A four transistor CMOS active pixel sensor with high dynamic range operation

  title={A four transistor CMOS active pixel sensor with high dynamic range operation},
  author={Che-I Lin and Cheng-Hsiao Lai and Y. King},
  journal={Proceedings of 2004 IEEE Asia-Pacific Conference on Advanced System Integrated Circuits},
A new CMOS APS using standard CMOS logic technology is proposed to allow high dynamic range operation. The new cell is constructed by incorporating one additional transistor to the conventional three transistor APS. The experimental results demonstrate that extended dynamic range is obtained when operates with a ramped reference voltage source. The cell offers flexible nonlinear transfer characteristics, which can be designed by modifying the operational timing diagram. Furthermore, charge… Expand
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A 256 x 256 CMOS imaging army with wide dynamic range pixels and column - parallel digital output