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Sharp features in planes and E-fields

Discussion in 'General Electronics' started by Eldho Kuriakose, Jan 29, 2004.

  1. 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.
     
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