Greetings all.
I have a general question about the use of isolated ground rings at
the periphery of rack type optical interface cards (so maybe it's
specific). My understanding is that isolated (fully moated) ground
rings are often placed around the edges of high speed interface cards in
an attempt to keep ESD out of critical areas on the board (or to hold in
edge radiation is another more suspect reason I have heard). This just
seems like a bad idea to me, but I must admit that I am not on the
design end of things. I ran this by a microwave specialist I know and
he shared my opinion. There just seem to be too many opportunities for
arc-over or induced voltages that could cause the same or more damage to
the board.
My question is this: does anyone have a concrete reason why such a
ground ring would be a good idea? I would like to keep this discussion
in the 1+GHz range, but anyone with experience please feel free to chip
in.
Thanks in advance
David Heald
Senior EMC Engineer/
Product Safety Engineer
Curtis-Straus LLC NRTL
Laboratory for NEBS, EMC, Safety, and Telecom
Voice:978.486.8880x254 Fax:978.486.8828
www.curtis-straus.com
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