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Vias And Their Effects In Solid Power Planes
Use of vias in solid power planes will decrease the total planar capacitance based on the number of vias and the amount of real estate that has been etched out from the planes. A capacitor works by virtue of energy storage that is contained within a metallic structure. With less metal (copper plane), the current density distribution is decreased. As a result, less area exists to support the number of electrons that create the current density distribution. The figure below illustrates the value of capacitance between parallel power planes in two configurations: solid power planes and power planes with 30% of the area removed by vias and clearance pads.
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