[SI-LIST] Shield ground isolation


Hi All,

On high speed boards with I/O connections running to outside world, the
shield ground of the connectors should be isolated from the digital ground
if the board has to meet the requirements of EMI/EMC compliance standards.

Are there any side-effects of isolating the shield ground from the digital
ground?


I have seen on some boards, that the isolation is achieved by using ferrite
beads. On few others i have seen capacitors being used b/n shield and
digital ground.

How are capacitors useful in acheiving isolation? Or are these caps used for
some other purpose, which i am not able to understand? 

What is the best method to achieve this isolation?

Thanks in advance.

Regards,
Anand.
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