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Dynamic element matching method applied to sigma-delta analog-to-digital converter modulator

A dynamic component matching, analog-to-digital converter technology, applied in analog conversion, electrical components, code conversion and other directions, can solve the problem of single method, can not well suppress harmonic components, etc., to achieve the effect of suppressing harmonic components

Active Publication Date: 2016-02-10
SOUTHEAST UNIV
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Problems solved by technology

However, this method cannot suppress the harmonic components related to the signal very well. The fundamental reason is that the rotation method is single

Method used

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  • Dynamic element matching method applied to sigma-delta analog-to-digital converter modulator
  • Dynamic element matching method applied to sigma-delta analog-to-digital converter modulator
  • Dynamic element matching method applied to sigma-delta analog-to-digital converter modulator

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Embodiment Construction

[0035] The present invention will be further described below in conjunction with the accompanying drawings.

[0036] Such as image 3 Shown is a schematic diagram of the logical operation of weighted average rotation data of four dynamic elements, the four elements are respectively element 0, element 1, element 2, and element 3. The shown ring 1, ring 2, ring 3, ring 4, ring 5, and ring 6 are a way of selecting components of DWA. The initial state is the rotating ring 1, and the initial state time is t 0 , no input signal. Below with t 1 , t 2 , t 3 , t 4 , t 5 , t 6 , t 7 Input the corresponding decimal codes of 2, 1, 3, 2, 4, 0, and 3 at sequential moments to illustrate the selection of components.

[0037] t 1 The time input is 2, at this time element 0 and element 1 are selected in ring 1, at t 2 Before the time comes, a random signal determines the next ring to select the element. In this case, the ring selection method is determined by the pointer signal of t...

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Abstract

The invention discloses a dynamic element matching method applied to a sigma-delta analog-to-digital converter. The method comprises the following steps of subtracting a feedback DAC signal from an input analog signal, passing a loop filter, and lastly outputting a digital signal through a multi-digit inner quantizer; and processing the digital signal output by the multi-digit inner quantizer through a spin data weighted averaging method firstly and then converting by a digital-to-analog converter to be used as the feedback DAC signal. A dynamic element matching logic circuit is used in the spin data weighted averaging method, and a mismatching error between multi-digit feedback digital-to-analog converter elements is reshaped through the dynamic element matching logic circuit. On the basis of a spin data weighted averaging digital calibration method, the method carries out first-order reshaping on the original relatively-fixed current source mismatching or capacitor mismatching and restrains the harmonic quantity related to the signal, so that the signal-to-noise ratio of the sigma-delta analog-to-digital converter modulator is improved.

Description

technical field [0001] The invention relates to a dynamic component matching method for a feedback digital-analog converter applied in a ΣΔ analog-to-digital converter, and belongs to a digital calibration method for a modulator of a ΣΔ analog-to-digital converter. Background technique [0002] ΣΔAnalog-to-Digital Converter (ΣΔAnalog-to-DigitalConverter, hereinafter referred to as ΣΔADC) due to its characteristics of oversampling and noise shaping can achieve the accuracy that general Nyquist ADC cannot achieve. figure 1 It is a structural block diagram of a traditional ΣΔADC modulator. The main modules include a loop filter, an internal quantizer, and a digital-to-analog converter (Digital-to-Analog Converter, hereinafter referred to as DAC). The input analog signal is subtracted from the feedback DAC signal, and after the loop Road filter, and finally get the output through the internal quantizer. It is worth noting that the output accuracy of the ΣΔ ADC modulator is clos...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H03M3/00
Inventor 吴建辉卜亮宇张俊陈超李红黄成张萌
Owner SOUTHEAST UNIV
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