A. Introduce a chassis plane to the layer stack, the filter ground is
connected through the via to the this chassis plane. But, where should
the signal return grounds of the cable be connected to? The chassis
plane or the signal ground plane?
B. Moat the signal ground around the connector, leaving a wide piece of
copper to serve as bridge accross the moat. Reserve srew holes on the
ground plane of the connector part to provide a shorted path to the
external chassis plate, when low frequency isolation is not a concern.
However if low frequency isolation do matter, how to capacitively couple
this ground plate to external chassis plate?
C. Moat the signal ground along the board circumference, with the
segmented ground plate along the circumference to serve as chassis
plane. The filter and signal return ground are connected to this plane.
The same question is encounterd as in item B.
Any comments and advices are greatly appreciated?
Synchrotron Radiation Research Center
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