High-speed, High-efficiency millimeter-wave transmitters at 45 GHz in CMOS

Millimeter-wave power amplifiers realized in CMOS processes have demonstrated output power and power added efficiency exceeding 20 dBm and 30%, respectively. We describe efforts to achieve high power and high efficiency for mm-wave transmitters and linearize mm-wave PAs in fineline CMOS processes. We will present novel circuit approaches based on Doherty amplifiers and digital pre-distortion of high-power mm-wave CMOS PA to demonstrate low error-vector magnitude (EVM).