Optimization of Harmonic Injection Networks in Doherty Power Amplifiers

Abstract

The Doherty Power Amplifier (DPA) is a pivotal component in modern wireless communication, offering enhanced efficiency and linearity. However, traditional DPAs face challenges related to harmonic distortion and power efficiency at back-off power levels. This paper presents an in-depth study on the optimization of harmonic injection networks (HINs) in DPAs to mitigate these issues. We propose a novel harmonic injection methodology that utilizes advanced network design techniques to improve performance metrics such as efficiency, linearity, and bandwidth. Experimental results demonstrate significant improvements in the overall performance of DPAs equipped with optimized HINs compared to conventional designs.