Integrated High-Temporal-Resolution and High-Density Subretinal Prosthesis Using a Correlated Double-Sampling Techniqueopen access
- Authors
- Kang, Hosung; Kim, Jungyeon; Kim, Jungsuk
- Issue Date
- Jul-2023
- Publisher
- MDPI
- Keywords
- subretinal prosthesis; image sensor; high-density pixels; neural stimulator; implantable device; temporal resolution; correlated double sampling; current amplifier
- Citation
- SENSORS, v.23, no.14
- Journal Title
- SENSORS
- Volume
- 23
- Number
- 14
- URI
- https://scholarworks.bwise.kr/gachon/handle/2020.sw.gachon/88791
- DOI
- 10.3390/s23146501
- ISSN
- 1424-8220
- Abstract
- This paper presents a 1600-pixel integrated neural stimulator with a correlated double-sampling readout (DSR) circuit for a subretinal prosthesis. The retinal stimulation chip inserted beneath the photoreceptor layer comprises an array of an active pixel sensor (APS) and biphasic pulse shaper. The DSR circuit achieves a high signal-to-noise ratio (SNR) of the APS with a short integration time to simultaneously improve the temporal and spatial resolutions of restored vision. This DSR circuit is adopted along with a 5 x 5-pixel tile, which reduces pixel size and improves the SNR by increasing the area occupied by storage capacitors. Moreover, a low-mismatch reference generator enables a low standard deviation between individual pulse shapers. The 1600-pixel retinal chip, fabricated using the 0.18 & mu;m 1P6M CMOS process, occupies a total area of 4.3 mm x 3.3 mm and dissipates an average power of 3.4 mW; this was demonstrated by determining the stimulus current patterns corresponding to the illuminations of an LCD projector. Experimental results show that the proposed high-density stimulation array chip can achieve a high temporal resolution owing to its short integration time.
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