Patent ID: 6495915
Filing Date: 2002-12-17
Classification: H01L

Abstract:
A flip chip package of monolithic microwave integrated circuit (MMIC) comprising:a substrate, having an top surface and a bottom surface, and each of the surfaces is divided respectively into a periphery area and a central area; an integrated circuit chip (IC chip), having a first surface and a second surface, and each of the surfaces being divided respectively into a periphery area and a central area, and an MMIC package being made by flipping the IC chip to have its first surface covering on the top surface of the substrate, and the central area of the first surface having one or several active devices; a plurality of metal strips, positioned on the IC chip's first surface and disposed in the periphery area of the IC chip's first surface, and these metal strips being electrically connected to the active devices on the first surface of the IC chip, wherein some of metal strips disposed in the periphery area of the IC chip's first surface are arranged in a ground-signal-ground or signal-ground pattern; a plurality of solder bumps, implanted respectively on and being electrically connected to the first surface's metal strips of the plurality of IC chips; a plurality of metal strips of the substrate's top surface, disposed in the periphery area of the substrate's top surface, and these metal strips being electrically connected to the plurality of solder bumps; a plurality of metal strips of the substrate's bottom surface, disposed in the periphery area of the substrate's bottom surfaces; a plurality of via holes, penetrating through the substrate and being electrically connected to the plurality of metal strips on the substrate's top surface and to the plurality of metal strips on the substrate's bottom surface respectively; and an underfill, filling the solder bumps and the plurality of the metal strips which are connected to the solder bumps and are positioned on the IC chip's first surface, also filling all the chinks around the top surface's metal strips of the substrate, and covering the whole IC chip up to a height that is slightly higher than the thickness of the IC chip; wherein both some of the plurality of metal strips disposed in the periphery area of the substrate's top and bottom surfaces are arranged in a ground-signal-ground or a signal-ground pattern.