Title :
A 0.5V 4.95μW 11.8fps PWM CMOS imager with 82dB dynamic range and 0.055% fixed-pattern noise
Author :
Chung, Meng-Ting ; Hsieh, Chih-Cheng
Author_Institution :
Nat. Tsing Hua Univ., Hsinchu, Taiwan
Abstract :
In this paper, a 0.5V 64×40-pixel PWM imager is prototyped in standard 0.18μm CMOS. A threshold-variation-cancelling (TVC) scheme is developed to solve the non-uniformity issue of in-pixel comparators, which results in 0.055% fixed-pattern noise (FPN). To deal with the limited signal swing at 0.5V operation, a programmable current-controlled threshold (PCCT) scheme is implemented to achieve a 56.5dB boost in dynamic range.
Keywords :
CMOS image sensors; circuit noise; comparators (circuits); pulse width modulation; PCCT scheme; PWM CMOS imager; fixed pattern noise; in-pixel comparators; nonuniformity issue; power 4.95 muW; programmable current-controlled threshold; size 0.18 mum; threshold variation cancelling; voltage 0.5 V; CMOS integrated circuits; Dynamic range; Generators; Noise; Pulse width modulation; Semiconductor device measurement; Sensors;
Conference_Titel :
Solid-State Circuits Conference Digest of Technical Papers (ISSCC), 2012 IEEE International
Conference_Location :
San Francisco, CA
Print_ISBN :
978-1-4673-0376-7
DOI :
10.1109/ISSCC.2012.6176942
