Re: [SI-LIST] : Design Note on Right Angle Bends

HMellberg@aol.com
Fri, 10 Jul 1998 17:26:56 EDT

One of the original reasons for avoiding right angle turns, especially on
small trace widths was the under-etch problem during manufacture. As already
pointed out, the right angle turn is insignificant for logic families with
>300ps rise/fall speeds. The RF and lower frequency microwave folk, do
consider right angles as important because it is a 1/4 turn planar inductor
and at those RF/u-wave frequencies, it must be considered. As far as the
impedance mismatch, yes, it exists for the those concerned with switching
edges in the 300 ps or faster logic.
Hans Mellberg
EMC Consultant.
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