A broadband three-way doherty power amplifier and its realization method

Abstract

The present invention provides a broadband three-way Doherty power amplifier and its implementation method, wherein the three-way equal power divider is used to divide the input power into equal parts and output them to the carrier power amplifier circuit, the first peak power amplifier circuit and the second peak power amplifier circuit respectively. Peak power amplification circuit, the output terminal of the carrier power amplification circuit is connected to the 86.6 ohm quarter-wavelength impedance converter T1, and is connected with the output terminals of the first peak power amplification circuit and the second peak power amplification circuit to output the power to load. Compared with the prior art, the present invention reduces the impedance conversion ratio of the load modulation network and reduces the size of the Doherty power amplifier by improving the load modulation network of the traditional three-way Doherty power amplifier, and simultaneously adds the compensation line of the peak branch to the In the peak output matching circuit, reducing the quality factor of the overall peak output matching circuit greatly widens the operating bandwidth of the three-way Doherty power amplifier.

Description

technical field [0001] The invention relates to the technical field of radio frequency communication, in particular to a 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. [0003]...

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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