Ray,
You might want to read the following article by Doug Brooks: http://www.ultracad.com/90deg.pdf
Interesting experiment with corners...
Most corners for traces have a radius at the outside corner anyway, equal to half the trace width, due to photoplotting. Aside from that, are you concerned about EMI? Impedance mismatch at any corner is so small compared to anything else that a signal might see on a board (vias, connectors, solder joints between IC leads and board, IC frame). Good return path design and impedance matching will probably yield the best results more so than the type of corner you use. It's good to see that you are covering ALL the bases, leaving no stone unturned, have all your ducks in a row, (insert your own quaint quip here), etc.
Something to ask the forum: Do designers of interposer boards for BGAs use arcs or diagonals for routing? That would be an interesting answer, no?
The IPC offers some courses on high-speed design at various yearly conventions. (If you take a course, the ones given by Rick Hartley are very informative. I am somewhat partial, though; he's in our DC chapter.)
BRgds,
Roger M. Stoops, CID+
Trimble Navigation Ltd., Dayton, OH, USA
Ph: +01 937.245.5288
Fax: +01 937.233.7511
-----Original Message-----
From: DesignerCouncil [mailto:[log in to unmask]]On Behalf Of Ray
Dwyer
Sent: Wednesday, December 17, 2003 8:25 AM
To: [log in to unmask]
Subject: [DC] miter routes
Greetings and Merry Christmas Ya'll,
At what point does an arch miter have better performance than linear miter?
And where can I read up on this subject.
I don't have access to anything like P-Spice.
I generally design to high speed digital signals.
Ray Dwyer
972-371-4046
Maxim
4401 Beltwood Parkway
Dallas, Tx. 75244
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