Author(s): Wu, JC (Wu, Jiangchao); Lu, X (Lu, Xin); Law, MK (Law, Man-Kay); Jiang, Y (Jiang, Yang); Liu, LY (Liu, Liyuan); Mak, PI (Mak, Pui-In); Martins, RP (Martins, Rui P.)

Source: IEEE SENSORS JOURNAL Volume: 22 Issue: 13 Pages: 12808-12819 DOI: 10.1109/JSEN.2022.3179394 Published: JUL 1 2022

Abstract: This work presents a 128 x 128 multi-function CMOS vision sensor with motion direction detection (MDD) and simultaneous energy harvesting (EH) capability, featuring: 1) light weight template-based optical flow (OF) algorithm for on-chip MDD with high energy efficiency and small area overhead; and 2) independent imaging and energy harvesting (EH) operations using vertically stacked N+/PW and PW/DNW+DNW/PSUB junctions without photodiode reconfiguration. Fabricated in 0.18 mu m standard CMOS, this work demonstrates the first CMOS vision sensor featuring both MDD and EH modes within a compact pixel pitch of 4.75 mu m. With a power consumption of 10.5 mu W at 15fps in MDD mode, the chip prototype achieves a motion sensing figure-of-merit (MS-FoM) of 171 pJ/pixel.frame, which is 30% better than the state-of-the-art MDD sensors. The proposed EH configuration achieves continuous power generation at 267pW/Ix/mm(2) irrespective of the imaging/MDD operation, demonstrating a 1.56x improvement over prior arts.

Accession Number: WOS:000819823500044

ISSN: 1530-437X

eISSN: 1558-1748

Full Text: https://ieeexplore.ieee.org/document/9789972