A 5-GHz fully integrated CMOS class-E power amplifier using self-biasing technique with cascaded class-D drivers

This paper describes the design of 5-GHz fully integrated CMOS class-E single-ended power amplifier (PA) for wireless transmitter applications in a 0.18-μm CMOS technology. The proposed class-E PA employs the cascode topology with a self-biasing technique to reduce device stress. Three cascaded class-D driver amplifiers are used to actualize the sharp switching at the class-E power stage. All device components are integrated on chip and the chip area is 1.0×1.3 mm². The measurement results indicate that the PA delivers 16.4 dBm output power and 35.4 % power-added efficiency with 2.3 V power supply voltage into a 50 Ω load.