Shanghai Ic R&d Center Co., Ltd

Chengdu Image Design Technology Co., Ltd.

Hailing Yang

Changming Pi

Xuehong He

Yuan Yuan Zhang

Ying Luo

Chen Bo Li

Jianxin Wen

Xi Zeng

Huijie Yan

Xiaoliang Zhang

Pu Zhou

Xiameng Lian

Guidi Zhang

A method of removing fixed pattern noise, comprising: S: performing a single-frame segmented exposure on a pixel array; S: reading a of the pixel array, comprising: S: performing a soft reset, so as to set the reset signal of the pixel unit to an intermediate voltage, and reading a differential reset signal; S: performing a hard reset so as to set the reset signal of the pixel unit to a high voltage; S: turning on a transmission MOS transistor to enable an exposure signal of to photodiode to transmitted to the floating diffusion area, and reading a differential pixel transmission signal; S: subtracting the differential reset signal from the differential pixel transmission signal to obtain an exposure signal with fixed pattern noise removed. Another method is removing fixed pattern noise and an image sensor are further provided.

Method of removing fixed pattern noise

A full-frame image sensor system comprises at least a pair of readout circuits, at least a pair of channel selection circuits, and at least a pair of interface circuits arranged symmetrically with respect to a pixel array; the readout circuits are electrically connected to two sides of the pixel array respectively; the channel selection circuit and the readout circuit on a same side of the pixel array are electrically connected to each other. The interface circuit and the channel selection circuit on a same side of the pixel array are electrically connected to each other. As a result, the circuits on the two sides of the pixel array are substantially symmetrical, the center of the pixel array coincides with the center of the entire chip. It not only brings convenience to the subsequent packaging and application, but also reduces the size of circuit such as the PGA and the ADC on one side of the pixel array, and overcomes the problem that the capacity of circuit such as the PGA and the ADC cannot be increased when the height of the circuits such as the PGA and the ADC cannot exceed the height of the pixel array.

Full-frame image sensor system

A system and method for regulating transfer characteristics of an integral analog-to-digital converter are provided. The system comprises a cascade N-stage integrator structure having N integrators, the input end of the first integrator is connected to a voltage, the output end of each integrator is connected to the input end of the adjacent integrator, and the output end of the Nth integrator is connected to an output node (VRAMP). Wherein, the N is positive integer greater than or equal to 2. In the cascade multistage integrator structure, the voltage of the output node (VRAMP) is in direct proportion relation with the time to the power of N. By adopting a cascade multistage integrator according to the present disclosure, it is simple to regulate transfer characteristics of the ADC, and the cascade digital signal processing is convenient, which can reduce the ADC conversion time and improve the ADC conversion rate. Compared with the existing polyline mode, the present disclosure has better linearity; and it can be easily extended to cascade multistage integrators.

System and method for regulating transfer characteristics of integral analog-to-digital converter

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Shanghai, China

Hailing Yang