[SI-LIST] Re: PCB Corners - Need help finding research paper
- From: "Jack Olson" <pcbjack@xxxxxxxxx>
- To: "DAVID CUTHBERT" <telegrapher9@xxxxxxxxx>
- Date: Fri, 8 Aug 2008 14:02:22 -0500
I don't think I've ever seen sharp corners on a trace (20 years?)
Since every CAD program I know assigns round apertures for
routes, corners look rounded.
So where are all these sharp corners coming from? tape?
Jack (an old guy)
On 8/8/08, DAVID CUTHBERT <telegrapher9@xxxxxxxxx> wrote:
>
> Chris,
> I can run a quick SONNET sim for you to show what happens with sharp 90
> degree corners and with chamfered corners. The sharp corners add some
> capacitance and lower the Z0. For anything that I have done this effect was
> almost negligible.
>
> Howard Johnson's book has a section on this, I think.
>
>
> Dave Cuthbert
>
> On Fri, Aug 8, 2008 at 12:11 PM, <Chris.McGrath@xxxxxxxx> wrote:
>
> > 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
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