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Low-power column-level multi-reference voltage single-slope analog-to-digital conversion method and converter

A reference voltage and multi-reference technology, applied in the direction of analog-to-digital converters, televisions, electrical components, etc., can solve the problem of increased power consumption and achieve the effect of accelerating conversion rate, low speed requirements, and increasing power consumption

Active Publication Date: 2017-02-15
TIANJIN UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

But requires multiple ramp generators and increases power consumption a lot

Method used

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  • Low-power column-level multi-reference voltage single-slope analog-to-digital conversion method and converter
  • Low-power column-level multi-reference voltage single-slope analog-to-digital conversion method and converter
  • Low-power column-level multi-reference voltage single-slope analog-to-digital conversion method and converter

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Embodiment Construction

[0020] The invention improves the multi-slope ADC, and proposes a structure of a single slope and multiple reference voltages. It can greatly speed up the conversion rate of the monoslope ADC, and at the same time has a simple structure and low power consumption.

[0021] The present invention adopts the structure of a single slope and multiple reference voltages to improve the monoslope ADC. The structure is as follows: figure 2 shown. The ramp and reference voltage generator generates a ramp voltage Vramp and k reference voltages VrefK (K=1, 2, 3, . . . , k), which are provided to each column for use. Its waveform is image 3 As shown, the range of the ramp voltage is 1 / k of the quantization range (Vref=Vrefp−Vrefn), and each reference voltage equally divides the quantization range into k fine quantization intervals. Each column of circuits includes comparators, multiplexers, logic circuits, and storage circuits. attached figure 2 For the sake of brevity, only two col...

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Abstract

The invention relates to the field of digital-analog hybrid integrated circuit design, aims to increase the conversion rate of a monoclinic ADC and provides the analog-digital converter which is simple in structure and low in power consumption. According to the adopted technical scheme of a low-power consumption level multi-reference voltage monoclinic analog-digital conversion method and a converter, the converter is composed of a ramp generator, a counter, comparators, multiplexer switches and a register; the ramp generator generates a ramp voltage Vramp and k reference voltages VrefK, wherein K=1, 2, 3..., K; each of the k reference voltages VrefK is supplied to the corresponding comparator through one of the corresponding multiplexer switches; the ramp voltage Vramp is supplied to each comparator. The low-power consumption level multi-reference voltage monoclinic analog-digital conversion method and the converter are mainly applied to digital-analog hybrid integrated circuit design.

Description

technical field [0001] The invention relates to the field of digital-analog hybrid integrated circuit design, in particular to a low-power-consumption column-level multi-reference voltage single-slope analog-to-digital conversion method and a converter. [0002] technical background [0003] CMOS image sensors have the advantages of high integration, low power consumption and low cost, and are widely used in the field of image acquisition. ADC is an important part of CMOS image sensor, which realizes the function of converting analog signals into digital signals. There are three types of ADCs currently used in CMOS image sensors: pixel-level ADCs, column-level ADCs, and chip-level ADCs. Compared with the chip-level ADC, the column-level ADC has lower requirements on the ADC speed, which reduces the design difficulty; compared with the pixel-level ADC, the fill factor is improved, thereby improving the photoelectric conversion efficiency of the image sensor. widely used. Bu...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H03M1/12H04N5/3745
Inventor 徐江涛吕涛姚素英史再峰高静聂凯明高志远
Owner TIANJIN UNIV