[SI-LIST] Re: PCB Corners - Need help finding research paper
- From: "DAVID CUTHBERT" <telegrapher9@xxxxxxxxx>
- To: bdempsey85@xxxxxxxxx
- Date: Fri, 8 Aug 2008 21:12:32 -0600
Oh,
the line width is 10 mils and the distance from the trace to the bottom
reference is 10 mils and 12 mils to the top reference.
Overall it looks pretty minor to me. Now this is just one corner. What if we
have ten?
I think a more important thing to focus on would be vias. This can be more
of a discontinuity than a bend.
Dave Cuthbert
On Fri, Aug 8, 2008 at 6:55 PM, Bill Dempsey <bdempsey85@xxxxxxxxx> wrote:
> 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
> > > -------------------------------------------------------
> > >
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