxxxxxxxxx <sanjeev_gupta@xxxxxxxxxxx> wrote: > > Hi SKGUPTA, > > Kindly contact ADS online Tech support! ADS provide the most robust = > convergence on S-parameters. > > Sanjeev > Agilent EEsof > > -----Original Message----- > From: si-list-bounce@xxxxxxxxxxxxx > [mailto:si-list-bounce@xxxxxxxxxxxxx] = On Behalf Of Sanjeev Gupta > Sent: Tuesday, November 27, 2007 6:49 AM > To: si-list@xxxxxxxxxxxxx > Subject: [SI-LIST] time domain simulation of s-parameter > > Hello All > I am trying to do time domain simulation using Agilent ADS after = > extracting s-parameter model from Power SI. > But, i am getting lot of convergence issue. Simulation gets terminated > immediately. I do not get any time domain waveform. > kindly suggest a solution.. which tool can solve such problem very > efficiently? > Thanks in advanve > Sanjeev > > > ------------------------------------------------------------------ > 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: =20 > //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 =20 > > > ------------------------------------------------------------------ > 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 ------------------------------------------------------------------ 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