Hi All, I was wondering if anyone has any experience with sharp features in a plane (say power plane) and intensified E-field in the pre-preg as a result? In the case of a uniform power plane on a layer adjacent to a ground layer, we would get a simple v/d relationship for the E-field between the two planes. This is the field intensity that the pre-preg must tolerate without breaking down. If the board carries high voltage say 100VDC and the plane to plane separation is 2 mils, we will have 50v/mil. Howerver, if the power plane has pointed features, we may have a much more intense field. Does anyone have experience with measuring this field or characterizing it? Thanks, Eldho.