Design method for reverse class-F power amplifier based on 3/4 spiral virtual ground structure

Abstract

A design method for a reverse class-F power amplifier based on 3/4 spiral virtual ground structure comprises the steps as follows: confirming the work frequency of the power amplifier and obtaining the harmonic frequency of a harmonic control circuit; changing the dimension of the 3/4 spiral structure and designing corresponding harmonic control circuit according to the needed harmonic frequency in the design; inserting the harmonic control circuit into the output end of a power amplifier tube and designing the input-output matching circuit of a power amplifier circuit; and designing the input-output parameters of the power amplifier through measurement, and adjusting the length of a magic line to reach the maximum work efficiency. The amplifier designed by adopting the method comprises an input matching circuit, a power amplifier circuit, a harmonic control circuit and an output matching circuit which are connected onto a microstrip line in sequence; the harmonic control circuit comprises a 3/4 spiral virtual ground structure arranged below the microstrip line, and the virtual ground structure is formed by a complete spiral virtual ground structure cut by 1/4; and the 3/4 spiral virtual ground structure comprises two spiral structure parts connected with each other and in axial symmetry along the microstrip line.

Description

technical field [0001] The invention is a method for designing an inverse class-F power amplifier, in particular to a design of a high-efficiency inverse-class-F power amplifier based on a 3 / 4 Spiral Defected Ground Structure. Background technique [0002] The rapid development of wireless communication technology has put forward higher requirements for the performance indicators of the communication system. As an important part of the wireless communication transmission system, the power amplifier is also the most difficult and expensive part to realize. Indicators such as data transmission rate, coverage, spectrum utilization, and out-of-band spectrum spurs have a great impact. [0003] With the application of modern wireless communication networks (WCDMA, WLAN, WiMAX, etc.), high-speed wireless data transmission increases the peak-to-average ratio of the signal, which requires that the power amplifier must fall back to the linear region to achieve the purpose of improving...

AI Technical Summary

Problems solved by technology

This method uses the unique filtering characteristics of the microstrip line inserted into the 3 / 4 spiral virtual ground structure to design the harmonic control circuit. This harmonic control circuit solves the problem of low Q value and low operating frequency of the traditional lumped component harmonic control circuit. disadvantages, and avoid the disadvantages of large area and complex design of the traditional microstrip harmonic control circuit. The inverse class F power amplifier designed with this harmonic control circuit has the advantages of small area, high work efficiency, low cost and simple design.

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