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Analog read circuit and image sensing module

A technology for reading circuits and pixel circuits, applied in electrical analog memory, televisions, electrical components, etc., can solve the problems of large circuit area and power consumption, mismatch, large occupation of column analog-to-digital converters, etc., and reduce the circuit area And power consumption, short operation time, and the effect of improving the system signal-to-noise ratio

Active Publication Date: 2018-05-22
SHENZHEN GOODIX TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] However, compared with the global ADC, the column ADC has the disadvantages of occupying a larger circuit area and power consumption
In addition, different AD converters corresponding to different pixel columns may also have the problem of mismatch (Mismatch). The mismatch of AD converters means that different AD converters convert the same analog value into different digital values.

Method used

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  • Analog read circuit and image sensing module
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  • Analog read circuit and image sensing module

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Embodiment Construction

[0036] In order to make the purpose, technical solution and advantages of the present application clearer, the present application will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the present application, and are not intended to limit the present application.

[0037] figure 1It is a schematic diagram of an image sensing module 10 according to Embodiment 1 of the present application. The image sensor module 10 includes a plurality of pixel circuits PX, an analog readout circuit (Readout) 12 and an analog-to-digital converter (Analog-to-Digital Converter, ADC) 14 . A plurality of pixel circuits PX are arranged in an array and coupled to the analog readout circuit 12, and the analog readout circuit 12 reads the analog pixel value V corresponding to each pixel circuit PX at different times. PX , to generate an analog reading resul...

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Abstract

The present invention provides an analog read circuit coupled to a pixel output terminal of a pixel circuit, the analog read circuit including an amplifier and a sensing multiple sampling unit; wherein, in the selection range, the sensing multiple sampling unit performs a plurality of sensing sampling operations on the pixel values of the pixel output terminal respectively at a plurality of sensing sampling times to generate a plurality of sensing sampling results; wherein, in the output range, the sensing multiple sampling unit performs a sensing averaging operation on the plurality of sampling results, the amplifier outputs a read result that is related to a sensing average of the plurality of sensing sampling results.

Description

technical field [0001] The present application relates to an analog reading circuit and an image sensing module, in particular to an analog reading circuit and an image sensing module that can improve the signal-to-noise ratio and reduce circuit area and power consumption. Background technique [0002] Correlated multiple sampling (Correlated Multiple Sampling, CMS) technology has the advantage of improving the signal-to-noise ratio, and it has been applied in the column analog-to-digital converter (Column Analog-to-Digital Converter, Column ADC) in the image sensor module, where the column The analog-to-digital converter only needs to perform analog-to-digital conversion of multiple analog pixel values ​​for a certain column of pixels in the pixel array. In the prior art, the ADC using correlated multiple sampling is performed in the digital domain (Digital Domain), which requires a higher sampling rate (Sampling Rate). Also, because the A / D converter adopting correlated m...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04N5/378H04N5/357
CPCH04N25/616H04N25/78G11C27/026H04N25/618H04N25/75
Inventor 曾千鉴
Owner SHENZHEN GOODIX TECH CO LTD