A multi-band CMOS Doherty PA with tunable matching network

This paper present a multi-band Doherty power amplifier (DPA) implemented in a 0.18um CMOS SOI. In order to enable the multi-band operation, the proposed DPA employs tunable matching networks with digital controls that are set via serial RFFE commands. Using digital pre-distortion (DPD) techniques, the proposed Doherty PA improves efficiency over a wide output power range and over multiple bands of operation. By utilizing linearizer circuits, tunable matching networks and DPD, the measured PAE with the R99 modulated signal can be as high as 50.1% at 27.8dBm output power while meeting ACP specifications.