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arXiv 1807.11577physics.ins-detphysics.app-ph
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CMOS图像传感器像素内斩波1/f噪声抑制

1/f Noise Reduction using In-Pixel Chopping in CMOS Image Sensor

Kapil Jainwal, Mukul Sarkar

摘要:

提出了一种降低有源像素传感器(APS)源极跟随器(SF)晶体管低频噪声的像素内斩波技术。SF低频噪声通过斩波在较高频率处调制,在像素内实现,并且在后期使用低通滤波消除。为了实现斩波,传统的3 T APS架构进行了修改,每个像素只有一个额外的晶体管的最小尺寸。噪声的减少还增强了图像传感器的动态范围(DR)。测试电路采用UMC 0.18 μ m标准CMOS工艺制作。测量结果表明,在50 MHz斩波频率下,1/f噪声降低约22 dB。

英文摘要:

In this paper, an in-pixel chopping technique to reduce the low-frequency or 1/f noise of the source follower (SF) transistor in an active pixel sensor (APS) is presented. The SF low-frequency noise is modulated at higher frequencies through chopping, implemented inside the pixel, and in later stage eliminated using low-pass filtering. To implement the chopping, the conventional 3T APS architecture is modified, with only one additional transistor of minimum size per pixel. Reduction in the noise also enhances the dynamic range (DR) of the image sensor. The test circuit is fabricated in UMC 0.18 um standard CMOS technology. The measured results show a reduction of 1/f noise by approximately 22 dB for 50 MHz chopping frequency.

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