DocumentCode :
23568
Title :
A Linear-Logarithmic CMOS Image Sensor With Pixel-FPN Reduction and Tunable Response Curve
Author :
Wei-Fan Chou ; Shang-Fu Yeh ; Chin-Fong Chiu ; Chih-Cheng Hsieh
Author_Institution :
Dept. of Electr. Eng., Nat. Tsing Hua Univ., Hsinchu, Taiwan
Volume :
14
Issue :
5
fYear :
2014
fDate :
May-14
Firstpage :
1625
Lastpage :
1632
Abstract :
This paper presents a high dynamic range (DR) linear-logarithmic (Lin-Log) CMOS image sensor (CIS) pixel with threshold voltage cancellation technique for pixel fixed pattern noise (PFPN) reduction. A tunable pixel response curve was applied for different environments. To avoid the gain loss of source follower in conventional APS structure, a column shared-amplifier with programmable gain was also applied. A prototype high DR Lin-Log CIS chip consisting of 100 × 100 5-T pixel array with n+/p-sub photodiode, a pixel area of 6 × 6 μm2, and 3.3 V operation was designed and fabricated in TSMC 0.18 μm CMOS 1P6M standard process. The measured results achieved a DR of 143 dB, a PFPN related to sensitivity in logarithmic response (rms/log-sensitivity) of 1.96%, and a PFPN related to full-swing in logarithmic response (rms/Vlog-swing) of 0.45%. Linear and logarithmic sensitivity were 651 mV/lux-s and 55 mV per decade of illumination, respectively, at 50 fps. The temporal noise and power consumption were 0.746 m Vrms and 1.88 mW, respectively.
Keywords :
CMOS image sensors; circuit tuning; integrated circuit noise; low-power electronics; TSMC CMOS 1P6M standard process; column sharedamplifier; linear-logarithmic CMOS image sensor; logarithmic response; pixel fixed pattern noise reduction; pixel-FPN reduction; power 1.88 mW; power consumption; size 0.18 mum; temporal noise; threshold voltage cancellation technique; tunable pixel response curve; voltage 3.3 V; CMOS image sensors; Dynamic range; Lighting; Noise; Photodiodes; Threshold voltage; CMOS image sensor (CIS); high dynamic range (DR); linear-logarithmic response (Lin-Log); pixel fixed pattern noise (PFPN);
fLanguage :
English
Journal_Title :
Sensors Journal, IEEE
Publisher :
ieee
ISSN :
1530-437X
Type :
jour
DOI :
10.1109/JSEN.2013.2294740
Filename :
6683003
Link To Document :
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