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Wideband Doherty Power Amplifier: A Design Approach.

Jorge Julián Moreno Rubio¹, Edison Ferney Angarita Malaver¹, Luis Ángel Lara González²

¹Grupo de Investigación en Telecomunicaciones-GINTEL, Universidad Pedagógica y Tecnológica de Colombia, Sogamoso 152211, Colombia.

|April 23, 2022

Summary

This study introduces a straightforward method for designing wideband Doherty power amplifiers (DPAs) using a novel combiner network. The approach achieves 1.4 GHz bandwidth with high efficiency and output power, demonstrating its effectiveness for GaN HEMT devices.

Keywords:

GaN-based FETs broadband matching networks wideband Doherty power amplifier

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Area of Science:

Electrical Engineering
RF and Microwave Engineering

Background:

Doherty power amplifiers (DPAs) are crucial for efficient power amplification in wireless communication systems.
Designing wideband DPAs presents challenges due to device parasitic effects and the need for broadband matching networks.

Purpose of the Study:

To present a simple and effective method for designing wideband Doherty power amplifiers (DPAs).
To achieve wide bandwidth, high efficiency, and high output power in DPAs by synthesizing a specialized combiner network.

Main Methods:

The proposed method involves synthesizing a combiner network that effectively compensates for the device's reactive output network.
The design exploits the maximum power capabilities of Gallium Nitride High Electron Mobility Transistor (GaN HEMT) devices.
Simulations were performed using Wolfspeed's CGH40006 and CG2H40025 GaN HEMT devices.

Main Results:

A wide bandwidth of 1.4 GHz was achieved for both designed DPAs.
Efficiencies exceeding 44% and 49% at 6 dB Output Back-Off (OBO) were obtained.
Saturated output power remained above 41.2 dBm and 47 dBm across the band for the respective devices.

Conclusions:

The proposed combiner network synthesis method is effective for designing wideband DPAs.
The approach enables high performance in terms of bandwidth, efficiency, and output power.
This method offers a valuable technique for developing advanced power amplifiers for modern communication systems.