Title :
The approach to rail-to-rail CMOS active pixel sensor for portable applications
Author :
Xu, Chen ; Chan, Mansun
Author_Institution :
Dept. of Electr. & Electron. Eng., Hong Kong Univ. of Sci. & Technol., Kowloon, China
Abstract :
We have proposed an innovative structure of low-voltage rail-to-rail CMOS Active Pixel Sensor (APS), which can work at 1.2 V supply voltage with relative high dynamic range and signal to noise ratio. It is a suitable alternative for the conventional active pixel in portable applications. Compared with the conventional pixel, it surpasses the bottleneck of the voltage limitation and makes the signal voltage as large as possible. We also implement the photodiode type rail-to-rail CMOS active pixel in commercially available 0.25 μm CMOS technology, with a fill factor of 30% and pixel size of 12 μm×10 μm
Keywords :
CMOS image sensors; cameras; image sampling; low-power electronics; 1.2 V; ADC; correlated double sampling; digital cameras; fill factor; low-voltage sensor; photodiode type active pixel; portable applications; rail-to-rail CMOS active pixel sensor; relatively high dynamic range; scaling approach; CMOS image sensors; CMOS technology; Dynamic range; Image sensors; Low voltage; MOS devices; Operational amplifiers; Pulse amplifiers; Signal to noise ratio; Telephony;
Conference_Titel :
TENCON 2001. Proceedings of IEEE Region 10 International Conference on Electrical and Electronic Technology
Print_ISBN :
0-7803-7101-1
DOI :
10.1109/TENCON.2001.949710
