Parallel distortion signal generator and power amplifier applied circuit thereof

Abstract

The invention relates to a parallel distorted signal generator as well as predistortion linear compensatory power amplifier, front feed single-ring linear compensatory power amplifier and front feed single ring-predistortion mixed linear compensatory power amplifier, all of them using it. It includes reversed phase distributor, linear branch composed of linear state amplifier A1 and transmission delay line L1, nonlinear branch composed of nonlinear state amplifier A2 and transmission delay line L2 and inphase adder, can generate nonlinear distorted signal to eliminate nonlinear distortion of the power amplifier and then linearizes the power amplifier. It is simple, convenient to debug; and reduces the circuit cost by about 40%, its structure is simple and its method is skillful and novel, its cost is low and its development technique has low risk.

Description

Technical field [0001] The invention belongs to the field of wireless communication and broadcasting, and particularly relates to a parallel distortion signal generator and its application circuit in the linearization circuit of a radio frequency power amplifier: feedforward single loop linear compensation power amplifier, predistortion linear compensation power Amplifier, and feedforward single loop-predistortion hybrid linear compensation power amplifier. Background technique [0002] With the rapid development of the communications industry, the communications system and corresponding equipment are being updated faster and faster. In just more than ten years, communication has gone from the first generation of analog communication to the era of digital communication, from the original voice communication to the current Internet, e-mail, multimedia and other services. According to statistics, by 2003, there were 700 million Internet users and 830 million wireless users worldwid...

AI Technical Summary

Problems solved by technology

The main problem is that, on the one hand, the poor match between the nonlinearity and the nonlinear characteristics of the main amplifier affects the compensation effect; The instability of the circuit and the difficulty of debugging

In actual circuits, people generally use the delay line method to achieve the phase balance between the main and auxiliary circuits. Since the delay line often changes with the change of frequency and temperature, and the delay line cannot be adjusted adaptively, it is necessary to achieve this phase balance, it is necessary to constantly tune the two delay line circuits very carefully

In addition, due to the use of two loops, a large number of devices are required, which increases the cost of the system

Therefore, the disadvantages of such an amplifier circuit are: the system has high production costs, difficulty in circuit design and debugging, and great risk in research and development.

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