A 90 µW at 1 fps and 1.33 mW at 30 fps 120-dB Intrascene Dynamic Range 640 × 480 Stacked Image Sensor for Autonomous Vision Systems
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Author
Rüedi, Pierre-François
Quaglia, Riccardo
Graf, Hans-Rudolf
DOI
10.1109/LSSC.2024.3370797
Abstract
We present an ultralow-power high dynamic range (DR) image sensor dedicated to autonomous vision systems, produced in a back illuminated 65 nm/40 nm stacked process and based on a time-to-digital pixel with in-pixel A/D conversion and data memory. Key to the low-power consumption is a new in-pixel comparator without dc current consumption. The 120-dB intrascene DR of the sensor, encoded on 10 bits, makes use of a logarithmic data representation. Thanks to the high intrascene DR, no adaptation to the local illumination is necessary. The sensor has a sensitivity of 6.4 V/lux/s, an FPN of 0.6%, and a temporal noise of 11 e−, with a pixel pitch of 6.3μm and a fill factor of 86%.
Publication Reference
IEEE Solid State Circuit Letters, Vol. 7, pp. 106-109
Year
2024-02
Sponsors
This work was supported by Innosuisse under Grant 34950_1_ IP-ENG_190823.