Patent ID: 8664768

Claim:
A structure comprising: a substrate having a plurality of balls, the plurality of balls including at least one ball electrically connected to the substrate; a semiconductor chip; and an interposer electrically connecting the substrate and the semiconductor chip, the interposer comprising: a first side; a second side opposite the first side; at least one first exclusion zone, wherein the at least one first exclusion zone extends through the interposer above each ball of the plurality of balls; at least one active through via extending from the first side of the interposer to the second side of the interposer, wherein the at least one active through via is formed outside the at least one first exclusion zone and wherein no active through vias are formed within the at least one first exclusion zone; and at least one dummy through via extending from the first side of the interposer to the second side of the interposer, wherein the at least one dummy through via is formed within the at least one first exclusion zone.