Hi Nitin, AC coupling capacitors are useful not only when the bias voltage of driver and receiver are different, but also when their reference are not exacctly the same. If you connect two different systems with a cable the refernce ground could be a different level. Due to this difference the receiver of one side can see a signal with a not correct bias level, putting the AC coupling capacitors the bias level is generated near the receiver and the receivers see tthe signal with a correct bias level. regards Carlo --- In si-list@xxxxxxxxxxxxxxx, <jain.nitin@...> wrote: > > > Hello, > > For a gigabit differential pair AC coupling capacitor is used. But what > exactly is the use of AC coupling capacitors? I believe that they are > used when the bias voltage of driver & receiver are different.=3D0D > > Also where exactly AC coupling capacitors should be placed when the > differential trace is running on a backplane from one daughter card to > other (at driver end or at receiver end). > > What will happen if two AC coupling caps are used. One at driver side > and other at receiver side. > > With regards, > Nitin > > > The information contained in this electronic message and any attachments to=3D > this message are intended for the exclusive use of the addressee (s) and=3D > may contain proprietary, confidential or privileged information. If you=3D > are not the intended recipient, you should not disseminate, distribute or=3D > copy this e-mail. Please notify the sender immediately and destroy all=3D > copies of this message and any attachments.=3D0D > > WARNING: Computer viruses can be transmitted via email. The recipient=3D > should check this email and any attachments for the presence of viruses.=3D > The company accepts no liability for any damage caused by any virus=3D > transmitted by this email. > =3D0D > www.wipro.com > ------------------------------------------------------------------ > To unsubscribe from si-list: > si-list-request@... 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@... 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