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Sampling moment mismatch calibration method and system, computer equipment and storage medium

A technology of sampling time and calibration method, applied in the direction of analog/digital conversion calibration/test, code conversion, electrical components, etc., can solve the problems of additional reference channel increasing hardware overhead, less resolution of calibration algorithm, affecting calibration accuracy, etc. Reduce overhead, improve calibration accuracy, and avoid the effects of insufficient accuracy

Pending Publication Date: 2022-06-28
SHANGHAI BEILING
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The technical problem to be solved by the present invention is to overcome that the calibration algorithm in the prior art is only applicable to TIADC with fewer channels or only to TIADC with higher resolution, and the additional reference channel introduced increases hardware overhead and affects calibration accuracy to provide a calibration method, system, computer equipment and storage medium for sampling time mismatch

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  • Sampling moment mismatch calibration method and system, computer equipment and storage medium
  • Sampling moment mismatch calibration method and system, computer equipment and storage medium
  • Sampling moment mismatch calibration method and system, computer equipment and storage medium

Examples

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Embodiment 1

[0064] Before describing the specific process of the calibration method for sampling time mismatch in this embodiment, the principle on which the calibration method in this embodiment is based is first introduced:

[0065] Taking the two-channel TIADC including channel 1 and channel 2 as an example, when there is no sampling time mismatch between sub-channels, the time intervals between the sub-channels and adjacent sampling points are equal, so their corresponding correlation functions are also equal. When there is a mismatch of sampling time between channel 2 and channel 1, if channel 2 has a relative ideal position delay ΔT, the distance between any point of channel 1 and the sampling point of channel 2 immediately after it will be greater than that before it. Distance between channel 2 sample points. Based on this, one of the sub-channels can be directly used as a reference channel for calibration without introducing an additional calibration channel, which can not only re...

Embodiment 2

[0107] see Figure 7 As shown, this embodiment provides a calibration system for sampling time mismatch, which is used to calibrate the TIADC sampling time mismatch. It does not need to introduce an additional reference channel, but directly uses one of the sub-channels as a reference channel for calibration , which can not only reduce the overhead of the entire circuit, but also solve the problem of inaccurate calibration caused by insufficient channel resolution.

[0108] The calibration system for sampling time mismatch provided in this embodiment calibrates a time-interleaved multi-channel analog-to-digital converter including N sub-channels, where N is not less than 2. Specifically, including:

[0109] A selection module 1 is used for selecting one of the sub-channels as a reference sub-channel, and the other sub-channels as sub-channels to be calibrated.

[0110] For example, for a four-channel TIADC, channel 1 is selected as the reference sub-channel, and the remainin...

Embodiment 3

[0145] Figure 8 This is a schematic structural diagram of an electronic device according to Embodiment 3 of the present invention. The electronic device includes a memory, a processor, and a computer program stored in the memory and executable on the processor. When the processor executes the program, the method for calibrating the sampling moment mismatch in Embodiment 1 is implemented. Figure 8 The electronic device 30 shown is only an example, and should not impose any limitation on the function and scope of use of the embodiments of the present invention.

[0146] like Figure 8 As shown, the electronic device 30 may take the form of a general-purpose computing device, which may be, for example, a server device. Components of the electronic device 30 may include, but are not limited to, the above-mentioned at least one processor 31 , the above-mentioned at least one memory 32 , and a bus 33 connecting different system components (including the memory 32 and the process...

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Abstract

The invention discloses a sampling time mismatch calibration method and system, electronic equipment and a storage medium, and the method comprises the steps: selecting one sub-channel of a TIADC as a reference sub-channel, and the other sub-channels as to-be-calibrated sub-channels; performing cross-correlation operation on the sampling value of each sub-channel and the sampling value of the next sub-channel of the sub-channel in the continuous sampling process, and calibrating the sampling time of each sub-channel to be calibrated according to the cross-correlation value corresponding to each sub-channel to be calibrated and the cross-correlation value corresponding to the reference sub-channel. And carrying out calibration until the cross-correlation value corresponding to each to-be-calibrated sub-channel is matched with the cross-correlation value corresponding to the reference sub-channel. According to the TIADC, one sub-channel in the TIADC is used as a calibration channel for calibration sampling, so that the overhead of the whole circuit is reduced, and the calibration speed and the calibration precision are improved on the premise of not introducing an additional calibration channel.

Description

technical field [0001] The present invention relates to the technical field of analog-to-digital conversion, and in particular, to a calibration method, system, computer equipment and storage medium for sampling time mismatch. Background technique [0002] In a multi-channel TIADC (Time-Interleaved Analog-to-Digital Converter, time-interleaved analog-to-digital converter), the offset mismatch, gain mismatch, sampling time mismatch, and nonlinear mismatch between sub-channels, etc., Both will seriously affect the dynamic performance of the TIADC. In practical applications, sampling time mismatch calibration is one of the important ways to improve the sampling time mismatch. The sampling time mismatch refers to the mismatch of the sampling time of each sub-channel relative to the ideal position offset. [0003] like Figure 1A and 1B As shown, in a commonly used sampling time mismatch calibration algorithm based on zero-crossing statistics, taking a dual-channel TIADC as an...

Claims

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Application Information

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IPC IPC(8): H03M1/10
CPCH03M1/1009
Inventor 毛祚伟张辉李丹王海军富浩宇张浩松
Owner SHANGHAI BEILING
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