Distortion compensation circuit, distortion compensation signal generating method, and power amplifier

A technology of distortion compensation and power amplification, applied in amplifiers, improved amplifiers to reduce nonlinear distortion, parts of amplifiers, etc., can solve impractical problems

Inactive Publication Date: 2004-12-22
KOKUSA ELECTRIC CO LTD
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  • Abstract
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Problems solved by technology

[0005] As a method of updating the table, as described in the above-mentioned Non-Patent Document 1, the address of the table is equal to one scale, and in the method of obtaining the values ​​in all addresses by the perturbation method, it takes a considerable time to update, so , is extremely impractical

Method used

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  • Distortion compensation circuit, distortion compensation signal generating method, and power amplifier
  • Distortion compensation circuit, distortion compensation signal generating method, and power amplifier
  • Distortion compensation circuit, distortion compensation signal generating method, and power amplifier

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Embodiment Construction

[0024] Hereinafter, embodiments of the present invention will be described.

[0025] In the embodiment of the present invention, as the distortion compensation signal, two types of compensation signals corresponding to the input signal level are generated and used. One compensation signal is a compensation signal for automatic correction in which the amplitude level of the input signal corresponds to a relatively large level, and the other compensation signal is a compensation signal for fixed correction in which the amplitude level of the input signal corresponds to a smaller level. Signal.

[0026] First, the compensation signal for automatic correction will be described.

[0027] First, the principle for obtaining a distortion value generated by a power amplifier to generate a distortion compensation signal of an inverse characteristic will be described. Generally, the characteristics of the power amplifier circuit can be represented by the expanded formula shown in formula...

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Abstract

A distortion compensating circuit for a power amplifier attains raised compensating accuracy with shorter convergence time by accurately and quickly generating a distortion compensation signal for pre-distortion. An error signal representing the difference between the input and output signals of the power amplifier is generated. From the error signal and the input signal, the coefficients of the third-order intermodulation distortion, fifth-order intermodulation distortion and seventh-order intermodulation distortion are calculated. According to these coefficients, a distortion compensating signal which is characteristically opposite in phase and gain to the intermodulation distortions is generated.

Description

technical field [0001] The present invention relates to a nonlinear distortion compensation technique for reducing a nonlinear distortion component output from a transmitting device that transmits radio waves amplified by a power amplifier. Background technique [0002] As an example of the existing nonlinear distortion compensation technology, especially the technology of pre-distortion compensation method, for example, there are disclosed in Ying Qing Xue Ji Bao Vol.24, No.79, BCS2000-92, "Adaptive pre-distortion compensation The technology described in "Distortion Compensated Power Amplifier" (Non-Patent Document 1). here, Figure 5 shows an example of a block configuration of a transmitting device including a conventional power amplifier. Hereinafter, the Figure 5 Describe the technique. [0003] exist Figure 5 Among them, the signal to be transmitted, that is, the input signal, passes through the distributor 51, the delay element 52, the phase adjuster 53, the gain a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H03F1/32
CPCH03F1/3247H03F1/3282
Inventor 广濑伸郎塚本信夫郁丸史人佐野诚一
Owner KOKUSA ELECTRIC CO LTD
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