Digital decimation filter, filtering method, and analog-to-digital converter

A decimation filter and decimation filtering technology, applied in the electronic field, can solve problems such as large delay

Pending Publication Date: 2020-10-27
CRM ICBG (WUXI) CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0013] Each level of registers and adder (subtractor) is a big resource consumption, and the delay is relatively large

Method used

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  • Digital decimation filter, filtering method, and analog-to-digital converter
  • Digital decimation filter, filtering method, and analog-to-digital converter
  • Digital decimation filter, filtering method, and analog-to-digital converter

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Embodiment Construction

[0030] In order to make the technical solutions and advantages of the present invention clearer, the embodiments of the present invention will be further described in detail below in conjunction with the accompanying drawings.

[0031] In the description of the present invention, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply that there is a relationship between these entities or operations. Any such actual relationship or sequence. Furthermore, the term "comprises", "comprises" or any other variation thereof is intended to cover a non-exclusive inclusion such that a process, method, article or apparatus comprising a set of elements includes not only those elements, but also includes elements not expressly listed. other elements of or also include elements inherent in such a process, method, article, or device. Without further limitations, an element...

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Abstract

The present invention discloses a digital decimation filter, a filtering method and an analog-to-digital converter, the digital decimation filter comprising: a first integrator for integrating an input signal on the basis of a first sampling clock signal to obtain a first signal; a second integrator which is used for integrating the first signal based on the first sampling clock signal to obtain asecond signal; a first temporary memory which is used for storing the first signal based on the second sampling clock signal to obtain a third signal; a second temporary memory which is used for storing the second signal based on the second sampling clock signal to obtain a fourth signal; and an arithmetic unit which is used for operating the second signal, the third signal and the fourth signalbased on a second sampling clock signal to obtain a fifth signal as the output of the digital decimation filter, wherein the period of the second sampling clock signal is 1/N of the period of the first sampling clock signal, and N is a positive integer. The digital decimation filter has fewer registers while realizing digital decimation filtering.

Description

technical field [0001] The invention relates to the field of electronic technology. More specifically, it relates to a digital decimation filter, a filtering method, and an analog-to-digital converter. Background technique [0002] The Σ-Δ (Delta-Sigma) modulator and digital decimation filter are the key circuit modules to realize a high-precision analog-to-digital converter (ADC) above 16bit. The Σ-Δ modulator relies on the noise suppression (Noise Shaping) technology realized by oversampling and closed-loop negative feedback control to move the quantization noise in the baseband to the high frequency band, while the digital decimation filter filters out the noise in the high frequency band outside the band , while reducing the output frequency bandwidth to the Nyquist sampling frequency of the input signal (2f B ), and finally realize the high-precision analog-to-digital conversion of the input signal. With the increase of the oversampling multiple N, the quantized nois...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H03M1/12
CPCH03M1/1245
Inventor 周盛刘珍利丁东民蔡鹏飞陈方清乃瑜李亚平彭维友
Owner CRM ICBG (WUXI) CO LTD
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