Method for enhancing linearity and efficiency of radio-frequency power amplifier

Abstract

The invention relates to the field of radio-frequency power amplifiers, in particular to a method for enhancing linearity and efficiency of a radio-frequency power amplifier, which is realized in a way that: a capacitor is connected to the output end of the radio-frequency power amplifier, and the other end of the capacitor is connected to the ground. As the output end of the radio-frequency power amplifier is connected with the capacitor which is connected with the ground in parallel, the radio-frequency power amplifier is in the Class-F operating state. The capacitor can reduce the even harmonic impedance of the output end of the radio-frequency power amplifier and enhance the odd harmonic impedance; and the change of the harmonic impedance can affect the amplitude-amplitude distortion and the amplitude-phase distortion of the radio-frequency power amplifier as well as the voltage waveform and the current waveform of the output signal, thereby enhancing the linearity and the efficiency of the radio-frequency power amplifier. The method can have the same effect as an LC harmonic oscillation network, eliminates the influence on the efficiency of the radio-frequency power amplifier due to low inductance Q value in the LC harmonic oscillation network, and has the advantages of simple and easy implementation and low cost.

Description

technical field [0001] The invention relates to the technical field of radio frequency power amplifiers, in particular to a method for improving the linearity and efficiency of the radio frequency power amplifier at the periphery of the radio frequency power amplifier. Background technique [0002] In the process of wireless transmission, the attenuation of the signal is very fast, and this attenuation will affect the transmission distance of the signal. In order to achieve a longer distance signal transmission, the signal usually needs to be amplified by a radio frequency power amplifier before being transmitted. [0003] In the wireless transmission system, there are two main requirements for the RF power amplifier: First, in order to avoid the obvious distortion of the signal after being amplified by the RF power amplifier, and to avoid the obvious interference of the amplified signal to the adjacent channel, the RF power amplifier The linearity of the RF power amplifier ...

AI Technical Summary

Problems solved by technology

This method of improving the linearity and efficiency of the RF power amplifier requires L1, C1, L2, and C2 in the resonant network to resonate at the second-order and fourth-order harmonic frequencies respectively, so the accuracy of the inductance and capacitance values ​​is very high, and because The resonant network is located directly at the output of the RF power amplifier, and the limited Q value of the resonant network directly affects the efficiency of the RF power amplifier

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