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Code density high-order harmonic calibration system based on FFT extraction

A correction system and code density technology, applied in the field of high-order harmonic correction system, can solve problems such as high-order harmonic distortion

Active Publication Date: 2017-07-07
NO 24 RES INST OF CETC
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Problems solved by technology

[0004] In order to solve the problem of high-order harmonic distortion in the analog-to-digital converter, the present invention provides a code density high-order harmonic correction system based on the correction information extracted by FFT, which can effectively suppress the corresponding high-order harmonics in the high-frequency broadband High-order harmonics, which can improve the frequency response of the entire information system

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  • Code density high-order harmonic calibration system based on FFT extraction
  • Code density high-order harmonic calibration system based on FFT extraction
  • Code density high-order harmonic calibration system based on FFT extraction

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[0023] In order to make the technical means, creative features, goals and effects achieved by the present invention easy to understand, the present invention will be further described below in conjunction with specific illustrations.

[0024] In the description of the present invention, it should be noted that unless otherwise specified and limited, the terms "installation", "connection" and "connection" should be understood in a broad sense, for example, it can be a fixed connection or a detachable connection. Connected, or integrally connected; it may be mechanically connected or electrically connected; it may be directly connected or indirectly connected through an intermediary, and it may be the internal communication of two components. Those of ordinary skill in the art can understand the specific meanings of the above terms in the present invention in specific situations.

[0025] Please refer to figure 1 As shown, it is a schematic block diagram of a code density high-...

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Abstract

The invention discloses a code density high-order harmonic calibration system based on FFT extraction. The system comprises an analog to digital converter, an operation unit for extracting high-order harmonic distortion information, modeling unit for extracting and modeling code density information of a calibration signal, and a lookup table. The analog to digital converter is used for converting an input analog signal into a digital signal. The operation unit is used for obtaining a time domain signal required for calibration of three-order distortion. The modeling unit is used for modeling the code density information of the calibration signal, thereby obtaining code density calibration configuration information. The code density calibration configuration information is stored in the lookup table. The lookup table is used for carrying out data calibration processing on the digital signal according to the code density calibration configuration information stored in the lookup table. According to the code density high-order harmonic calibration system based on FFT extraction, corresponding high-order harmonic can be effectively suppressed in a high bandwidth, so the frequency response of a whole information system can be improved.

Description

technical field [0001] The invention relates to a high-order harmonic correction system, in particular to a code density high-order harmonic correction system based on FFT extraction. Background technique [0002] As a bridge between analog signals and digital signals, analog-to-digital converters play an increasingly important role in modern communication systems. Due to the high-precision and wide-band requirements of communication systems, analog-to-digital converters are often required to work at high frequencies Under the input condition, but when the input frequency enters the high frequency condition, the physical characteristics of the chip itself will cause the nonlinear characteristics of the front end of the chip to be very significant, and will introduce significant second and third order distortion, which is in the conversion spectrum of the analog-to-digital converter. The above shows significant second and third order harmonics. In the traditional way, in ord...

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Application Information

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IPC IPC(8): H03M1/10
CPCH03M1/1019
Inventor 邓民明刘涛王旭
Owner NO 24 RES INST OF CETC
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