期刊
IEEE TRANSACTIONS ON BIOMEDICAL CIRCUITS AND SYSTEMS
卷 14, 期 6, 页码 1230-1240出版社
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/TBCAS.2020.3036091
关键词
Retina; Neuromorphics; Dispersion; Power demand; Regulation; Visualization; Finite element analysis; Distributed image processor; image processor; retinal prosthesis; neural prosthesis; neuromorphic; neuromorphic image processor; temperature regulation; temperature safety
资金
- A*STAR AME Nanosystems at the Edge program [A18A4b0055]
- Hybrid-Integrated Flexible Electronic Systems under Program HiFES, WBS of National University of Singapore (NUS) [R-263-501-0011-133/731]
A 1225-Channel Neuromorphic Retinal Prosthesis (RP) SoC is presented. Existing RP SoCs directly convert light intensity to electrical stimulus, which limit the adoption of delicate stimulus patterns to increase visual acuity. Moreover, a conventional centralized image processor leads to the local hot spot that poses a risk to the nearby retinal cells. To solve these issues, the proposed SoC adopts a distributed Neuromorphic Image Processor (NMIP) located within each pixel that extracts the outline of the incoming image, which reduces current dispersion and stimulus power compared with light-intensity proportional stimulus pattern. A spike-based asynchronous digital operation results in the power consumption of 56.3 nW/Ch without local temperature hot spot. At every 5x5 pixels, the localized (49-point) temperature-regulation circuit limits the temperature increase of neighboring retinal cells to less than 1 degrees C, and the overall power consumption of the SoC to be less than that of the human eye. The 1225-channel SoC fabricated in 0.18 mu m 1P6M CMOS occupies 15mm(2) while consuming 2.7 mW, and is successfully verified with image reconstruction demonstration.
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