A 640×640 Fully Dynamic CMOS Image Sensor for Always-On Object Recognition

This paper presents a 640\times 640 fully dynamic CMOS image sensor for always-on object recognition. A pixel output is sampled with a dynamic source follower (SF) into a parasitic column capacitor, which is readout by a dynamic single-slope (SS) ADC based on a dynamic bias comparator and an energy-...

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Bibliographic Details
Published in2019 Symposium on VLSI Circuits pp. C214 - C215
Main Authors Park, Injun, Jo, Woojin, Park, Chanmin, Park, Byungchoul, Cheon, Jimin, Chae, Youngcheol
Format Conference Proceeding
LanguageEnglish
Published JSAP 01.06.2019
Subjects
Capacitors
CMOS image sensors
Energy efficiency
Object recognition
Power demand
Redundancy
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Summary:This paper presents a 640\times 640 fully dynamic CMOS image sensor for always-on object recognition. A pixel output is sampled with a dynamic source follower (SF) into a parasitic column capacitor, which is readout by a dynamic single-slope (SS) ADC based on a dynamic bias comparator and an energy-efficient two-step counter. The sensor, implemented in a 0.11μm CMOS, achieves 0.3% peak non-linearity, 6.8e_{rms}^{-} RN and 67dB DR. Its power consumption is only 2.1mW at 44fps and is further reduced to 260μW at 15fps with sub-sampled 320 × 320 mode. This work achieves the state-of-the-art energy-efficiency FoM of 0.7e^{-}\cdot nJ.
ISSN:2158-5636
DOI:10.23919/VLSIC.2019.8778169