Harmonic control based efficient Doherty power amplifier

Abstract

The present invention provides a harmonic control based efficient Doherty power amplifier. The harmonic control based efficient Doherty power amplifier includes an equal Wilkinson power splitter, a carrier power amplification circuit, a peak power amplification circuit, and a load modulation network. The equal Wilkinson power splitter is used for equally dividing an input power and then outputting the equally divided input power to the carrier power amplification circuit and the peak power amplification circuit. The output end of the carrier power amplification circuit and the output end of the peak power amplification circuit are connected with the load modulation network. The load modulation network outputs the power to a load. Compared with the prior art, a harmonic control circuit is used in an class E power amplifier to control a high-order harmonic, a load impedance is converted to a required fundamental wave impedance by a harmonic control network, an open circuit is on odd harmonic frequency, and short circuit is on even-number harmonic frequency, so that waveform shaping is realized, theoretically, a power amplification transistor has no power loss, and ideal drain efficiency of the power amplifier can reach 100%.

Description

technical field [0001] The invention relates to the technical field of radio frequency communication, in particular to a high-efficiency Doherty power amplifier based on harmonic control. Background technique [0002] In recent years, wireless communication technology has been greatly developed, and the modulation methods are becoming more and more complex. The power amplifier, as the final module in the transmitter, is the component with the largest power consumption in the entire radio frequency system. Its main function is to amplify the power of the signal output by the previous stage, and then send the amplified signal to the antenna for transmission. Since the power amplifier consumes a lot of DC power, the efficiency is the first important index to be considered in the design of the power amplifier, and the linearity is also a key index of the power amplifier. This is mainly reflected in the following aspects: (1) The linearity of the power amplifier. Since the late...

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Problems solved by technology

[0004] The traditional Doherty power amplifier carrier power amplifier is biased in class AB working mode, and the peak power amplifier is biased in class C working mode, so the maximum saturation efficiency and fallback efficiency of traditional Doherty power amplifier can only reach 78.5%.

At the same time, the current carrier power amplifier and peak power amplifier in the Doherty power amplifier only consider the fundamental wave matching and do not consider the improvement of the efficiency of the harmonic control. The focus of Doherty's research is how to improve the fallback efficiency of the power amplifier.

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