Signal processing circuit of analog image for CMOS image sensor

Abstract

The invention relates to an analogue image signal processing circuit used in CMOS image sensor, wherein it comprises differential amplifier, input capacitor, and output capacitor; the input capacitor comprises the first positive input switch capacitor array and the first passive switch capacitor array; the first positive array inputs analogue image signal; the controller is connected to the color gain control signal end; the output end is connected to the color gain control signal end; the output is coupled to the positive input of differential amplifier; the output is coupled to the passive input of differential amplifier; the output capacitor is connected between the output and input of differential amplifier / the invention uses one circuit to realize at least two control functions, to reduce the volume of CMOS sensor and cost.

Description

【Technical Field】 [0001] The present invention relates to a CMOS (complementary metal oxide semiconductor) image sensor, and more particularly to a circuit for analog image signal processing in the CMOS image sensor. 【Background technique】 [0002] With the continuous improvement of CMOS process and solid-state image sensor technology, CMOS image sensor has developed rapidly. CMOS image sensor technology has replaced CCD sensor technology in the low-end image and video market. CMOS image sensor has more advantages than CCD image sensor. Low power consumption, wide dynamic range, high-speed video, high integration, low cost and other advantages, suitable for miniature digital cameras, portable video phones, computer cameras and other fields, CMOS image sensors can also be used for military reconnaissance, satellites, etc. [0003] In order to facilitate the back-end digital image processing, usually there is an A / D converter in the CMOS image sensor chip to convert the analog imag...

AI Technical Summary

Problems solved by technology

[0007] When the CMOS image sensor in the prior art realizes differential work, and realizes color control, exposure control, black background control, dynamic noise elimination and fixed noise FPN, its processing circuit function is single and the circuit is complicated, so the size of the chip is increased. However, in today's fierce competition in the IC market, on the premise that the imaging effect is not affected, reducing the size and reducing the cost has become the focus of competition among CMOS image sensor design manufacturers

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