Design of Dual-Band Chireix Outphasing Power Amplifier

Abstract

This paper presents a novel dual-band Chireix outphasing power amplifier (PA). π-shaped network is used to design dual-band components. While the paralleled susceptance components can be merged and design together, which simplify the design procedures. Moreover, a symmetrical configuration instead of asymmetric one is added at the combining node to enhance efficiency. Mechanism of the PA is analyzed. The design methodology is formulated. For verification, a prototype operating at 1.6 and 2.2 GHz is simulated with the peak efficiencies of >70.5%, saturated output powers of >43.2 dBm, and 6-dB back-off efficiency of >62%.