[SI-LIST] Re: CHGND connection in DVI connector
- From: "Kenneth W. Egan" <kegan@xxxxxxxxxxxxx>
- To: "'qantrix'" <qantrix@xxxxxxxxx>, <si-list@xxxxxxxxxxxxx>
- Date: Tue, 4 May 2010 10:53:23 -0500
DVI has inherent common mode problems due to the nature of the connector
design, i.e. there is mismatched cap to ground across the differential pair.
As a result, the cable typically will radiate, due to common mode conversion
at the connector itself.
KWE
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-----Original Message-----
From: si-list-bounce@xxxxxxxxxxxxx [mailto:si-list-bounce@xxxxxxxxxxxxx] On
Behalf Of qantrix
Sent: Tuesday, May 04, 2010 7:08 AM
To: si-list@xxxxxxxxxxxxx
Subject: [SI-LIST] CHGND connection in DVI connector
I have question about CHGND connection in DVI connector/cable.
There is two kind of shields - one - is shield for data/clock pair;
second - whole cable shield.
http://en.wikipedia.org/wiki/Digital_Visual_Interface
We had some EMC consultation - was suggested to connect internal pairs
shield to chgnd.
on pcb make polygone chgnd that cover area up to end of dvi connector.
So diff.pairs will run under slot of gnd.separation.
Question is - how should be connected internal shields in DVI
conenctor - to sgnd or to chgnd?
diff. pairs running on the slot - seems like bad idea?
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