Image sensor and column processing circuit thereof

A column processing and circuit technology, which is applied in the field of column processing circuits and image sensors, can solve problems such as easy distortion of light intensity signals
CN101605201AActive Publication Date: 2009-12-16BRIGATES MICROELECTRONICS KUNSHAN
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Patent Information

Authority / Receiving Office
CN Β· China
Patent Type
Applications(China)
Current Assignee / Owner
BRIGATES MICROELECTRONICS KUNSHAN
Publication Date
2009-12-16

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Abstract

The invention provides an image sensor and a column processing circuit thereof. A column processing unit of the column processing circuit comprises a reference voltage unit, an optical intensity voltage unit and a differential output switch, wherein the reference voltage unit comprises a control switch and an operational amplifier circuit which are sequentially connected in series from an input end to an output end as well as a grounding capacitor with one end being connected between the control switch and a voltage follower; the optical intensity voltage unit comprises a control switch and an operational amplifier circuit which are sequentially connected in series from an input end to an output end as well as a grounding capacitor with one end being connected between the control switch and a voltage follower; one end of the differential output switch is connected between the control switch of the optical intensity voltage unit and the operational amplifier circuit of the reference voltage unit, and the other end is connected between the control switch of the optical intensity voltage unit and the operational amplifier circuit of the optical intensity voltage unit, wherein the operational amplifier circuit is connected in a way of the voltage follower. The invention improves the precision of an optical intensity voltage signal output by the column processing circuit.
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Description

technical field

[0001] The invention relates to the technical field of image information, in particular to a column processing circuit of an image sensor and the image sensor. Background technique

[0002] Such as figure 1 As shown, an existing image sensor includes a pixel array 10, a column processing circuit 20 connected to the pixel array 10, an analog-to-digital converter 30 connected to the column processing circuit 20, and a digital processing circuit connected to the analog-to-digital converter 30 40.

[0003] The pixel array 10 is composed of several pixels (photosensitive units) 15, and the pixels 15 can perceive the light intensity of a dot area. Since the pixel array 10 has a plurality of pixels 15 arranged in rows and columns, and subsequent circuits cannot process such a large amount of data at the same time, the column processing circuit 20 has a plurality of column processing units 25 and multiplex switches (not shown), Each column processing unit 25 is re...

Claims

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