[SI-LIST] Re: differential pairs on backplane connectors
- From: <jain.nitin@xxxxxxxxx>
- To: <Stephen.Greenhalgh@xxxxxxxxxxx>, <si-list@xxxxxxxxxxxxx>
- Date: Fri, 13 Jan 2006 09:51:55 +0530
Hello,
Recently we have used 2mm Hard metric connectors in our Backplane Board.
There we have assigned a diff pair in same column. The reason for this
was that the the pins in a column are made of same wafer and hence the
pins of each column are expected to behave in same manner. Althouh this
introduced pin mismatch as we were using a right angle connector. On our
Backplane each diff pair was passing through two connectors. Hence to
compensate for the length mismatch we connected the shorter pin of one
connector to longer pin of other connector. In other words, if the diff
pair is assigned in 'a' & 'b' row, the signal connected on pin of row
'a' of one connector will go to pin of row 'b' of other connector.=0D
I hope my explanation makes sense to you.
Regards,
Nitin=0D
-----Original Message-----
From: si-list-bounce@xxxxxxxxxxxxx [mailto:si-list-bounce@xxxxxxxxxxxxx]
On Behalf Of Stephen Greenhalgh
Sent: Thursday, January 05, 2006 4:43 PM
To: Si-List (E-mail)
Subject: [SI-LIST] differential pairs on backplane connectors
When using standard pin matrix backplane connectors (for example, 2mm
hard metric), the conventional wisdom was to assign two adjacent pins in
the same row for a differential pair. This meant that the right angle
(daughter board) connections were of equal length and geometry.
However, the newer connectors, designed specifically for differential
pairs (for example, FCI Airmax VS, Amphenol GcX or ERNI ERmet ZD) use
pairs of pins in the same column. This seems surprising, since it
appears to mean that there is an inherent imbalance between the two
connections. Perhaps this is taken into account in the connector design?
Can anyone provide an explanation or clarification, please?
Stephen Greenhalgh
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