A three-way symmetric structure broadband high backoff doherty power amplifier

By designing a three-way symmetrical broadband high backoff Doherty power amplifier, the problem of high design difficulty in broadband in the prior art is solved, and high efficiency and broadband signal processing capabilities are achieved, making it a power amplifier suitable for 5G communication systems.

CN116707452BActive Publication Date: 2026-06-30UNIV OF ELECTRONICS SCI & TECH OF CHINA
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
UNIV OF ELECTRONICS SCI & TECH OF CHINA
Filing Date
2023-05-25
Publication Date
2026-06-30

AI Technical Summary

Technical Problem

Existing Doherty power amplifiers are difficult to design for broadband and have high back-off efficiency in 5G communications. Traditional design methods are difficult to meet signal processing requirements, especially when processing high power peak-to-average ratio signals, where they are inefficient and complex.

Method used

The broadband high back-off Doherty power amplifier with a three-way symmetrical structure includes three equal-division power dividers, a phase compensation network, an input matching network, a carrier power amplifier, a peak power amplifier, a load modulation network, and a post-matching network. The broadband high back-off of the symmetrical structure is achieved through microstrip line design and printed circuit board materials.

Benefits of technology

Maintaining high efficiency within the output power back-off range and effectively extending the operating bandwidth simplifies circuit design, reduces transistor power and current requirements, and improves signal processing capabilities.

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Abstract

This invention relates to the field of front-end active circuit technology, specifically to a three-channel symmetrical broadband high-back-off Doherty power amplifier, comprising a first microstrip line, three equally divided power dividers, a phase compensation network, three input matching networks, a carrier power amplifier, a first peak power amplifier, a second peak power amplifier, a load modulation network, a post-matching network, a DC blocking capacitor, and a second microstrip line. The post-matching network of this invention generates a complex-valued load that varies with frequency at the junction point, compensating for the influence of the peak power amplifier at different offset frequencies, thereby maintaining a small change in the impedance value at the output of the carrier power amplifier and realizing its bandwidth extension function. This solves the problem of high difficulty in implementing broadband design in existing power amplifiers.
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