A doherty power amplifier with improved power back-off dynamic range and its implementation method

A power amplifier and a power-enhancing technology, which is applied in the field of radio frequency communication, can solve the problems of reducing power utilization factor and Doherty power amplifier gain reduction, etc.

Active Publication Date: 2019-01-01
HANGZHOU DIANZI UNIV
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Problems solved by technology

[0004] In order to increase the power fallback range of Doherty power amplifiers, communication providers generally use asymmetric transistors, that is, the peak power amplifier uses a tube with a larger power capacity, and at the same time uses an unequal power divider at the input end to improve the power fallback range, but this introduces new problems, such as reduced overall Doherty amplifier gain, reduced power utilization factor, etc., especially at low input power

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  • A doherty power amplifier with improved power back-off dynamic range and its implementation method
  • A doherty power amplifier with improved power back-off dynamic range and its implementation method
  • A doherty power amplifier with improved power back-off dynamic range and its implementation method

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Embodiment Construction

[0029] The following are specific embodiments of the present invention and in conjunction with the accompanying drawings, the technical solutions of the present invention are further described, but the present invention is not limited to these embodiments.

[0030] Aiming at the defects existing in the prior art, the applicant conducted in-depth research on the structure of the Doherty power amplifier in the prior art, and the applicant found that the load impedance of the carrier power amplifier of the traditional Doherty power amplifier at the back-off point was 100 ohms, which caused the traditional Doherty power amplifier to When the power amplifier maintains high efficiency, the output power drops back by at most 6dB, which is difficult to meet the requirements of today's wireless communication systems.

[0031] In order to overcome the defects of the prior art, this application adopts a new type of load modulation network to increase the load impedance of the main power a...

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Abstract

The present invention provides a Doherty power amplifier with improved power back-off dynamic range and its implementation method, including an equalized Wilkinson power divider, a carrier power amplifier circuit, a peak power amplifier circuit and a novel load modulation network, wherein the equalized power The Erkinson power divider is used to divide the input power into equal parts and then output them to the carrier power amplifier circuit and the peak power amplifier circuit respectively. The output terminals of the amplifying circuit are connected to output the combined power to the load. Compared with the prior art, the invention improves the load modulation network of the traditional Doherty power amplifier, increases the load impedance of the main power amplifier under low input power state, and improves the high-efficiency power back-off range of the Doherty power amplifier.

Description

technical field [0001] The invention relates to the technical field of radio frequency communication, in particular to a Doherty power amplifier for improving the dynamic range of power back-off and a realization method thereof. Background technique [0002] With the rapid development of wireless communication technology, radio frequency microwave technology is becoming more and more important in people's daily life. In order to transmit as much data as possible within a limited spectrum bandwidth, communication providers usually use very complex modulation methods, which will lead to a larger peak-to-average ratio (PAPR) of the signal, while using traditional power amplifiers such as class A, Class AB is very inefficient for amplifying non-constant envelope signals, especially at high power backoffs. The RF power amplifier with high efficiency and high linearity has become one of the research hotspots in academia and industry. Doherty power amplifiers have become the main...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H03G3/20H03F1/07
CPCH03F1/07H03G3/20
Inventor 程知群张明刘国华董志华周涛柯华杰
Owner HANGZHOU DIANZI UNIV
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