Patent ID: 8912647

Claim:
A semiconductor device comprising: a high frequency semiconductor chip; an input matching circuit disposed at an input side of the high frequency semiconductor chip; an output matching circuit disposed at an output side of the high frequency semiconductor chip; a high frequency input terminal connected to the input matching circuit; a high frequency output terminal connected to the output matching circuit; and a smoothing capacitor terminal connected to the high frequency semiconductor chip, wherein the high frequency semiconductor chip, the input matching circuit and the output matching circuit are housed by one package, and the high frequency semiconductor chip comprises a semi-insulating substrate; a gate finger electrode, a source finger electrode, and a drain finger electrode configured to be disposed on a first surface of the semi-insulating substrate, and configured to have a plurality of fingers, respectively; a plurality of gate terminal electrodes, a plurality of source terminal electrodes, and a drain terminal electrode configured to be disposed on the first surface of the semi-insulating substrate, and configured to tie a plurality of fingers, respectively for each of the gate finger electrode, the source finger electrode, and the drain finger electrode; VIA holes, each configured to be disposed at a lower part of each source terminal electrode; and a ground electrode configured to be disposed on a second surface of the opposite side of the first surface of the semi-insulating substrate, and configured to be connected via the VIA holes to the source terminal electrodes.