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Doherty power amplifier

A power amplifier and amplifier technology, applied in power amplifiers, improving amplifiers to improve efficiency, improving amplifiers to reduce nonlinear distortion, etc., can solve the problems of poor linearity, poor linearity, and imperfect methods of Doherty power amplifiers. Achieve obvious social value, reduce energy consumption and save operating costs

Inactive Publication Date: 2016-01-13
AIR FORCE UNIV PLA
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  • Summary
  • Abstract
  • Description
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AI Technical Summary

Problems solved by technology

[0004] Since the peak amplifier in the Doherty power amplifier works in class C, the linearity of the Doherty power amplifier is poor, and its IMD3 and ACLR are generally around -30dBc
At present, using Derivate Superposition Technique (DerivateSuperpositionTechnique, DST), Doherty power amplifiers have been improved to some extent in the study of linearity, but the method is not perfect, and the linearity is not very good.

Method used

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Embodiment Construction

[0038] In order to make the objects and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the examples. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention.

[0039] Such as figure 1 As shown, the embodiment of the present invention provides a Doherty power amplifier, including a circuit board and a

[0040] The unequal power divider 101 has an input terminal for receiving radio frequency input signals, an isolation terminal connected to the first load, and an output terminal including a 0-degree output terminal and a 90-degree output terminal, wherein the 0-degree output terminal and the 90-degree output terminal are The output signal energies are not equal.

[0041] Specifically, in order to realize the combination of optimal linearity and efficiency of Doherty power amplifier, the driving power d...

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Abstract

The invention discloses a Doherty power amplifier, comprising a circuit board, an unequal power allocator installed on the circuit board, a prepositive delay line, a plurality of input matching circuits, at least one carrier amplifier, at least one peak amplifier, a plurality of output matching circuits, a constant current bias device and a compensation line. The Doherty power amplifier disclosed by the invention can simultaneously solve the two problems of power amplification efficiency and linearity. The internal linear technology of the Doherty power amplifier is adopted, so that the linearity of the Doherty power amplifier can be better than that of an AB type power amplifier while having high efficiency, and the adopted circuit board has good corrosion resistance, fire resistance, toughness and stability.

Description

technical field [0001] The invention relates to the technical field of wireless communication, in particular to a Doherty power amplifier Background technique [0002] Doherty technology was proposed by Doherty in 1936. Doherty technology is a common technology to improve the efficiency of power amplifiers. It controls the conduction or non-conduction of two power amplifiers (main amplifier and auxiliary amplifier) ​​at different power levels to obtain higher power amplifiers. The total efficiency of the Doherty technology is simple to implement and has good broadband characteristics, making it one of the most general efficiency enhancement technologies. The linear characteristics of the Doherty amplifier are completely determined by the carrier amplifier. The peak amplifier and the carrier amplifier should use appropriate gate bias to generate harmonic cancellation and improve the linear characteristics of the Doherty amplifier. [0003] The linearity of the early Doherty ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H03F1/07H03F1/32H03F3/20
Inventor 向永波王光明梁建刚张小宽
Owner AIR FORCE UNIV PLA
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