[SI-LIST] Re: Skin depth,copper,gold

  • From: "Yuriy Shlepnev" <shlepnev@xxxxxxxxxxxxx>
  • To: <balaseven@xxxxxxxxx>, <si-list@xxxxxxxxxxxxx>
  • Date: Mon, 7 Oct 2013 18:53:18 -0700

Bala,

Yes, you definitely have to consider the properties of the plating materials
too, especially in the case of ENIG plated traces. A broadband model of ENIG
plated traces must include properties of all 3 materials - copper, nickel
and gold. Otherwise the model is not accurate enough for the analysis of
multi-gigabit data channels.
See overview, analysis and experimental data for ENIG plated traces at 
Y. Shlepnev, S. McMorrow, Nickel characterization for interconnect analysis.
- Proc. of the 2011 IEEE International Symposium on Electromagnetic
Compatibility, Long Beach, CA, USA, August, 2011, p. 524-529.
The paper is available at IEEE site
http://ieeexplore.ieee.org/xpl/login.jsp?tp=&arnumber=6038368&url=http%3A%2F
%2Fieeexplore.ieee.org%2Fxpls%2Fabs_all.jsp%3Farnumber%3D6038368
You can also find the paper and presentation at www.kb.simberian.com (in
Publications and Presentations sections, require registration).

Best regards,
Yuriy

Yuriy Shlepnev, Ph.D.
President, Simberian Inc.
3030 S Torrey Pines Dr. Las Vegas, NV 89146, USA
Office +1-702-876-2882; Fax +1-702-482-7903
Cell +1-206-409-2368
Skype: Shlepnev

www.simberian.com 
Simbeor - Accurate, Fast, Easy and Affordable Electromagnetic Signal
Integrity Software
2010 and 2011 DesignVision Award Winner


-----Original Message-----
From: si-list-bounce@xxxxxxxxxxxxx [mailto:si-list-bounce@xxxxxxxxxxxxx] On
Behalf Of bala
Sent: Saturday, October 05, 2013 2:47 AM
To: si-list@xxxxxxxxxxxxx
Subject: [SI-LIST] Skin depth,copper,gold

Hi all,
When I model my surface microstrip trace,generally,I am taking properties of
copper into consideration.and if my copper plated with gold or nickel,I am
suspecting if we really need to consider the properties of plating material
as well.One of the document says ,based on your skin depth choose your
material property.My question is at low freq my signal uses my entire cross
section(copper+gold) and at high frequency my skin depth shrinks and my
signal uses outer surface of my conductor(gold on top side ,copper on bottom
side).In both cases I should take both properties.How skin depth plays a
role in choosing the material property (copper or both)while modeling
microstrip?
Regards
bala

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