Hi. typically LVPECL to LVPECL interface (or others)using AC coupling as follows : There are pullup/pulldown resistors not illustrated. The first diagram use one capacitor and the second diagram use two capacitors to coupling the interface. I wann'a to know which one is better? What's the priority for each case? ____ ___ |TX |-------||---------|RX | |___|-------||---------|___| ___ ___ |TX |----||---------||---|RX | |___|----||---------||---|___| ----- Original Message ----- From: "hariharan" <hariharan@xxxxxxxxxxx> To: <zanglinyuan@xxxxxxxxxx>; <si-list@xxxxxxxxxxxxx> Sent: Thursday, December 19, 2002 8:24 PM Subject: [SI-LIST] Re: Better choice for AC coupling > > could you please make it clear. I dont understand the question > > do you meant 2 cards are sitting on the backplane with a capacitance for > crosstalk minimization in between? > > kindly ellaborate. > > regards > Hariharan > > -----Original Message----- > From: si-list-bounce@xxxxxxxxxxxxx > [mailto:si-list-bounce@xxxxxxxxxxxxx]On Behalf Of zanglinyuan > Sent: Thursday, December 19, 2002 5:24 PM > To: si-list@xxxxxxxxxxxxx > Subject: [SI-LIST] Better choice for AC coupling > > > Hi.all > we often use AC coupling circuit for differential signal especially > different level type. > > Now I'm designing a system interface as following: > driver card-------backplane---------receiver card > > No doubt ,we need at least one capacitor series in the path to realize > interconnect. > Some vendor also recommend using two capacitors as following: > > driver card----||---backplane-----||----receiver card > > which is better to use one or two capacitors? > What's the priority for each case? > > for above system ,when use one capacitor,where is better to place? > > By the way,The simulation result at receiver card is no difference when we > place one or two capacitor series in the circuit. > > > Thanks. > > > ------------------------------------------------------------------ > 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 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 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 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