High-linearity class-AB power amplifier with broadband pre-distortion and phase compensation

Abstract

The invention discloses a high-linearity class AB power amplifier with broadband predistortion and phase compensation, and the power amplifier comprises three main amplifiers, a first bias circuit, a second bias circuit, a broadband predistortion circuit, a first phase linear compensation circuit and a second phase linear compensation circuit, wherein the third main power amplifier is in series connection with the first and second main power amplifiers, and the input end is in matched connection with the input, the output end is in matched connection with a T-shaped stage, the third main power amplifier, the stage matching part and a feedback circuit form a broadband pre-distortion circuit to compensate nonlinearity and provide constant gain amplitude; the input end of the first main amplifier and the second main amplifier after being connected in parallel is connected with one end of the broadband predistortion circuit, and the output end of the first main amplifier and the second main amplifier after being connected in parallel is connected with a pi-type matching network circuit; the second bias circuit is connected between the base electrodes of the first main amplifier and the second main amplifier. Simulation pre-distortion and phase compensation are achieved by improving the circuit structure, and therefore high linearization is achieved under the condition that the efficiency requirement is met.

Description

technical field [0001] The invention belongs to the field of integrated circuits, in particular to a high linear class AB power amplifier with wideband predistortion and phase compensation. Background technique [0002] With the development and gradual popularization of 5G communication technology, the demand for reliable communication systems with high transmission rate, high throughput and low latency is increasing. Complex modulation (OFDM) and wider signal bandwidth will place more stringent requirements on the power amplifier. At the same time, a higher peak-to-average ratio (PAPR) will make the power amplifier (PA) enter the saturation region faster, which requires high linearity of the power amplifier. Improving the linearity of the power amplifier (PA) is of great help to improve the linearity of the communication system. Therefore, the technology of improving the linearity of the power amplifier has always been the focus and difficulty of research in the academic a...

AI Technical Summary

Problems solved by technology

[0009] In order to solve the deficiencies in the prior art, the present invention provides a highly linear class AB power amplifier with broadband pre-distortion and phase compensation, and realizes analog pre-distortion and phase compensation by improving the circuit structure, so as to meet the efficiency requirements , to achieve high linearization

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