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Doherty power amplifier

A technology for power amplifiers and differential amplifiers, applied in differential amplifiers, DC-coupled DC amplifiers, improved amplifiers to improve efficiency, etc., can solve the problems of poor load modulation effect and no obvious improvement in back-off efficiency, and reduce the area , reduce the capacitor connection wiring, improve the effect of phase balance

Active Publication Date: 2022-07-22
SOUTH CHINA UNIV OF TECH
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  • Claims
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Problems solved by technology

However, because the load modulation network of the dual adaptive bias Doherty power amplifier structure uses transmission line matching, the load modulation effect is poor, so the back-off efficiency has not been significantly improved

Method used

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Embodiment Construction

[0038] In order to make those skilled in the art better understand the solutions of the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are only The embodiments are part of the present application, but not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative work shall fall within the protection scope of the present application.

[0039] The terms "first", "second", "third" and "fourth" in the description and claims of the present application and the drawings are used to distinguish different objects, rather than to describe a specific order . Furthermore, the terms "comprising" and "having" and any variations thereof are intended to cover non-exclusive ...

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Abstract

The invention discloses a Doherty power amplifier which comprises a quadrature coupler which comprises a first coupling inductor and a second coupling inductor, and the quadrature coupler is used for dividing an input signal into a first signal and a second signal; the first amplifying circuit is used for amplifying the first signal; the second amplifying circuit is used for amplifying the second signal; and the load modulation network is an output voltage synthesis type Doherty load modulation network adopting T-type model equivalence. The overlapped part of the coupling inductor is used for providing distributed stray capacitance, so that an extra capacitor does not need to be arranged in the orthogonal coupler, and the area is reduced; a quarter-wavelength line is equivalent to the load modulation network provided by the embodiment of the invention through the T equivalent model, and multiple inductors are combined into a transformer with a smaller area, so that the area of a Doherty structure is reduced while the rollback efficiency of the power amplifier is improved, the connection loss is reduced, and the overall performance of the power amplifier is improved.

Description

technical field [0001] The invention relates to the technical field of electronic communication, in particular to a Doherty power amplifier. Background technique [0002] In recent years, the development of the fifth-generation mobile communication technology has put forward higher requirements for the bandwidth and rate of data transmission, among which the radio frequency front-end transceiver system is currently the research hotspot of 5G communication. In the RF front-end transceiver system, the main characteristic of the power amplifier is to amplify the RF signal to a certain power level and reduce the DC power consumption as much as possible. Therefore, the performance of the power amplifier determines the main performance of the transceiver transmit path. In RF systems, the power amplifier is located at the end of the transmitter, and its output power determines the distance the signal travels in the air. In addition, in order to reduce the overall power consumptio...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H03F1/02H03F1/56H03F3/45
CPCH03F1/0288H03F1/565H03F3/45475
Inventor 薛泉陈嘉文朱浩慎
Owner SOUTH CHINA UNIV OF TECH
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