Patent ID: 6489682
Filing Date: 2002-12-03
Classification: G01B,H01L

Abstract:
A BGA semiconductor package comprising:a substrate having an upper surface, a lower surface, a ground plate disposed under the upper surface and at least one power plate disposed between the ground plate and the lower surface; a chip mounted in the central region of the upper surface of the substrate, the chip having a plurality bonding pads thereon, a ground ring disposed on the upper surface of the substrate surrounding the chip and having a first set of serrated portions extending toward the outer edge of the substrate; a first power ring surrounding the ground ring and having a second set of serrated extending portions interlacing coincidentally with the extending portions of the first serrated ground ring in a manner that the distances from the bonding pads to the first extending portions of the ground ring and the second extending portions of the power ring are comparable; a plurality of power vias disposed in the first power ring for connecting the power ring to the power plate, at least two of the power vias being coupled together; a plurality of fingers surrounding the power ring, a first set of bonding wires with a first looping profile electrically connecting the bonding pads to the first serrated extending portions of the ground ring and to the second extending portions of the power ring; a second set of bonding wires with a second looping profile electrically connecting the bonding pads to the fingers; a plurality of solder balls in area array disposed under the lower surface of the substrate for electrically connecting to the ground ring, the power ring and the fingers through vias; a package body encapsulating the chip, bonding wires and the upper surface of the substrate; and a second power ring surrounding the first power ring, the first power ring having a third set of serrated extending portions extending toward the outer edge of the substrate, and the second power ring having a fourth set of serrated extending portions interlacing coincidentally with the extending portions of the third serrated extending portions of the first power ring in a manner that the distances from the bonding pads to the third extending portions of the first power ring and the fourth extending portions of the second power ring are comparable.