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Real-Time DC-dynamic Biasing Method for Switching Time Improvement in Severely Underdamped Fringing-field Electrostatic MEMS Actuators

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A Dual Load-Modulated Doherty Power Amplifier Design Method for Improving Power Back-Off Efficiency.

Yi Jin¹, Zhijiang Dai², Xiongbo Ran²

¹Xi'an Branch of China Academy of Space Technology, Xi'an 710199, China.

Sensors (Basel, Switzerland)

|July 29, 2023

Summary

This study introduces a dual load-modulated Doherty power amplifier (D-DPA) design to overcome low efficiency in back-off states. The novel D-DPA method enhances peaking power amplifier efficiency, improving overall DPA performance.

Keywords:

Doherty efficiency enhancement load modulation power amplifier (PA)

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Area of Science:

Electrical Engineering
RF and Microwave Engineering

Background:

Doherty power amplifiers (DPAs) often exhibit poor efficiency at reduced output power levels.
Understanding the load modulation process is crucial for optimizing DPA performance.

Purpose of the Study:

To analyze the load modulation process in DPAs and identify causes of low back-off efficiency.
To propose a new design method, the dual load-modulated DPA (D-DPA), for enhanced back-off efficiency.

Main Methods:

Derivation of a general formula for the real load modulation process.
Development of the D-DPA design methodology, controlling load modulation between carrier and peaking PAs.
Fabrication and testing of a 2 GHz D-DPA prototype.

Main Results:

The proposed D-DPA design successfully enhances the efficiency of the peaking PA in the back-off region.
The fabricated 2 GHz D-DPA achieved 43.7 dBm saturated output power and 9.7 dB gain.
An efficiency of 59.2% was recorded at 6 dB output power back-off, eliminating the traditional DPA efficiency pit.

Conclusions:

The D-DPA design method effectively improves the back-off efficiency of Doherty power amplifiers.
This approach offers a valuable strategy for developing more efficient power amplifiers for various applications.