標題: A new CMOS pixel structure for low-dark-current and large-array-size still imager applications
作者: Shih, YC
Wu, CY
電子工程學系及電子研究所
Department of Electronics Engineering and Institute of Electronics
關鍵字: CMOS images;dark current;pseudoactive pixel sensor (PAPS);readout circuit
公開日期: 1-十一月-2004
摘要: A new pixel structure for still CMOS imager application called the psedoactive pixel sensor (PAPS) is proposed and analyzed in this paper. It has the advantages of a low dark current, high signal-to-noise ratio, and a high fill factor over the conventional passive pixel sensor imager or active pixel sensor imager. The readout circuit called the zero-bias column buffer-direct-injection structure is also proposed to suppress both the dark current of the photodiode and the leakage current of row switches by keeping both biases of photodiode and the parasitic p-n junction in the column bus at or near zero voltage. The improved double delta sampling circuits are also used to suppress fixed pattern noise, clock feedthrough noise, and channel charge injection. An experimental chip of the proposed PAPS. CMOS imager with the format of 352 x 288 (CIF) has been fabricated by using a 0.25-mum single-poly-five-level-metal (1P5M) n-well CMOS process. The pixel size is 5.8 mum x 5.8 mum. The pixel readout speed is from 100 kHz to 10 MHz, corresponding to the maximum frame rate above 30 frames/s. The proposed still CMOS imager has a fill factor of 58%, chip size of 3660 mum x 3500 mum, and power dissipation of 24 mW under the power supply of 3.3 V. The experimental chip has successfully demonstrated the function of the proposed new PAPS structure. It can be applied in the design of large-array-size still CMOS imager systems with a low dark current and high resolution.
URI: http://dx.doi.org/10.1109/TCSI.2004.835684
http://hdl.handle.net/11536/25673
ISSN: 1057-7122
DOI: 10.1109/TCSI.2004.835684
期刊: IEEE TRANSACTIONS ON CIRCUITS AND SYSTEMS I-REGULAR PAPERS
Volume: 51
Issue: 11
起始頁: 2204
結束頁: 2214
顯示於類別:期刊論文


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  1. 000225080800011.pdf