Patent ID: 8106503

Claim:
A high frequency semiconductor device comprising: a distribution/input matching circuit board that mounts thereon a distribution/input matching circuit and an input transmission line pattern; an input capacitor board that is arranged adjacent to the distribution/input matching circuit board, and mounts a plurality of input capacitor cells thereon; a semiconductor board that is arranged adjacent to the input capacitor board, and mounts a plurality of field effect transistor cells thereon; an output capacitor board that is arranged adjacent to the semiconductor board, and mounts a plurality of output capacitor cells thereon; and a synthesis/output matching circuit board that is arranged adjacent to the output capacitor board, and mounts thereon an output transmission line pattern and a synthesis/output matching circuit, wherein the number of active field effect transistor cells is changed by connecting and disconnecting a plurality of field effect transistor cells to one another in response to a desired output power value, whereby a total gate electrode length is substantially changed, and an output power value is adjusted.