1.2–2.8-GHz 32.4-dBm Digital Power Amplifier With Balance-Compensated Matching Network

In this letter, a wideband watt-level digital power amplifier (DPA) with balance-compensated matching network is proposed for polar transmitters. The balance response of the differential to single-ended transformer enhanced by series-loaded compensation capacitor, which leads improvement DPA efficiency. To verify mechanisms, prototype fabricated in conventional 40-nm CMOS technology. operates over 1.2-2.8 GHz and exhibits peak output 32.4 dBm at 2 drain efficiency 53.8% 1.8 GHz. It supports 50-MHz 64-quadratic-amplitude modulation (QAM) average (P avg ) 25.37 dBm, error vector magnitude (EVM) -26.97 dB, adjacent channel ratio (ACPR) -29.61 dBc, 10-MHz 1024-QAM P 22.14 EVM -35.75 ACPR -35.37 respectively.