Infrared and Laser Engineering, Volume. 46, Issue 1, 120002(2017)

CMOS image senor design with AC-coupled CTIA and digital CDS

Zou Mei*... Chen Nan and Yao Libin |Show fewer author(s)
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    A CMOS image sensor with coupling capacitor based AC-coupled CTIA and digital CDS was proposed. By adding a coupling capacitor to the conventional CTIA circuit, the dark current of the photodiode was reduced via controlling the bias voltage of the photodiode; Meanwhile, an off-chip digital CDS was adopted to reduce the reset noise of the pixel and the FPN by realizing the subtraction algorithm between the reset signal and pixel signal after A/D conversion off-chip. This CMOS image sensor was implemented in the 0.35 μm standard CMOS technology. The pixel array was 256×256, and the pixel size was 16 μm×16 μm. The experimental results show that the dark current can be minimized by reducing the bias of the photodiode nearby zero. The temporal noise and FPN are obviously reduced after adopting the off-chip digital CDS.

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    Zou Mei, Chen Nan, Yao Libin. CMOS image senor design with AC-coupled CTIA and digital CDS[J]. Infrared and Laser Engineering, 2017, 46(1): 120002

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    Paper Information

    Category: 光电器件与微系统

    Received: May. 11, 2016

    Accepted: Jun. 13, 2016

    Published Online: Mar. 29, 2017

    The Author Email: Mei Zou (bill_zom@126.com)

    DOI:10.3788/irla201746.0120002

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