Design method for radio frequency power amplifier broadband matching circuit and smith chart used by design method

Abstract

The invention provides a design method for a radio frequency power amplifier broadband matching circuit and a smith chart used by the method. The design method adopts a new idea in the broadband power amplification design, i.e. a stereoscopic three-dimensional smith chart which is a new tool for broadband design. According to the stereoscopic smith chart, expansion is carried out on the basis of a conventional classical two-dimensional smith chart; frequency coordinates are added; visualization of a great quantity of data in the broadband design process is implemented; the problem of difficulty in diagrammatizing, which is caused by the case that the conventional classical two-dimensional smith chart is displayed on a broadband to generate the overlapping phenomenon, is avoided; simplified calculation and diagrammatizing also can be carried out in the broadband and particularly in a matching network of broadband power amplification design. Display of the stereoscopic three-dimensional smith chart is convenient for a user to integrally grasp the integral effect of the broadband matching network design, enables a conventional broadband complex network to be visualized and enables broadband design to be more convenient and effective. All in all, the stereoscopic smith chart can be effectively applied to the broadband network impedance analysis and the broadband matching network design.

Description

technical field [0001] The invention relates to a design method of a radio frequency power amplifier broadband matching circuit and a used Smith chart, belonging to the technical field of radio frequency communication. Background technique [0002] In the wireless communication environment that is constantly developing at home and abroad, the key indicators of RF power amplifiers are very important in the entire communication system. Even in some cases, it can be said that the performance of the RF power amplifier represents the performance of the entire wireless communication system. [0003] With the continuous emergence of various advanced communication standards, whether it is the requirements for signal bandwidth or various frequency band requirements for base station upgrades, broadband design has become an increasingly urgent problem to be solved. [0004] At the same time, with the development of manufacturing technology and other technologies in the industry, the w...

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Problems solved by technology

[0006] However, the classic Smith chart is a two-dimensional plane chart, which can only reflect the quantitative correspondence between the transmission line impedance or the real part and the imaginary part of its reflection coefficient, and cannot reflect the dynamics of the transmission line impedance changing with frequency. process, that is, it cannot reflect the quantitative correspondence between the real part, the imaginary part, and the frequency of the transmission line impedance. That is to say, the classic Smith chart can only solve binary equations, but cannot solve ternary equations.

[0007] Moreover, when analyzing the impedance of a broadband network, it is usually necessary to make multiple circle diagrams according to different frequencies. These circle diagrams overlap on the same plane, which is confusing and inconvenient to identify, which easily leads to calculation errors.

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