RE: [SI-LIST] : skin effect

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From: Beal, Weston (weston_beal@mentorg.com)
Date: Thu Aug 31 2000 - 12:06:33 PDT


Craig brings up a good point that is confusing the matter. There is skin
effect, skin depth, and there is skin (effect) resistance. The skin effect
is just the concept that higher frequency current tends to concentrate
towards the edge of a conductor. The skin depth is a measure of the skin
effect and has been described already by Ray Anderson (using the book that I
introduced to him :) ). Skin depth is dependent on frequency and material.
The skin resistance is the actual distributed resistance of a particular
trace dependent on the skin depth and cross sectional geometry. With this
in mind, most of the previous auguments make more sense.

Regards,
Weston

+ -----Original Message-----
+ From: Clewell, Craig W [mailto:ClewelCW@bergelect.com]
+ Sent: Thursday, August 31, 2000 11:24 AM
+ To: 'Muhammad S. Sagarwala'; si-list@silab.eng.sun.com
+ Subject: RE: [SI-LIST] : skin effect
+
+
+ Muhammad,
+
+ Funny thing....I was under the impression that the skin depth was
+ "frequency" and "material" dependant not geometry dependant.
+ I would be
+ curious to know what data your boss has that says different.
+
+ Craig
+
+ -----Original Message-----
+ From: Muhammad S. Sagarwala [mailto:msagarwa@san-jose.tt.slb.com]
+ Sent: Thursday, August 31, 2000 12:45 PM
+ To: si-list@silab.eng.sun.com
+ Subject: [SI-LIST] : skin effect
+
+
+ Hello Si Gurus,
+
+ I just had an interesting discussion with my boss on "skin
+ effect on pcb
+ traces".
+ I was of the opinion that increasing the trace thickness from
+ 1/2 oz. to
+ 1oz. would help reduce the
+ skin effect but according to him skin effect does not reduce
+ significantly
+ with the increase in trace thickness.
+ He was of the opinion ( and also had some data to back him
+ up) that skin
+ effect is more dependent on the
+ width of the trace.
+
+ I always thought that if one increases the overall perimeter
+ of the pcb
+ trace - regardless of whether it is done by
+ increasing the width or increasing the thickness - the skin
+ effect would
+ reduce. I would appreciate if somebody
+ could come up with a better explanation...
+
+ Muhammad
+
+ p.s.: when we talked about pcb traces we were talking about
+ striplines in
+ particular...
+
+
+
+
+
+ Muhammad S. Sagarwala
+ Design Engineer
+ Schlumberger SABER
+ Ph. (408) 586 7065
+ Fax (408) 586 4668
+
+
+
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