[SI-LIST] Re: skin effect

Good recommendations and summary Tony.

I heard a rumor that certain processes have greatly reduced surface =
roughness tooth dimensions.  Can anyone substantiate?

Rgds,

Dan

-----Original Message-----
From: si-list-bounce@xxxxxxxxxxxxx
[mailto:si-list-bounce@xxxxxxxxxxxxx]On Behalf Of Dunbar, Tony
Sent: Monday, July 26, 2004 6:31 AM
To: si-list@xxxxxxxxxxxxx
Subject: [SI-LIST] Re: skin effect


Santhosh,

Any high-speed digital design and signal integrity text book worth its =
salt
covers skin effect to some degree. I would point you at two references =
for
both a fundamental, yet still quite thorough coverage, and also a more
analytical coverage:

1) High-Speed Digital System Design; Hall, Hall, McCall; John Wiley & =
Sons,
2000.

2) High-Speed Signal Propagation; Johnson & Graham; Prentice Hall, 2003.

Skin effect is the frequency-related effect whereby current density =
tends to
migrate to the surface (or "skin") of a conductor. The depth of the =
majority
of the concentration is called the "skin depth." The skin depth is =
related
to the inverse square-root of the frequency and the square-root of the
conductor's resistivity. Skin effect is both a microstrip and stripline
phenomenon. You may wish to look at surface roughness and how that =
factors
into the overall situation with skin effect.

Regards,
Tony

-----Original Message-----
From: si-list-bounce@xxxxxxxxxxxxx [mailto:si-list-bounce@xxxxxxxxxxxxx] =
On
Behalf Of Santhosh E P (setavala)
Sent: Monday, July 26, 2004 7:31 AM
To: si-list@xxxxxxxxxxxxx
Subject: [SI-LIST] skin effect

hi all,
can anyone give a definition for skin effect in pcb... how does this =
change
according to the frequency of the signals?
is skin effect comes into picture on for the micreostrip not for =
stripline,
if then why?
regards
santhosh

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