[SI-LIST] Re: CHGND connection in DVI connector
- From: steve weir <weirsi@xxxxxxxxxx>
- To: qantrix <qantrix@xxxxxxxxx>
- Date: Tue, 04 May 2010 05:20:53 -0700
Is there a reason you want to isolate signal common from chassis?
Common practice is to join the two near the chassis boundary. If you
attempt to isolate them, you will have lots of capacitive sneak paths.
If they are joined you will not have a CM discontinuity issue.
Steve.
qantrix wrote:
> 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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--
Steve Weir
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