Thanks everyone for clearing my doubt !! I have one more question, I know it may look silly and is very basic but I am sure experts here can enlighten me. Can anyone explain that why it?s said that transmission line can be modeled as distributed RLGC model ? Ok I know distributed model has high bandwidth but why distributed ckt has more bandwidth than lumped ckt ? Why minimum 10 LC sections are needed for transmission line ? Rajan On Tue, Aug 9, 2011 at 3:55 PM, Rohit MISHRA <rohit.mishra@xxxxxx> wrote: > Rajan, > > Here's my 2 cents : > > I believe you can use a receiver without matching it's input impedance with > transmission line impedance But Only If the system satisfies these > conditions : > > 1) Transmitter is connected to single receiver. > 2) Transmission line is a controlled impedance line and has no > unintentional impedance discontinuities(like via, stub, package lead, etc) > > In real system even though board is designed with controlled-impedance > traces, there is still the opportunity for a signal to see an unintentional > impedance discontinuity and in this case just source termination won't stop > the ringing that's why termination at both end. > > Rohit > > > > -----Original Message----- > From: si-list-bounce@xxxxxxxxxxxxx [mailto:si-list-bounce@xxxxxxxxxxxxx] > On Behalf Of Rajan Hansa > Sent: Tuesday, August 09, 2011 1:57 PM > To: si-list@xxxxxxxxxxxxx > Subject: [SI-LIST] Why Termination at Both End ? > > Experts, > > Can anyone explain that why in some designs we see source as well as load > terminations, I mean termination at both side of traces ? If ringing is a > issue then only source termination should be sufficient to control it and > we > can use a receiver with very high input impedance i.e. no need to match > input impedance of receiver with transmission line characteristics > impedance. > > Rajan > > > ------------------------------------------------------------------ > 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 > > 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 > > 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 Old (prior to June 6, 2001) list archives are viewable at: http://www.qsl.net/wb6tpu