any chance of getting a photo posted?
Sincerely,
-----------------------------------
Cheryl Johnson, C.I.D.+
Manager
ExcelStor US Office, Engineering Services
Email: [log in to unmask]
Tel: (303) 684-7291
Fax: (303) 684-7268
Mobile: (303) 809-5815
-----------------------------------
-----Original Message-----
From: TechNet [mailto:[log in to unmask]]On Behalf Of John Parsons
Sent: Tuesday, August 23, 2005 11:08 AM
To: [log in to unmask]
Subject: Re: [TN] solid gold boards
I usually try to abstain from posting non-technical content but - WOW!
John Parsons
-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of r Tarzwell
Sent: Tuesday, August 23, 2005 10:50 AM
To: [log in to unmask]
Subject: Re: [TN] solid gold boards
The board is microwave, with 10 micron lines which are 20 to 25 micron
thick, the only way i could get it to plate was using gold, copper proved
to be to bumpy way to many noduels and clumps, the surface must be
smooth for the frequency, I also had to use very little oxide foot below
to get the initial thin 2 micron copper to stick to the prepreg, And
Ni was out because of to high a frequency, so the board was not
originaly to be golds just turned out that way, It has bga, smt and
wire bond on it so I needed to be able to advise the assemblers how to try
and solder it, Im not down to the 10 micron yet ( 20 now) but will be
investigating a beter laser. and to boot the micro vias are only 30
microns. a fun but tough board good thing its only 1 inch square.
bob
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