[SI-LIST] Differential BGA Breakout
- From: Gary Stein <garys@xxxxxxxxxxx>
- To: <si-list@xxxxxxxxxxxxx>
- Date: Thu, 12 Apr 2012 12:40:40 -0500
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
------------------------------------------------------------------
To unsubscribe from si-list:
si-list-request@xxxxxxxxxxxxx with 'unsubscribe' in the Subject field
or to administer your membership from a web page, go to:
//www.freelists.org/webpage/si-list
For help:
si-list-request@xxxxxxxxxxxxx with 'help' in the Subject field
List forum is accessible at:
http://tech.groups.yahoo.com/group/si-list
List archives are viewable at:
//www.freelists.org/archives/si-list
Old (prior to June 6, 2001) list archives are viewable at:
http://www.qsl.net/wb6tpu
Other related posts:
