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July 2009

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Subject:
From:
"Upton, Shawn" <[log in to unmask]>
Reply To:
TechNet E-Mail Forum <[log in to unmask]>, Upton, Shawn
Date:
Thu, 30 Jul 2009 10:07:53 -0400
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text/plain (31 lines)
Was it on this list or elsewhere?  I forget now -- but somewhere I read
that they like to do this for cell phones.  By making the external
layers connected to "GND", they can get better capacitive coupling to
the user, which improves RF reception/transmission.

Shawn Upton, KB1CKT
Test Engineer
Allegro MicroSystems, Inc
[log in to unmask]
603.626.2429/fax: 603.641.5336

-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Kenneth Wood
Sent: Thursday, July 30, 2009 10:03 AM
To: [log in to unmask]
Subject: Re: [TN] Hashing-Out Hatching

Actually that is the HDI method that is becoming more and more popular.
Via-in-pad, internal routing and external GND planes.
Ken

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