[SI-LIST] Copper Grounding

Hi experts ::
 
While designing a multilayer PCB  if all the left over area (after the 
routing and etc is done) is grounded by filling  copper, what kind of 
impact is it going to have on a) purely
digital boards b)Mixed signal boards with separate analog and digital power 
planes,c)RF boards.
 
Pls explain in detail if there is any bench mark to decide whether or not 
go for copper filling in the unused areas.Or  is there any tool which could 
help us decide this.
 
Best Regards

-- 
suresh

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