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Low-power consumption level multi-reference voltage monoclinic analog-digital conversion method and converter

A reference voltage, multi-reference technology, used in analog-to-digital converters, TVs, electrical components, etc., can solve the problem of increasing power consumption, and achieve the effect of speeding up the conversion rate, low speed requirements, and reduced power consumption

Active Publication Date: 2014-08-13
TIANJIN UNIV
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Problems solved by technology

But requires multiple ramp generators and increases power consumption a lot

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  • Low-power consumption level multi-reference voltage monoclinic analog-digital conversion method and converter

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Embodiment Construction

[0019] The invention improves the multi-slope ADC, and proposes a structure of single slope and multiple reference voltages. It can greatly speed up the conversion rate of the single-slope ADC, and at the same time has a simple structure and low power consumption.

[0020] The present invention adopts the structure of single slope and multiple reference voltages to improve the single slope 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) for each column. Its waveform is as image 3 As shown, the range of the slope voltage is 1 / k of the quantization range (Vref=Vrefp-Vrefn), and each reference voltage divides the quantization range into k finer quantization intervals. Each column circuit includes a comparator, a multi-way selection switch, a logic circuit and a storage circuit. attached figure 2 For the sake of simplicity, only two columns of circ...

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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 column-level multi-reference voltage single-slope analog-to-digital conversion method and converter. technical background [0002] 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 signal into digital signal. There are three types of ADCs currently used in CMOS image sensors: pixel-level ADCs, column-level ADCs, and chip-level ADCs. Compared with chip-level ADC, column-level ADC has lower requirements on ADC speed, which reduces the design difficulty; compared with pixel-level ADC, it improves the fill factor, thereby improving the photoelectric conversion efficiency of image sensors, so column-level ADC has been obtained widely used. Howeve...

Claims

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Application Information

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Patent Type & Authority Applications(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
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