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Broadband high-efficiency power amplifier with active load modulation

A technology for power amplifiers and active loads, applied in the direction of power amplifiers, high-frequency amplifiers, amplifiers, etc.

Active Publication Date: 2017-05-17
UNIV OF ELECTRONICS SCI & TECH OF CHINA
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The present invention overcomes the disadvantages of passive matching network design in traditional designs, provides a power amplifier including active load modulation, and solves the problems of wider bandwidth and higher efficiency

Method used

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  • Broadband high-efficiency power amplifier with active load modulation
  • Broadband high-efficiency power amplifier with active load modulation
  • Broadband high-efficiency power amplifier with active load modulation

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Embodiment Construction

[0019] The technical solution of the present invention is: the basic principle of active load impedance modulation is to change the equivalent impedance of a certain port through the current summing node. as attached image 3 As shown, when the frequency of the modulator output signal is the same as the output frequency of the power amplifier, by changing the modulator output current I m Equivalent load Z on the output port of the power amplifier L1 Perturbation is performed to achieve the purpose of impedance modulation. The goal of impedance modulation is to achieve the optimal impedance Z required for power amplifier operation Lopt . The optimal load impedance can be screened according to efficiency, output power, linearity and other indicators, and it is different according to the determined power amplifier type, which can be determined according to theoretical calculation or load pulling method. This study does not presuppose the type of high-efficiency power amplifie...

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Abstract

The invention discloses a broadband high-efficiency power amplifier with active load modulation and belongs to the key technology of broadband high-efficiency power amplifiers in transmitters. An active load impedance modulation method is provided for the power amplifier, and a transistor is allowed to obtain optimal load impedance in the work band width indirectly through a matching network. According the application experience of a Doherty power amplifier, the used active load modulation technology can manually change the visual-in impedance of one node in a circuit. Therefore, the active load modulation technology can also be used for eliminating the impedance errors of inactive network matching when the power amplifier works under ultra-wide band, the optimal impedance needed by a power amplifier end face can be achieved by the aid of the technology, and the power amplifier can efficiently work in large band width.

Description

technical field [0001] The invention studies the key technology of the broadband high-efficiency power amplifier in the transmitter, and provides the latest method of the broadband high-efficiency power amplifier. Background technique [0002] With the development of electronic systems, the requirements for transmitter efficiency, bandwidth and software configurability become higher. Because the design of the power amplifier has the characteristics of mutual restriction of power, bandwidth, efficiency and linearity index, the existing transmitter structure is difficult to meet the most ideal requirements of the system. Therefore, the difficulty of realizing an ideal transmitter mainly focuses on the structural design and analysis theory based on power amplifiers, which is also one of the biggest obstacles to high-performance software-configurable radio frequency. [0003] The research on broadband high-efficiency transmitters is mainly divided into three aspects: one is res...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04B1/04H03F3/24H03F3/21H03F3/19H03F1/56H03F1/48H03F1/02
CPCH03F1/0211H03F1/48H03F1/56H03F3/19H03F3/21H03F3/24H03F2200/451H04B1/0458H04B2001/0408
Inventor 游飞李朔何松柏李川
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA
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