Re: [SI-LIST] : hi-speed bd materials

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From: Mitch Morey (cadpro2k@dacafe.com)
Date: Wed Aug 30 2000 - 18:48:48 PDT


Hi Sean,

I've done designs at 2.5Ghz using FR4 material, and the engineer(s)
didn't have a problem with it. The problem might be design inherent
though, in your case. The engineer I worked with did ALOT of greenfield
simulations on hsi signal traces and came up with some very specific
requirements for the layout. BUT! it worked beautifully. The next test
was to do it with Getek material and see if there was a difference, but
since it worked on FR4 material they said "screw that idea.", hence...
no data.

As for a contact for Getek, give Jeannie Newhart a call at GE Plastics:
(800)376-8598. She did wonders for us. Gave us a "unique" Excel
spreadsheet program for the material, talked with the engineers "in
their terms", and did a VERY convincing job. Tell he I said hi. If you
can't do it with FR4 or Getek material, there's more to this arguement
than just the 800Mhz requirement.

Just my $.02 worth.

Mitch Morey
Sr PCB Designer
San Diego, CA

---------Included Message----------
> Date: Wed, 30 Aug 2000 14:11:29 -0700
> From: "Sean Murray" <seandm@mmspec.com>
> Reply-To: "Sean Murray" <seandm@mmspec.com>
> To: <si-list@silab.eng.sun.com>
> Subject: [SI-LIST] : hi-speed bd materials
>
> Looking for info regarding hi-speed materials that would work for
devices
> running at 800 mhz. Currently using getek, but was told to use
CE. Problem
> is that CE is hard to get right now, and customer has belief that
getek has
> problems at 800mhz while CE doesn't. It was my belief that CE was
just getek
> for higher temps. The cost and difficulty in mfg Rogers is out of
the
> question, as rogers is quite expensive and the board in question
is 24
> layers. If anyone can point me in the right direction regarding
literature
> are experiences, it would be greatly appreciated.
>
> Regards,
> Sean Murray
> General Manager
>
> M&M Specialties Inc.
> 1236 W. Southern Ave. #106
> Tempe, AZ. 85282-4518
> Phone: (480) 858-0393 x105
> Cell: (602) 684-7859
> Fax: (480) 858-1882
> Email: seandm@mmspec.com
> WWW.mmspec.com
>
>
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