If you are concerned only with power delivery then simulate to 3X the highest package cut-off frequency of any device you are concerned with that is attached to a given power rail. Steve. On 5/18/2011 3:44 AM, Rajan Hansa wrote: > Hello All, > > > I have got a PCB database of one Ethernet Board and I have to extract > s-parameter for all power plane from voltage regulator to power pin of > chip package. The Board database includes all decap. > > > > As we know extraction time is directly related with maximum frequency So > while setting maximum frequency for s-parameter extraction, I am bit > confused, I would like to know that do I need to set knee frequency ( Fknee > = 0.35/Trise) as maximum frequency OR for board level simulation we > shouldn’t care knee frequency. > > > > As per my understanding, package inductance won’t allow very high frequency > component (switching current component which depends on Trise !!) to travel > to board from chip so voltage regulator in board will never see those high > switching current so I shouldn't simulate/extract s-parameter till knee > frequency. > > > > What’s expert view on this ? > > > > Rgds, > > Rajan > > ------------------------------------------------------------------ > 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 > > Old (prior to June 6, 2001) list archives are viewable at: > http://www.qsl.net/wb6tpu > > > -- Steve Weir IPBLOX, LLC 150 N. Center St. #211 Reno, NV 89501 www.ipblox.com (775) 299-4236 Business (866) 675-4630 Toll-free (707) 780-1951 Fax ------------------------------------------------------------------ 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 Old (prior to June 6, 2001) list archives are viewable at: http://www.qsl.net/wb6tpu