Patent ID: 8610507

Claim:
A power amplifier comprising: an MMIC substrate; a high frequency probe pad disposed on the MMIC substrate; a metal plate disposed on the MMIC substrate so as to adjoin to the high frequency probe pad, and connected to an MMIC external circuit via a first bonding wire; a pair of ground terminal electrodes disposed on a first surface of the MMIC substrate to adjoin to the high frequency probe pad; VIA holes disposed at a lower part of the respective ground terminal electrodes; and a back side surface ground electrode disposed on a second surface opposite to the first surface of the MMIC substrate, and connected to the respective ground terminal electrodes via the respective VIA holes, wherein a signal terminal of high frequency probe can be connected to the high frequency probe pad GP, and a pair of ground terminals of high frequency probe can be connected to the pair of the ground terminal electrodes.