Hi,Folks, I have a differential pair which odd mode impedance is 48 Ohm and even mode impedance is 108 Ohm by TDR measurement. I would like use 100 Ohm for differential termination at far end, but how to choose series termination resistor for each trace at near end? I refered Bogatin's "Signal Integrity:Simplified" book that said parallel termination R2 equal Zeven, So, I should use 108 Ohm subtract 20 Ohm of my driver's Ro is 88 Ohm for my series termination at near end, am I right? The Rseries = 108 (Zeven) - 20 (Driver's Ro) = 88 Ohm, right ? Does the differential termination resistor is 100 Ohm better than 91Ohm ? Thanks, 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 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