[SI-LIST] Re: Differential BGA Breakout
- From: <karthikeyavelan.kandasamy@xxxxxxxxx>
- To: <garys@xxxxxxxxxxx>, <si-list@xxxxxxxxxxxxx>
- Date: Fri, 13 Apr 2012 03:50:42 +0000
Hi,
Both are OK. There will not be any difference in SI analysis.
Option one is easy for layout engineer to Fan-out the BGA which is frequently
used.
Regards
Karthik
-----Original Message-----
From: si-list-bounce@xxxxxxxxxxxxx [mailto:si-list-bounce@xxxxxxxxxxxxx] On
Behalf Of Gary Stein
Sent: Thursday, April 12, 2012 11:11 PM
To: si-list@xxxxxxxxxxxxx
Subject: [SI-LIST] Differential BGA Breakout
With a uniform breakout of a 1mm BGA, one often sees a pattern such as:
O O balls
\ \
x x vias
---/ /
--------/ diff pair
(forgive the crude ascii drawings!)
Is there any significant issue to using a pattern like this at 10 Gbps?
x
/|
____/_|
O O
~~~~~ | /
| /
x
Excuse the lack of scale in these drawings, but in both cases the vias are the
same distance apart.
Assume proper return vias and other factors are the same. If any asymmetry is
introduced, it would seem to be no worse than meanders for length matching and
other short length discontinuities.
Thanks,
Gary Stein
Network Instruments
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