Dave, You fail to mention the dimensions you simulated. What were they? Bill > -----Original Message----- > From: si-list-bounce@xxxxxxxxxxxxx > [mailto:si-list-bounce@xxxxxxxxxxxxx] On Behalf Of DAVID CUTHBERT > Sent: Friday, August 08, 2008 6:59 PM > To: Yuriy Shlepnev > Cc: Chris.McGrath@xxxxxxxx; si-list@xxxxxxxxxxxxx > Subject: [SI-LIST] Re: PCB Corners - Need help finding research paper > > Chris, > > > I wouldn't call it a *myth* but an *exaggeration*. I just ran > a SONNET simulation to confirm this. For the case of the > microstrip I just modeled in > FR-4 the non-chamfered bend shows degraded performance above > 15 GHz. This corresponds to a 25 ps edge. > > > > If one wants to account for every systematic effect in a > system (I consider this good practice) I recommend chamfered bends. > > > > Dave Cuthbert > > > On Fri, Aug 8, 2008 at 3:59 PM, Yuriy Shlepnev > <shlepnev@xxxxxxxxxxxxx>wrote: > > > Chris, > > > > Here is another investigation with comparisons of different > 45-deg and > > 90-deg bends - see App. Note #2007_3 at > > http://www.simberian.com/AppNotes.php > > > > Best regards, > > Yuriy Shlepnev > > www.simberian.com > > > > > > -----Original Message----- > > From: si-list-bounce@xxxxxxxxxxxxx > > [mailto:si-list-bounce@xxxxxxxxxxxxx] > > On > > Behalf Of Chris.McGrath@xxxxxxxx > > Sent: Friday, August 08, 2008 11:11 AM > > To: si-list@xxxxxxxxxxxxx > > Subject: [SI-LIST] PCB Corners - Need help finding research paper > > > > I used to have a copy of a public paper that debunked the myth that > > stated the evils of using 90 degree corners when routing > PCB traces. > > I can't seem to find it on the web, so I'm hoping that one > of you may > > either have a copy of it or can point me to the link. Feel free to > > email me directly with the attachment since the SI List > server will block it. > > Thanks! > > Chris > > > > > > ------------------------------------------------------- > > Chris McGrath > > Applications Engineer > > chris.mcgrath@xxxxxxxx > > Office: 480.704.7061 > > Blackberry: 480.747.3848 > > www.smsc.com > > ------------------------------------------------------- > > > > > > > > ------------------------------------------------------------------ > > 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 > > 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 technical documents are available at: > > http://www.si-list.net > > > > 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 technical documents are available at: > http://www.si-list.net > > 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 technical documents are available at: http://www.si-list.net 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