Fig. 1 shows a schematic of an EAC inside a microprocessor package. The EAC is placed inside a cut-out within the HDI substrate core and the surrounding space is filled with a pluggingmaterialwhichiscuredbeforethesubstratebuild-up(BU). AlternateEACelectrodesareconnectedtopowerandgroundso that the capacitance is in parallel to the power supply. Typical EAC length and width is of the order of several mm, while the thickness is of the order of substrate core, i.e., in the range of a mm for ultrahigh performance packages.