[SI-LIST] How to connect Chassis ground to DGND
- From: "Chris Chalmers" <cchalmers@xxxxxxxxxxx>
- To: <si-list@xxxxxxxxxxxxx>
- Date: Fri, 27 Feb 2004 10:30:03 -0000
Folks,
Sorry to bring this old chestnut back to life. I have a question in
relation
to Dr Howard Johnson's note on radiated ground noise (on sigcon website).
I have a board that has a graphics DVI connector on it. I have connected
the grounds on the
connector to DGND on my board. I have also put a chassis ground layer in
my stackup
next to a solid ground layer. From Dr J's note, I have connected DGND on
my board
to the chassis layer at the DVI connector. This is to pin the DGND to the
same potential as the
chassis ground (which should not be bobbing about like the DGND) at this
point so that
noise on my DGND is not radiated on to the graphics cable. Currently I
have made the
connection between CHGND and DGND with an 0603 resistor. Is this OK or
should
I make multiple connections with vias instead of the resistor?
I have a second question as well if I may. I have a connector at the
other end of the
board which I want to implement a similiar strategy. Can I do exactly the
same at this
other connector or will I start to have problems with ground loops between
the two.
Thanks in advance
Chris
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