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Novel broadband three-path Doherty power amplifier and implementation method thereof

A power amplifier and amplifier technology, applied in the field of radio frequency communication, can solve the problems of limited bandwidth, narrow bandwidth, large size, etc., and achieve the effect of increasing the working bandwidth, suppressing the overall bandwidth, and increasing the quality factor

Active Publication Date: 2017-02-15
HANGZHOU DIANZI UNIV
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Problems solved by technology

[0005] However, the three-way Doherty power amplifier in the prior art also has the common problem of the traditional Doherty power amplifier—the problem of narrow bandwidth
The load modulation network of the three-way Doherty power amplifier in the prior art still adopts the common 50-ohm quarter-wavelength impedance converter in the prior art, which leads to relatively large impedance conversion, and therefore greatly limits the bandwidth
At the same time, the size of the prior art Doherty power amplifier is relatively large, which limits its application range to a certain extent

Method used

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  • Novel broadband three-path Doherty power amplifier and implementation method thereof
  • Novel broadband three-path Doherty power amplifier and implementation method thereof
  • Novel broadband three-path Doherty power amplifier and implementation method thereof

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Embodiment Construction

[0034]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.

[0035] Aiming at the defects existing in the prior art, the applicant conducted in-depth research on the structure of the three-way Doherty power amplifier in the prior art, and the applicant found that the four-point One of the wavelength impedance converters has relatively large impedance conversion, so that the impedance conversion ratio of the traditional three-way Doherty power amplifier load modulation network is 9:1 (150 ohms to 16.67 ohms), thereby suppressing the working bandwidth of the three-way Doherty, while the existing The technical load modulation network is usually composed of multiple impedance converters, which increases the size of the Doherty power amplifier, and the compensation line of the auxiliary br...

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Abstract

The invention provides a novel broadband three-path Doherty power amplifier and an implementation method thereof. A three-path halving power divider is used for halving input power and separately outputting the halved input power to a carrier power amplifier circuit, a first peak power amplifier circuit and a second peak power amplifier circuit, and an output end of the carrier power amplifier circuit is connected with a 86.6 Ohm quarter-wave impedance transformer T1, and is connected with the output ends of the first peak power amplifier circuit and the second peak power amplifier circuit to combine to output the power to a load. Compared with the prior art, the load modulation network of the traditional Doherty power amplifier is improved, the impedance transformation ratio of the load modulation network is reduced, the size of the Doherty power amplifier is reduced, and meanwhile a compensation line of a peak branch is added in a peak output matching circuit, thereby reducing the quality factors of the entire peak output matching circuit, and greatly broadening the working bandwidth of the three-path Doherty power amplifier.

Description

technical field [0001] The invention relates to the technical field of radio frequency communication, in particular to a novel broadband three-way Doherty power amplifier and a realization method thereof. Background technique [0002] In the past half a century, radio frequency microwave technology has been developed by leaps and bounds, and is widely used in wireless communication fields such as WLAN, mobile phones, electronic countermeasures, and satellite communications. The RF power amplifier unit is the core component of the wireless communication system. In order to realize long-distance signal transmission and ensure reliable signal reception, a power amplifier must be used in the transceiver components of the wireless communication system to amplify the signal. It can be said that the performance of the power amplifier will directly affect the working status of the entire system, and it is the core component of the RF front-end in the wireless transceiver system. ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H03F1/02H03F1/56H03F1/48H03F3/195H03F3/213
CPCH03F1/0288H03F1/486H03F1/56H03F3/195H03F3/213
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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