Time-Of-Flight Chip in Standard Cmos Technology with In-Pixel Adaptive Number of Accumulations
2016 IEEE International Symposium on Circuits and Systems (ISCAS)(2016)
Abstract
This paper introduces a Time-of-Flight sensor of 50 × 60 pixels in standard CMOS 0.18 μm technology with in-pixel adaptive number of accumulations and background suppression. Background suppression is carried out through two mechanisms, namely, the increase of signal to background ratio, and background subtraction. The pixel features a fill factor of 77% with an nwell over p-substrate diode of 50 × 50 μm 2 . The pixel senses the photocurrent through a transimpedance amplifier. Adaptive accumulations are performed with an in-pixel comparator that is also used for per-column A/D conversion as part of an 8-bit single-slope ADC. The sensor works with 4 square pulses of 50 ns. Simulations show that the chip could measure distances up to 7.5 m without optical filters for background levels up to 20 klux at video frame rate.
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Key words
time-of-flight chip,CMOS technology,in-pixel adaptive number,time-of-flight sensor,background suppression,background subtraction,fill factor,p-substrate diode,photocurrent,transimpedance amplifier,adaptive accumulations,in-pixel comparator,analogue-digital conversion,A-D conversion,single-slope ADC,video frame rate,size 0.18 mum,size 50 mum
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