open access

https://hdl.handle.net/2115/26422

A Wide-Dynamic-Range Compression Image Sensor With Negative-Feedback Resetting

英語

negative-feedback reset

2007-05

IEEE

IEEE Sensors Journal

7(5)

897-904

A CMOS image sensor capable of wide-dynamic-range compression is proposed. This sensor has two main features. It uses a negative-feedback technique to set any intermediate voltage into photodiode (PD) capacitance in the pixel circuit. It also uses a quasi-holding function by resetting the pixel-output voltage into PD capacitance. Dynamic range compression is achieved by individually selecting pixels and by setting an intermediate voltage or performing quasi-holding with respect to each pixel. Output data has a polygon-like form corresponding to a change from high sensitivity to low sensitivity as optical intensity becomes stronger. Experimental results obtained with a chip fabricated using a 0.25-mum CMOS process demonstrate dynamic range compression.

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©2007 IEEE. Personal use of this material is permitted. However, permission to reprint/republish this material for advertising or promotional purposes or for creating new collective works for resale or redistribution to servers or lists, or to reuse any copyrighted component of this work in other works must be obtained from the IEEE. IEEE, IEEE SENSORS JOURNAL, 7, 5, 2007, 897-904.

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