Patent ID: 8324707

Claim:
A power amplifier, comprising: at least one first structure being bounded by a semiconductor layer of a first conductivity type, and the first structure including a first body contact of the first conductivity type, a first drain, a first gate, a first source, and a first deep well of a second conductivity type, and the first structure being arranged in a polygonal shape having n corners or in an annular shape in such a manner that the first body contact is located on the inner side and the first deep well is located on the outer side, the first drain, the first gate and the first source being located between the first body contact and the first deep well, n being an integer equal to or greater than 3; and a plurality of second structures being bounded by of the semiconductor layer and being arranged adjacently around the first structure in a surrounding manner, each of the plurality of second structures including a second body contact of the first conductivity type, a second drain, a second gate, a second source, and a second deep well of the second conductivity type, and each of the plurality of second structures being arranged in the polygonal shape having n corners or in the annular shape in such a manner that the second body contact is located on the inner side and the second deep well is located on the outer side, the second drain, the second gate and the second source being located between the second body contact and the second deep well, wherein, when the first structure performs a power amplification operation, the plurality of second structures are depleted by applying a reverse bias to the plurality of second structures, and the plurality of depleted second structures isolate the first structure from a surrounding portion.