Patent ID: 8218328

Claim:
A semiconductor device, comprising: (a) a first semiconductor chip having an integrated circuit formed therein to serve as a power amplifier; and (b) a rectangular wiring board including a chip mounting surface for mounting the first semiconductor chip thereover, and a back surface opposite to the chip mounting surface, said wiring board having the first semiconductor chip mounted over the chip mounting surface, wherein the back surface of the wiring board comprises: (b1) a central ground terminal formed in a center of the back surface, and to which a ground potential is applied; and (b2) a plurality of peripheral terminals formed around a perimeter of the wiring board so as to surround the central ground terminal, wherein the peripheral terminals includes a first peripheral ground terminal and a second peripheral ground terminal which are arranged adjacent to each other, and to each of which the ground potential is applied, wherein the first peripheral ground terminal and the second peripheral ground terminal are electrically coupled together by a conductor pattern formed at the back surface, and wherein a width of the conductor pattern is smaller than a width of each of the first peripheral ground terminal and the second peripheral ground terminal.