The "20H Rule" specifies that the amount of cutback
of the power plane from the edge of it's associated
ground is twenty times the height between the power
plane and ground plane. Did that sound ok?
If not, here's an ASCII graphical for you ...
Ground Plane
------------------------------------------
Distance between Power Plane and
Ground Plane = H
-------------------- <------------------>
Power Plane Cutback of Power
Plane = 20*H
Regards, Doug McKean
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