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Doherty amplifier based on Legendre impedance converter

A technology of impedance converter and amplifier, which is applied in amplifiers, amplifier combinations, improved amplifiers to expand bandwidth, etc. It can solve the problems of narrow bandwidth and limit the scope of application of Doherty, and achieve high saturated power, simple structure, and high back-off efficiency. Effect

Active Publication Date: 2020-09-01
SHANGHAI UNIV +1
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  • Claims
  • Application Information

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Problems solved by technology

So this requires that the auxiliary amplifier 14 needs to work in the class C state, and the class C amplifier will gradually turn on as the input signal power increases, while the main power amplifier 15 is working in the class AB state, but the traditional quarter-wavelength The bandwidth of the transmission line is relatively narrow, which greatly limits the scope of application of the traditional Doherty

Method used

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  • Doherty amplifier based on Legendre impedance converter
  • Doherty amplifier based on Legendre impedance converter
  • Doherty amplifier based on Legendre impedance converter

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Embodiment Construction

[0027] In view of the deficiencies in the prior art, the inventor of this case was able to propose the technical solution of the present invention after long-term research and extensive practice. The technical solution, its implementation process and principle will be further explained as follows.

[0028] The main purpose of the embodiments of the present invention is to provide a Doherty amplifier based on a Legendre impedance converter, which includes:

[0029] A power distribution module, which is at least used to separate the received part of the signal to be amplified and input it to the first power amplifier module and the second power amplifier module respectively;

[0030] The first power amplifier module, which includes at least one first power amplifier, the first power amplifier is respectively connected to the first output end of the power distribution module and the first input end of the combiner module, and is at least used to receive power from the power distr...

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Abstract

The invention discloses a Doherty amplifier based on a Legendre impedance converter. The amplifier comprises a power distribution module, a first power amplifier module, a second power amplifier module, a compensation module and a combining module; the power distribution module is at least used for separating part of received signals to be amplified and then inputting the signals to be amplified into the first power amplifier module and the second power amplifier module; the combining module is at least used for combining amplified signals output by the first power amplifier module and the second power amplifier module and then outputting combined amplified signals, the combining module comprises at least two Legendre impedance converters, and each of the first power amplifier module and the second power amplifier module is connected with at least one Legendre impedance converters. The Doherty amplifier provided by the embodiment of the invention is simple in structure, can provide higher saturation power, wider bandwidth and higher fallback efficiency, and has a wide application prospect in the field of 5G base stations.

Description

technical field [0001] The invention particularly relates to a Doherty amplifier based on a Legendre impedance converter, belonging to the technical field of power amplifiers. Background technique [0002] The theory of Dohert power amplifier was proposed by W.H.Doherty. Its purpose is to solve the shortcoming of low efficiency when the ordinary Class AB power amplifier works at the power back-off point. The traditional Doherty power amplifier consists of a main power amplifier and an auxiliary power amplifier. . [0003] The circuit structure of the traditional Doherty amplifier is as follows: figure 1 As shown, the input signal separation unit 12 divides the signal into two paths, which are respectively used to drive the main power amplifier 15 and the auxiliary power amplifier 14. The main power amplifier 15 is connected with the auxiliary power amplifier 14 through the first quarter-wavelength transmission line 16, and the second A quarter-wavelength transmission line ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H03F1/02H03F1/42H03F3/68
CPCH03F1/0288H03F1/42H03F3/68Y02D30/70
Inventor 赵俊君宋贺伦李冬梅茹占强吴菲胡震宇张立强刘登科张耀辉
Owner SHANGHAI UNIV
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