cmos image sensor

Abstract

A CMOS image sensor and a video camera and a digital camera using the same, the sensor includes: a pixel signal generation module, which is used to generate pixel signals of different modes based on a timing control signal; a pixel signal acquisition module, which is used to collect and store different modes in a pipeline The pixel signal of the correlation double sampling is used for pixel signals of different modes; the pixel signal processing module is used for performing multi-column sharing processing on the pixel signal of correlation double sampling to obtain a digital code. Because the pixel signal generating module of the present invention can obtain pixel signals of different modes by adjusting the timing control signal of the pixel signal controller, the resolution and frame rate of the CMOS image sensor of the present invention are adjustable. The pixel signal sampling module and the pixel signal processing module can process pixel signals shared by multiple columns, so the circuit structure can process multi-column pixel signals in a compact and high-speed manner, reduce the chip area, effectively reduce the area of ​​the analog readout circuit, and make the layout easier to implement.

Description

technical field [0001] The invention belongs to the technical field of integrated circuits, and more specifically relates to a CMOS image sensor. Background technique [0002] There is a compromise between the imaging frame rate and imaging resolution of a CMOS (Complementary Metal Oxide Semiconductor) image sensor. Usually, once a CMOS image sensor is produced, its highest imaging frame rate and maximum resolution are determined and cannot be adjusted. In addition, high-speed CMOS image sensors mostly adopt a column-parallel readout structure, each column is equipped with a readout circuit, so the area of ​​the readout circuit is relatively large, and at the same time, the layout of the column readout circuit is implemented in a narrow strip space (usually micron level). bring difficulty. Contents of the invention [0003] Based on the above problems, the main purpose of the present invention is to provide a CMOS image sensor for solving at least one of the above technic...

AI Technical Summary

Problems solved by technology

[0002] There is a compromise between the imaging frame rate and imaging resolution of CMOS (Complementary Metal Oxide Semiconductor) image sensors. Usually, once a CMOS image sensor is produced, the highest imaging frame rate and maximum resolution are determined and cannot be adjusted.

In addition, high-speed CMOS image sensors mostly adopt a column-parallel readout structure, each column is equipped with a readout circuit, so the area of ​​the readout circuit is relatively large, and at the same time, the layout of the column readout circuit is implemented in a narrow strip space (usually micron level). bring difficulties

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