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

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. ...

AI Technical Summary

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

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