[SI-LIST] Electroless Ni-Au Plating impact on microstrip losses
- From: "Howard Johnson" <howie03@xxxxxxxxxx>
- To: <si-list@xxxxxxxxxxxxx>
- Date: Fri, 27 Aug 2010 10:11:46 -0700
Dear Scott,
Clyde Coombs' "Printed Circuit Handbook", 5th ed., section 32.4 incorporates
a good summary of the "Electroless Nickel / Immersion Gold" (ENIG) process,
plus several other related processes. He quotes the typical layer
thicknesses, but does not mention high-frequency losses. His book,
regarding ordinary pure Nickel plating, was the source of data I used in the
following overview article. The article is not a technical study, but does
describe the nature of the lossy effect:
"Nickel-Plated Traces", (2002) http://www.sigcon.com/Pubs/news/5_6.htm
The immersion Gold platings added on top of Nickel are (according to Clyde)
so thin (much less than a skin depth at multi-gHz) than they have no bearing
on the losses -- it's as if you had an ordinary Nickel-plated trace as in my
2002 article.
Yuri Shlepnev has done a lot of work with boundary-layer field simulations
and may have more information on this topic.
Best regards,
Dr. Howard Johnson, Signal Consulting Inc.,
tel +1 509-997-0505, howie03@xxxxxxxxxx
www.sigcon.com -- High-Speed Digital Design seminars, publications and films
-----Original Message-----
From: si-list-bounce@xxxxxxxxxxxxx [mailto:si-list-bounce@xxxxxxxxxxxxx] On
Behalf Of Scott McMorrow
Sent: Thursday, August 26, 2010 3:40 PM
To: silist
Subject: [SI-LIST] Electroless Ni-Au Plating impact on microstrip losses
Sorry about that. This is the question I sent out.
Is anyone aware of any published research on Ni-Au plating over Microstrip
and the impact on losses other than:
"Ni-Au Surface Finish Effects on RF Performance", D. Staiculescu, J.
Laskar, J. Mendelsohn, E. Sweetman, D. Rudy and I. Artaki , IEEE MTT-S
Digest, 1999, pp 1909-1912.
--
Scott McMorrow
Teraspeed Consulting Group LLC
121 North River Drive
Narragansett, RI 02882
(401) 284-1827 Business
(401) 284-1840 Fax
http://www.teraspeed.com
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Teraspeed Consulting Group LLC
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