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A TIADC System Error Estimation and Compensation Method Based on Sine Fitting

A technique of sine fitting and systematic error, applied in physical parameter compensation/prevention, analog/digital conversion calibration/test, code conversion, etc., to achieve good effectiveness

Active Publication Date: 2021-07-27
SOUTHEAST UNIV
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Problems solved by technology

However, this type of method is not as accurate as the digital method in terms of error compensation accuracy, and is greatly affected by temperature and process changes

Method used

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  • A TIADC System Error Estimation and Compensation Method Based on Sine Fitting
  • A TIADC System Error Estimation and Compensation Method Based on Sine Fitting
  • A TIADC System Error Estimation and Compensation Method Based on Sine Fitting

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Embodiment Construction

[0027] Embodiments of the present invention will be described below in conjunction with the accompanying drawings.

[0028] Such as figure 2 As shown, the present invention has designed a kind of TIADC system error estimation and compensation method based on sinusoidal fitting, and the system based on this method is as figure 1 As shown, the principle is to estimate the channel error in the TIADC system based on the sinusoidal fitting method, and to compensate the bandwidth mismatch by designing a fractional delay filter of the Farrow structure, thereby improving the overall performance of the TIADC system. This method specifically comprises the following steps:

[0029] Step 1. For gain mismatch g i and offset mismatch os i Estimation, including: input a low-frequency sinusoidal signal of known frequency to TIADC, obtain the sampling output y[n] of TIADC, and solve the estimated values ​​of the three parameters A, B, and C in the sinusoidal signal according to the sinusoi...

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Abstract

The invention discloses a TIADC system error estimation and compensation method based on sinusoidal fitting, comprising: inputting a low-frequency sinusoidal signal of a known frequency to the TIADC, solving the estimated values ​​of three parameters and calculating the amplitude sum of the sinusoidal output of each channel Offset; get the gain mismatch and offset mismatch and calculation of the remaining channels to complete the compensation; input a high-frequency sinusoidal signal of known frequency to TIADC, and calculate the sampling time mismatch and bandwidth mismatch of each channel after obtaining the three parameters The amplitude value and phase value of the sinusoidal output matched; the phase value caused by channel bandwidth and bandwidth mismatch and the phase value caused by sampling time mismatch are estimated; the adjustable delay line and fractional delay filter are used for phase adjustment respectively, so as to Compensate for phase errors caused by sampling instant mismatch and bandwidth mismatch. The invention can realize accurate estimation and compensation for the errors caused by various mismatches existing in the TIADC, and is not limited by the number of channels at the same time, and has good effectiveness, universality and practicability.

Description

technical field [0001] The invention relates to a sine fitting-based TIADC system error estimation and compensation method, belonging to the technical field of high-speed analog-to-digital converters. Background technique [0002] With the advancement of technologies such as electronic information, the application fields of ADCs continue to expand, and the system's requirements for ADCs continue to increase, so analog-to-digital converters have become the key to improving the speed of communication systems. For high-speed digital signal applications, the conversion rate of the ADC is also limited, and it is increasingly difficult for single-channel ADCs to meet the requirements of high-speed systems. Therefore, how to use the existing ADC to realize a high-speed and high-precision data acquisition system is of great significance. [0003] Multi-channel ADC parallel working sampling is an effective method to achieve higher sampling rate and high-precision ADC, that is, to us...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H03M1/10H03M1/06
CPCH03M1/0604H03M1/1014
Inventor 吴建辉李鑫黄成李红闵嘉炜
Owner SOUTHEAST UNIV
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