---- Original message ---- >Date: Tue, 5 Jul 2005 15:22:49 -0700 >From: "Robert Sefton" <rsefton@xxxxxxxxxxxxx> >Subject: [SI-LIST] Re: Q on Trace Width and Jitter for Diff Pairs >To: <Charles.Grasso@xxxxxxxxxxxx>, <si-list@xxxxxxxxxxxxx> > >Hi Charles - > >Nobody has really addressed the jitter question. It doesn't seem to me that >jitter is directly related to signal loss, regardless of whether the loss >comes from skin effect or the dielectric. But DJ is directly affected by >reflections caused by impedance variations, correct? Widening traces >decreases the impedance variation caused by imperfect etching, which could >decrease DJ. That's my best guess anyway. > >Regards, >Bob Sefton > >-----Original Message----- >From: si-list-bounce@xxxxxxxxxxxxx [mailto:si-list- bounce@xxxxxxxxxxxxx] On >Behalf Of Grasso, Charles >Sent: Tuesday, July 05, 2005 11:39 AM >To: 'si-list@xxxxxxxxxxxxx' >Subject: [SI-LIST] Q on Trace Width and Jitter for Diff Pairs > >Greetings! > >I am stuck on understanding a contradiction - perhaps someone could >"unstick" me? >It is understood that (at high frequencies) the dielectric losses in a pwb >dominates the losses of a transmission line. However, I have read in various >publications that increasing the trace widths improves the jitter >performance of a high speed serial link. >I would have thought that as a trace width increases the effects of the >dielectrics would be exacerbated. > >How does increasing the width of a trace improve the DJ of the link? > >Best Regards >Charles Grasso >Senior Compliance Engineer >Echostar Communications Corp. >Tel: 303-706-5467 >Fax: 303-799-6222 >Cell: 303-204-2974 >Pager/Short Message: 3032042974@xxxxxxxx <mailto:3032042974@xxxxxxxx> >Email: charles.grasso@xxxxxxxxxxxx; <mailto:charles.grasso@xxxxxxxxxxxx; > >Email Alternate: chasgrasso@xxxxxxxx <mailto:chasgrasso@xxxxxxxx> > > > > >------------------------------------------------------------- ----- >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 > > ------------------------------------------------------------------ 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