Steve, in my haste I was thinking double termination ah la video. You are right. Nothing needs to be done at the driver. Dave On 12/4/08, steve weir <weirsi@xxxxxxxxxx> wrote: > > Parallel terminations absorb energy at the far end and is related only > to the channel, not the driver Z. Also, you've got your impedances > backward. > > Steve. > King Da wrote: > > 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 > > > > > > > > > > > -- > Steve Weir > Teraspeed Consulting Group LLC > 121 North River Drive > Narragansett, RI 02882 > > California office > (866) 675-4630 Business > (707) 780-1951 Fax > > Main office > (401) 284-1827 Business > (401) 284-1840 Fax > > Oregon office > (503) 430-1065 Business > (503) 430-1285 Fax > > http://www.teraspeed.com > This e-mail contains proprietary and confidential intellectual property of > Teraspeed Consulting Group LLC > > ------------------------------------------------------------------------------------------------------ > Teraspeed(R) 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 > > > ------------------------------------------------------------------ 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