Signal processing circuit of analog image for CMOS image sensor

A technology of signal processing circuit and simulating image, applied in image communication, television, electrical components and other directions, can solve the problems of shrinking volume, complicated circuit, increasing chip size, etc., and achieve the effect of reducing cost, reducing volume and simplifying circuit structure

Active Publication Date: 2007-07-04
BYD SEMICON CO LTD
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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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  • Signal processing circuit of analog image for CMOS image sensor

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[0033] The present invention may also have other implementation manners, for example, the input stage capacitor may not include the second positive input stage switched capacitor array C3 and the second negative input stage switched capacitor array C2. This embodiment implements color gain adjustment and exposure gain adjustment by using the same circuit, and simultaneously eliminates the function of dynamic noise and fixed noise FPN.

[0034] Fig. 2 is the schematic diagram that the preferred embodiment of the present invention is connected with other circuits, as can be seen from the figure, the output end of the differential operational amplifier A1 is connected to the analog-to-digital converter ADC, and the digital image processing ISP (image signalprocess) outputs color according to the automatic adjustment function Gain signal b, exposure gain signal g, and color gain signal b are respectively used to adjust the capacitance values ​​of the first positive input stage swit...

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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 (ie Complementary Metal Oxide Semiconductor) image sensor, in particular to a circuit for analog image signal processing in the CMOS image sensor. 【Background technique】 [0002] With the continuous improvement of CMOS technology 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. Compared with CCD image sensor, CMOS image sensor has 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 in military reconnaissance, satellites and other aspects. [0003] In order to facilitate the digital image processing at the back end, there is usually an A / D converter in the CMOS image sensor chip to convert ...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04N5/14H04N5/335
Inventor 胡文阁
Owner BYD SEMICON CO LTD
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