Implementation method of high-efficiency Doherty power amplifier based on switching resonant structure

Abstract

The invention relates to an implementation method of a high-efficiency Doherty power amplifier based on a switching resonant structure. The switching resonant structure for inhibiting the higher harmonic component of an auxiliary power amplifier is arranged behind the auxiliary power amplifier so that the auxiliary power amplifier realizes class E work; the switching resonant structure comprises a switch, and a resistor, a capacitor and an inductor, the three of which are connected with the switch; an inductance value is optimized to enable a signal to resonate under a fundamental frequency, and therefore, a high impedance characteristic is presented to harmonics and an orthogonal relation between the time domain voltage and the current waveform of an ideal class E amplifier is realized. As a result, the efficiency of the Doherty power amplifier is greatly improved under a high linearity condition. The inductance value of the novel switching resonant structure decides the working frequency thereof; the inductance value in the switching resonant structure is reasonably calculated, and meanwhile, the implementation of a zero-current switch of the class E power amplifier is considered to guarantee the implementation of high efficiency performance of the power amplifier within a working frequency range.

Description

technical field [0001] The invention belongs to the field of microwave circuit design, in particular to a method for realizing a high-efficiency Doherty power amplifier based on a switch resonance structure. Background technique [0002] With the stringent requirements of efficiency and linearity in wireless modulation systems, the efficiency of power amplifiers is becoming more and more important. Under the condition of ensuring the linearity of the power amplifier, obtaining high efficiency has become the key technology for the development of the power amplifier. [0003] At present, some traditional methods to improve power amplifier efficiency, such as Dynamic Bias Control, LINC (Linear Amplification with Nonlinear Components) transmitter, Envelope Elimination and Restoration (EER) and Polar Transmitter, usually require the use of external Circuit and signal processing, which will lead to increased design complexity and cost, and also lead to serious problems such as am...

AI Technical Summary

Problems solved by technology

In this technology, the auxiliary power amplifier adopts Class E power amplifier, and the efficiency is greatly improved. However, the proposed structure mainly works at the fundamental frequency, and the harmonic suppression is weak, and the higher linearization requirements of the Doherty power amplifier cannot be guaranteed.

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