RE: [SI-LIST] : skin effect

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From: Baikuan Wang (wangbk@sigrity.com)
Date: Thu Aug 31 2000 - 10:19:57 PDT


Hi, Muhammad,

Skin effect means that most of the current flows along the surface of the
conductor.
In this way, the effecient area current goes through is more dependent on
the perimeter rather than the real
area (Height x Width). Therefore, inreasing width is more effecient that
increasing height in view of reducing
the resistance of traces.

Regards.

Brian
  -----Original Message-----
  From: owner-si-list@silab.eng.sun.com
[mailto:owner-si-list@silab.eng.sun.com]On Behalf Of Muhammad S. Sagarwala
  Sent: Thursday, August 31, 2000 9:45 AM
  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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