A 31.2dBm Pout, 40.7% Peak DE, 2.4GHz Quadrature Doherty Power Amplifier Based on Current Mode RFDAC Architecture

A fully integrated quadrature radio frequency power amplifier based on current mode RFDAC architecture is presented. With the assistance of Doherty technology, its drain efficiency (DE) at 6dB power back-off (PBO) is enhanced. Designed in a 28nm CMOS process, the simulation results show that its peak output power and peak DE reaches 31.2dBm and 40.7% under 2.4GHz, respectively. Meanwhile, it can maintain less than 0.14dB AM-AM and less than 5.7° AM-PM throughout its whole operation without digital predistortion (DPD), the DE at 6dB PBO of this power amplifier is 40.4%.