High-efficiency broadband ordered harmonic matching structure and high-efficiency broadband ordered harmonic control method

Abstract

The invention provides a high-efficiency broadband ordered harmonic matching structure and a high-efficiency broadband ordered harmonic control method. The high-efficiency broadband ordered harmonic matching structure comprises a harmonic control circuit and a fundamental wave matching circuit. An output signal of a power amplifier is loaded to a load end through the harmonic control circuit and the fundamental wave matching circuit. The harmonic control circuit comprises N cross-shaped matching structures. Each cross-shaped matching structure forms a lambda/4 microstrip line and is connected in series orderly, until an output end of an Nth cross-shaped matching structure is connected with an input end of the fundamental wave matching circuit. An output end of the fundamental wave matching circuit is connected with the load end. Compared with the prior art, the high-efficiency broadband ordered harmonic matching structure provided by the invention has the advantages that an existing control structure for the harmonic of center frequency is expanded to control for the harmonic of different frequency points, the bandwidth is expanded under the condition of keeping high efficiency of a power amplifier, and the integrated bandwidth of the amplifier is greatly improved.

Description

technical field [0001] The invention relates to the technical field of radio frequency communication, in particular to an efficient broadband orderly harmonic matching structure and a harmonic control method thereof. 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. Because the power amplifier consumes a lot of DC power, and the frequency band resources for communication equipment are very scarce, efficiency and bandwidth are the first important indicators to be considered in the design of power amplifiers. However, the power amplifiers in the prior art ha...

AI Technical Summary

Problems solved by technology

The advantage of Class B amplifiers is high efficiency, but the disadvantage is that it will produce crossover distortion

Class A and B amplifiers effectively solve the crossover distortion problem of Class B amplifiers, and their efficiency is higher than that of Class A amplifiers, but they cannot widen the bandwidth.

The theoretical efficiency of class F is 100%, but it is very difficult to control all high-order harmonics and the bandwidth is very narrow, so it cannot be widely used. How to further expand the bandwidth while ensuring the high efficiency of class F power amplifiers is an urgent problem to be solved. question

[0004] In prior art Class F power amplifier matching, only the center frequency is optimally matched, that is, usually only single-frequency point matching is performed on the original Smith map, and then the entire matching circuit is adjusted to achieve broadband efficiency. This adjustment process does not Theoretical support, usually adjusted according to experience, and then verified by simulation or actual measurement, the design is relatively difficult

According to the classic transmission line theory, when the operating frequency deviates from the center frequency, the corresponding output impedance will also deviate from the optimal value, resulting in attenuation of the performance of the amplifier, which will have a great impact on the efficiency of the power amplifier. Therefore, those of ordinary skill in the art generally believe that the prior art EF class power amplifier is not suitable for broadband, but can only be designed for narrowband

Images