Realization 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, and particularly relates to a method for realizing a high-efficiency Doherty power amplifier based on a switch resonant structure. Background technique [0002] With the strict requirements for efficiency and linearity of wireless modulation systems, the efficiency of power amplifiers becomes more and more important. Under the condition of ensuring the linearity of the power amplifier, obtaining high efficiency has become a key technology in the development of power amplifiers. [0003] At present, some traditional methods to improve the efficiency of power amplifiers, such as Dynamic BiasControl, LINC (Linear Amplification with Nonlinear Components) transmitter, Envelope Elimination and Restoration (EER) and Polar coordinate transmitter (PolarTransmitter), usually requires the use of additional circuits and signal processing, which will lead to increased design complexity and cost, but also lea...

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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