Re: [SI-LIST] : skin effect

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From: Stefan Ludwig (ludwig@sibyte.com)
Date: Thu Aug 31 2000 - 10:27:03 PDT


Muhammad,

going from 1/2 oz. to 1 oz. increases the thickness of the trace by .7
mil. (thickness (in) = weight (oz) * 1.4). Therefore the perimeter
increases by 1.4 mil. For a 6 mil trace, this is 10%, so it should
have some effect, but not a significant one. Going from a 6 to an 8
mil trace (1/2 oz) increases the perimeter by 30%.

Stefan

"Muhammad S. Sagarwala" wrote:

> 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 theskin
> 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 thewidth of the trace. I always thought that if
> one increases the overall perimeter of the pcb trace - regardless of
> whether it is done byincreasing the width or increasing the
> thickness - the skin effect would reduce. I would appreciate if
> somebodycould come up with a better explanation... Muhammad p.s.:
> when we talked about pcb traces we were talking about striplines in
> particular...

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