Venu The center cap is for AC common-match. When the differential line is not of perfect balance, it is very useful. Best Regards Zhangkun 2004.8.30 ----- Original Message ----- From: "Ummalaneni, Venu Babu (Venu)" <venubabu@xxxxxxxxx> To: <si-list@xxxxxxxxxxxxx> Sent: Monday, August 30, 2004 6:04 PM Subject: [SI-LIST] LVDS center tap capacitor termination > Hi=20 > > This query is regarding termination schemes at the LVDS receiver inputs. > > Can some one explain me the difference between a 'single resistor > termination' and 'the two resistors with center tap capacitor' ? > > I read some where that the 'center tap capacitor scheme' filter's the > common mode noise. My doubt is that even in 'single resistor scheme' > also if we run the differential traces verly closely the common mode > noise pick-up by the two traces is equal and the Receiver can reject > this common mode part, right? So why we need to go for center tap > capacitor scheme? It unnecessarily increase the component count on the > board, right? > > Any inputs are appreciated. > > Best regards > Venu Babu. > > ------------------------------------------------------------------ > 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 FAQ wiki page is located at: > http://si-list.org/wiki/wiki.pl?Si-List_FAQ > > List technical documents are available at: > http://www.si-list.org > > 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 FAQ wiki page is located at: http://si-list.org/wiki/wiki.pl?Si-List_FAQ List technical documents are available at: http://www.si-list.org 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