Analog reading preprocessing circuit for CMOS image sensor and control method thereof

An image sensor and preprocessing circuit technology, applied in image communication, television, electrical components, etc., can solve the problems of long analog readout time and large readout noise, so as to improve performance, increase readout speed, and reduce circuit noise Effect

Active Publication Date: 2015-03-25
INST OF SEMICONDUCTORS - CHINESE ACAD OF SCI
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] In the prior art, the analog readout preprocessing circuit only samples and converts the reset signal and the effective light intensity signal output by the image sensor once, res

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  • Analog reading preprocessing circuit for CMOS image sensor and control method thereof
  • Analog reading preprocessing circuit for CMOS image sensor and control method thereof
  • Analog reading preprocessing circuit for CMOS image sensor and control method thereof

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Embodiment Construction

[0047] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be described in further detail below in conjunction with specific embodiments and with reference to the accompanying drawings. It should be noted that, in the drawings or descriptions of the specification, similar or identical parts all use the same figure numbers. Implementations not shown or described in the accompanying drawings are forms known to those of ordinary skill in the art. Additionally, while illustrations of parameters including particular values ​​may be provided herein, it should be understood that the parameters need not be exactly equal to the corresponding values, but rather may approximate the corresponding values ​​within acceptable error margins or design constraints.

[0048] In the analog readout preprocessing circuit for CMOS image sensors provided by the present invention, the extended counting integral, cycle-successive a...

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Abstract

The invention discloses an analog reading preprocessing circuit for a CMOS image sensor and a control method of the analog reading preprocessing circuit. The analog reading preprocessing circuit comprises an extended counting integration cycle-successive approximation mixed type analog-digital conversion capacitor network, an operational amplifier, a comparator and a control signal generator. The extended counting integration cycle -successive approximation mixed type analog-digital conversion capacitor network is used for achieving reading and analog-digital conversion of output signals of the CMOS image sensor; the operational amplifier is used for achieving the extended counting integration cycle-successive approximation mixed type analog-digital conversion function on the basis of virtual-short of the two input ends of the operational amplifier and the principle of charge conservation, and extended counting integration can effectively lower thermal noise and flicker noise in the image sensor. The comparator is used for comparing voltages of the two ends and completing signal quantization. The control signal generator is used for providing control signals.

Description

technical field [0001] The invention relates to the technical field of integrated circuits, in particular to an analog readout preprocessing circuit for a complementary metal oxide semiconductor (CMOS) image sensor and a control method thereof. Background technique [0002] A CMOS image sensor is a type of solid-state image sensor. A CMOS image sensor with a resolution of M×N generally includes an image sensor array (with a size of M×N), an analog readout processing circuit, and a digital control module. Among them, the size of the analog readout processing circuit is 1×P, 1≤P≤N; where P=1, serial readout, with the lowest parallelism, mainly used for low-speed image sensors; P=N, full-column parallel readout , with the highest degree of parallelism, mainly used for high-speed image sensors. [0003] figure 1 It is a structural block diagram of an analog readout processing circuit for a solid-state image sensor in the prior art. Please refer to figure 1 , the analog read...

Claims

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Application Information

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IPC IPC(8): H04N5/374H04N5/357H04N5/378
Inventor 刘力源吴南健郭志强
Owner INST OF SEMICONDUCTORS - CHINESE ACAD OF SCI
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