A CMOS class-E power amplifier of 40-% PAE at 5 GHz for constant envelope modulation system

This paper describes the design of a high-efficient class-E power amplifier (PA) for 5-GHz wireless transmitter applications using constant envelope modulation scheme in a 0.18-μm CMOS technology. The proposed class-E PA employs injection-locking technique to reduce required input power. Furthermore, cascode topology is utilized for the proposed PA in order to reduce device stress and parasitic capacitances. The proposed PA delivers 15.4-dBm saturated output power at 5.0 GHz with 40.6-% maximum power-added efficiency (PAE) for measurement.