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Low non-linear power amplifier

A technology for power amplifiers and amplifiers, applied in power amplifiers, improving amplifiers to reduce nonlinear distortion, etc., can solve the problems of low power and low efficiency, and achieve the effects of high efficiency, cost reduction, and simple structure

Inactive Publication Date: 2009-03-18
UNIV OF ELECTRONICS SCI & TECH OF CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] These technologies use the intermodulation signal of the main signal itself to cancel itself, so there are inevitably disadvantages of low power and low efficiency.

Method used

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Examples

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Embodiment Construction

[0021] A low nonlinear power amplifier such as image 3 As shown, it includes main power amplifier, distortion signal generator, distortion signal amplifier, first coupler, second coupler, attenuator and phase shifter.

[0022] The radio frequency input signal A is connected to the input terminal of the first coupler, the output terminal of the first coupler is connected to the input terminal of the main power amplifier, and the output terminal of the main power amplifier is connected to the first input terminal of the second coupler; the coupling output terminal of the first coupler is connected to The input terminal of the attenuator, the output terminal of the attenuator is connected to the input terminal of the phase shifter, the output terminal of the phase shifter is connected to the input terminal of the distortion signal generator, the output terminal of the distortion signal generator is connected to the input terminal of the distortion signal amplifier, and the output...

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Abstract

The invention relates to a power amplifier, in particular to a low nonlinear distortion power amplifier. The low nonlinear distortion power amplifier comprises a main power amplifier, a distortion signal generator, a distortion signal amplifier, a first coupling, a second coupling, an attenuator and a phase shifter, wherein the main power amplifier amplifies a radio frequency input signal A, and attenuates and reverses a bypass radio frequency input signal which is coupled simultaneously, a signal which is reversed with a third-order intermodulation distortion signal which is generated by the main power amplifier is generated by the distortion signal generator, the distortion signal which is amplified is coupled with an output signal of the main power amplifier, which enables the third-order intermodulation distortion signal which is generated by the main power amplifier to be counteracted with the distortion signal which is generated by the distortion signal amplifier, and has equiamplitude and is reversed with the third-order intermodulation distortion signal which is generated by the main power amplifier, and finally an ideal radio frequency power amplifying signal is obtained. The invention has the advantages of excellent performance, high efficiency, simple structure and low cost, and can be used in various systems which need to use linearized power amplifiers.

Description

technical field [0001] The present invention relates to a power amplifier, and in particular to a power amplifier for reducing or substantially eliminating non-linear distortion produced by the amplifier. Background technique [0002] The basic amplifier exhibits nonlinearity when amplifying high-power signals: if there are two similar frequency W1 and W2 signals, passing through the amplifier, a new combined frequency will be generated, generally expressed as mW1+nW2 (m, n are natural numbers), The frequency components closest to W1 and W2 are 2W1-w2 and 2W2-W1 (that is, the third-order intermodulation distortion signal). Since these two frequency components are the most important source of nonlinear distortion, because they are the closest to the frequency of the signal, It is difficult to filter out in the passband of the amplifier, so the degree of nonlinear distortion of the amplifier is measured by the ratio of their amplitude to the amplitude of the fundamental wave. ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H03F1/32H03F3/20
Inventor 唐伟梁刘永
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA
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