Huawei and the University of Pavia present a SiGe power amplifier at 80GHz. A common-base output stage causes the DC current to track the signal current and improve efficiency at back-off power. Realized prototype shows OP1dB of 18dBm with Psat of 19dBm. The efficiency at OP1dB and at 6dB are 22% and 8.5%, respectively.