Hi Scott, Thanks for your info. Let me go through. Regards, Arun Kumar From: Scott McMorrow [mailto:scott@xxxxxxxxxxxxx] Sent: Monday, April 13, 2009 7:50 PM To: Arun kumar P N Cc: 'steve weir'; si-list@xxxxxxxxxxxxx; anuj.singh@xxxxxxxxxxxx Subject: Re: [SI-LIST] Re: Return loss measurement on differential signals Arun I suggest that you use the Agilent website as a resource. There are many papers on these subjects there. regards, Scott Arun kumar P N wrote: Hi Steve, Thanks for your reply. Can you reply in details? and if you have docs please forward to me. I will go through it. Arun Kumar -----Original Message----- From: steve weir [mailto:weirsi@xxxxxxxxxx] Sent: Monday, April 13, 2009 7:36 PM To: Arun kumar P N Cc: si-list@xxxxxxxxxxxxx; anuj.singh@xxxxxxxxxxxx Subject: Re: [SI-LIST] Return loss measurement on differential signals For differential signals you need to do four port measurements. The poor man's solution is to use baluns. This adds error sources that need to be corrected and is limited to the linear range of the baluns. Steve. Arun kumar P N wrote: Hi all, I had gone through the details about return loss measurement and relation between VSWR(Voltage standing wave ratio) & reflection coefficient in Google. Return loss = -20log (Vr/Vt) Where, Vr- Amplitude of reflected wave Vt- Amplitude of Transmitted wave ñ magnitude of à ñ = | à | . Relation between VSWR(Voltage standing wave ratio) and reflection coefficient. VSWR = (1 + ñ)/(1 - ñ) Will this equations applicable for differential signals?, if I am going to measure Signal P with respect to Signal N in the differential pair. If you would have any alternate solution to measure return loss of differential signal, please suggest me. Thanks & Regards, Arun Kumar P N ------------------------------------------------------------------ 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