Design of a Wideband Doherty Power Amplifier with High Efficiency for 5G Application

Author:

Nasri AbbasORCID,Estebsari MotahharehORCID,Toofan SiroosORCID,Piacibello AnnaORCID,Pirola MarcoORCID,Camarchia VittorioORCID,Ramella ChiaraORCID

Abstract

This paper discusses the design of a wideband class AB-C Doherty power amplifier suitable for 5G applications. Theoretical analysis of the output matching network is presented, focusing on the impact of the non-ideally infinite output impedance of the auxiliary amplifier in back off, due to the device’s parasitic elements. By properly accounting for this effect, the designed output matching network was able to follow the desired impedance trajectories across the 2.8 GHz to 3.6 GHz range (fractional bandwidth = 25%), with a good trade-off between efficiency and bandwidth. The Doherty power amplifier was designed with two 10 W packaged GaN HEMTs. The measurement results showed that it provided 43 dBm to 44.2 dBm saturated output power and 8 dB to 13.5 dB linear power gain over the entire band. The achieved drain efficiency was between 62% and 76.5% at saturation and between 44% and 56% at 6 dB of output power back-off.

Publisher

MDPI AG

Subject

Electrical and Electronic Engineering,Computer Networks and Communications,Hardware and Architecture,Signal Processing,Control and Systems Engineering

Reference38 articles.

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1. A Broadband Three-Way Series Doherty Power Amplifier with Deep Power Back-Off Efficiency Enhancement for 5G Application;Electronics;2024-05-11

2. Design of Broadband Doherty Power Amplifier Based on Misaligned Current Phase;Energies;2024-04-24

3. High-Efficiency GaN Doherty Power Amplifier based on Inverse Class-F Operation;2024 IEEE Topical Conference on RF/Microwave Power Amplifiers for Radio and Wireless Applications (PAWR);2024-01-21

4. Assessment of the Performance of Inverse Class-F Power Amplifiers in a Discrete Doherty Architecture;2023 International Workshop on Integrated Nonlinear Microwave and Millimetre-Wave Circuits (INMMIC);2023-11-08

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