Patent ID: 6175287
Filing Date: 2001-01-16
Classification: H01L

Abstract:
A microwave structure comprising:an integrated circuit (IC) having the form of a chip, a carrier substrate for supporting the IC, and a multiplicity of conductive connective bumps disposed between the IC and the substrate, the IC having a front side and a back side, the substrate having a front side and a back side, the back side of the IC facing the front side of the substrate;wherein said IC comprises a circuit terminal at the front side of said IC, a ground plane at the back side of said IC, and an electrically conductive via extending to the back side of said IC from said circuit terminal at the front side of said IC, said ground plane being patterned with an annular aperture which defines a pad connecting with said via at the back side of said IC, said aperture insulating said via from said ground plane;said substrate comprises a conductive signal line, and an electrically conductive layer covering a portion of the front side of said substrate and being spaced apart from said conductive line;said conductive layer of said substrate underlies a portion of said ground plane of said IC, and said conductive line extends toward said pad;said multiplicity of bumps includes a first set of bumps and a second set of bumps, said first set of bumps having at least one bump and said second set of bumps having a plurality of bumps, said first set of bumps joining the pad of said IC to said conductive line of said substrate, and said second set of bumps joining the ground plane of said IC with the conductive layer of said substrate; andsaid substrate comprises a further ground plane located at the back side of said substrate and a plurality of electrically conductive vias interconnecting said further ground plane with said conductive layer, said conductive layer and said via of said IC and said vias of said substrate defining a continuous thermal path for conduction of heat of said IC to said further ground plane.