Hello Yardala, Take a look at any school book on SI. A hint, you need to be concerned with harmonics up to 5th in most applications. Regards, -Jory ________________________________ From: yardala <yardala@xxxxxxxxx> To: si-list@xxxxxxxxxxxxx Sent: Sat, December 18, 2010 9:07:04 AM Subject: [SI-LIST] How much stop frequency is enough for PCB model extraction in HDMI and USB interface ? Hi, When we use EM solver to extract PCB model, the stop frequency is usually set as knee frequency ( 0.5 /Tr). for example, Let Tr =200ps of single end signal , then we set sweep stop frequency at 2.5GHz. but in differential HDMI or USB interfact, how to set this stop frequency efficiently? For example, we target at HDMI 1080P / deep color, the data rate around 2.225 Gbps, I don't know the signal rise time, when we want to extract a PCB S-model of HDMI channel. How to decide the stop frequency is good enough ? Which is the major consideration, signal rise time or data rate ? Thanks for any advices. Yardala ------------------------------------------------------------------ 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 ------------------------------------------------------------------ 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