Fully-integrated CMOS differential class-E Power Amplifier with combined waveform-shaping network and transformer-based balun

This paper presents the design of a transformer-based, differential, 1.8 GHz fully-integrated CMOS class-E Power Amplifier (PA) with 29dBm output power and power-added efficiency of 38.7%. In the proposed architecture, a novel output circuit is developed to serve as both the power combining device as well as waveform-shaping network, which offers smaller footprint and reduced power loss. For validation, the measured results of the proposed PA implemented using 0.35 µm CMOS technology are given.