[SI-LIST] Re: Backdrill under BGA
- From: "qazi" <qazi@xxxxxxxxxx>
- To: <cygnul@xxxxxxxxx>, <si-list@xxxxxxxxxxxxx>
- Date: Wed, 22 Jul 2009 09:15:22 -0700
Sam,
Yes we have back drilled in GHz boards. It works pretty well.
Cadence has a built in feature to define back drills and their depths. If
you are using Mentors (PADs) you might have to manually locate the vias (or
use a separate drill size than the others).
The antipad and layer stackup plays the main role. I can send you an example
setup if you are interested to take a look.
-Qazi
-----Original Message-----
From: si-list-bounce@xxxxxxxxxxxxx [mailto:si-list-bounce@xxxxxxxxxxxxx] On
Behalf Of cygnul@xxxxxxxxx
Sent: Tuesday, July 21, 2009 5:46 PM
To: si-list@xxxxxxxxxxxxx
Subject: [SI-LIST] Backdrill under BGA
SI Gurus,
Has anybody done back drilling on BGA vias for multi gig traces?
is that achievable? If so, what was the via structure?
-Sam
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