Oversampling type Pipeline SAR-ADC system

An oversampling and patterning technology, applied in signal transmission systems, electrical signal transmission systems, analog-to-digital converters, etc., can solve the problems of low sampling rate and low resolution, achieve resolution improvement, high resolution, and easy promotion applied effect

Active Publication Date: 2018-03-06
四川知微传感技术有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The purpose of the present invention is to solve the problems of low resolution and low sampling rate in traditional analog-to-digital converters, and...

Method used

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  • Oversampling type Pipeline SAR-ADC system
  • Oversampling type Pipeline SAR-ADC system
  • Oversampling type Pipeline SAR-ADC system

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Embodiment 1

[0033] Such as figure 1 and figure 2 As shown, an oversampling type Pipeline SAR-ADC system includes oversampling switches connected in sequence, an analog-to-digital conversion system and a digital expansion system, wherein the analog-to-digital conversion system includes successive approximation analog-to-digital conversion modules and registers, Wherein, the number of successive approximation analog-to-digital conversion modules is N blocks, where N is a positive integer greater than or equal to 2, and N successive approximation analog-to-digital conversion modules are connected in sequence to form N stages. In this embodiment, the order of each successive approximation analog-to-digital conversion module corresponds to the order of input signals in all successive approximation analog-to-digital conversion modules, and the order of input signals of N-order successive approximation analog-to-digital conversion modules is: first An order successive approximation analog-to-d...

Embodiment 2

[0043] This embodiment makes the following further limitations on the basis of Embodiment 1: the successive approximation analog-to-digital conversion module of this embodiment includes a sampling switch, a capacitor array, a comparator, a logic control module, and an output buffer module, wherein the capacitor array With IN, OUT, G, H, L and C 1-N Pin, the logic control module has IN, OUT, CLK, C 1(1-N) and C 2(1-N) pin. In this embodiment, there are two sampling switches and capacitor arrays, and the two sampling switches are sampling switches SAMP 1 and sampling switch SAMP 2 , the sampling switch SAMP 1 and sampling switch SAMP 2 They are respectively connected to the IN input terminals of the two capacitor arrays in one-to-one correspondence, and the input voltage V ip(t) by the sampling switch SAMP 1 input, input voltage V in(t) by the sampling switch SAMP 2 enter. The OUT output terminals of the two capacitor arrays are respectively connected to the non-invert...

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Abstract

The invention discloses an oversampling type Pipeline SAR-ADC system. The system comprises an oversampling switch, an analog to digital conversion system and a digital expansion system which are orderly connected with each other, wherein the analog to digital conversion system comprises successive approximation type analog to digital conversion modules and a register; the number of the successiveapproximation type analog to digital conversion modules is N, and N is a positive integer greater than or equal to 2; and N successive approximation type analog to digital conversion modules are orderly connected to form N orders, and the order of each successive approximation type analog to digital conversion module is corresponding to the sequence of input signals in all successive approximationtype analog to digital conversion modules, and a digital output end of each successive approximation type analog to digital conversion module is connected with an input end of the register. The digital expansion system comprises a digital bit add module and a clock control module; and the digital bit add module comprises a cascade integrator comb filter and a moving average filter connected withthe cascade integrator comb filter. The oversampling type Pipeline SAR-ADC system provided by the invention uses fewer components, is easy to realize and low in cost, and can improve the output rate and resolution when being applied.

Description

technical field [0001] The invention relates to the technical field of integrated circuits, in particular to an oversampling Pipeline SAR-ADC system. Background technique [0002] As a key device for converting analog signals into digital signals, the analog-to-digital converter (ADC) plays a vital role in aerospace and defense, automotive applications, software radio, consumer electronics, video surveillance and image acquisition, radar communication, etc. effect. With the continuous development of modern technology, the requirements for speed and resolution in these fields are constantly increasing, and the requirements for analog-to-digital converters are also increasing. [0003] Traditional analog-to-digital converters often use two structures, Pipeline-ADC and SAR-ADC. Among them, the application of the Pipeline-ADC structure has the following disadvantages: First, the Pipeline-ADC is greatly affected by capacitance mismatch, which leads to Pipeline-ADC The resolutio...

Claims

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Application Information

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IPC IPC(8): H03M1/12H03M1/46
Inventor 李荣宽周骏沈泓翔
Owner 四川知微传感技术有限公司
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