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A method for extracting sampling time mismatch error between channels of tiadc system

A technology of sampling time and mismatch error, applied in the direction of analog/digital conversion, code conversion, electrical components, etc., can solve the problems of time mismatch, etc., and achieve the effect of fast error extraction speed, good effectiveness, simple and clear structure

Active Publication Date: 2022-03-11
SOUTHEAST UNIV
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  • Claims
  • Application Information

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Problems solved by technology

[0006] The technical problem to be solved by the present invention is to overcome the deficiencies of the prior art, provide a method for extracting the sampling time mismatch error between the channels of the TIADC system, solve the influence caused by the mismatching problem of the sampling time between the channels in the TIADC system, and realize Suppression of sampling instant mismatch effects between channels

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  • A method for extracting sampling time mismatch error between channels of tiadc system
  • A method for extracting sampling time mismatch error between channels of tiadc system
  • A method for extracting sampling time mismatch error between channels of tiadc system

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Embodiment Construction

[0031] Embodiments of the present invention will be described below in conjunction with the accompanying drawings.

[0032] Such as figure 1 and 2 Shown, the present invention has designed a kind of TIADC system inter-channel sampling time mismatch error extraction method, the method of the present invention is based on the TIADC system of carrier modulation, comprises sub-channel ADC 0 、ADC 1 、ADC M-1 , the method specifically includes the following steps:

[0033] Step 1. First, input a test single-tone sinusoidal signal of known frequency to the TIADC system with sampling time mismatch, assuming that the test single-tone sinusoidal signal is:

[0034]

[0035] Among them, ω in and Respectively represent the frequency and initial phase of the test single-tone sinusoidal signal; t represents the time.

[0036] Step 2. After the test single-tone sinusoidal signal is sampled by each channel of the TIADC with sampling time mismatch, the digital output signal of the su...

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Abstract

The invention discloses a sampling time mismatch error extraction method between channels of a TIADC system. Each channel is sampled to obtain the digital output signal of each channel; the digital output signal of each channel is used to modulate the same-frequency carrier signal in the digital domain to obtain the modulated digital signal of each channel; the modulated digital signal of each channel is obtained separately Average operation to obtain the average value of the digital signal of each channel; according to the average value of the digital signal of each channel, use the inverse trigonometric function to estimate the sampling time mismatch value of each channel, and subtract the obtained digital output signal of each channel to obtain the value of each channel Calibrated digital output signal. The invention can accurately extract the sampling time mismatch value existing in the TIADC system, significantly improves the SNR and SFDR, has fast estimation speed, and has good validity, universality and practicability.

Description

technical field [0001] The invention relates to a method for extracting sampling time mismatch errors between channels of a TIADC system, and belongs 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...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H03M1/12H03M1/10
CPCH03M1/1014H03M1/1245
Inventor 吴建辉李鑫黄成李红
Owner SOUTHEAST UNIV