An Optically Addressed Nanowire-Based Retinal Prosthesis With Wireless Stimulation Waveform Control and Charge Telemetering
Current retinal prostheses (RPs) have not achieved useful vision restoration, as their resolution is limited by power dissipation and complexity of interconnect. This article presents an inductively powered wireless system on a chip (SoC) for an electrically controlled, optically addressed retinal p...
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| Veröffentlicht in: | IEEE journal of solid-state circuits 2021-11, Vol.56 (11), p.3263-3273 |
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| container_title | IEEE journal of solid-state circuits |
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| creator | Akinin, Abraham Ford, Jeremy M. Wu, Jiajia Kim, Chul Thacker, Hiren D. Mercier, Patrick P. Cauwenberghs, Gert |
| description | Current retinal prostheses (RPs) have not achieved useful vision restoration, as their resolution is limited by power dissipation and complexity of interconnect. This article presents an inductively powered wireless system on a chip (SoC) for an electrically controlled, optically addressed retinal prosthetic system. The SoC interfaces to a co-fabricated nanoengineered photosensitive electrode array using only two wires. To reduce the thermal dissipation near sensitive retinal tissue, the proposed design pushes voltage regulation and charge-balanced stimulation control off the implant via a duty-cycled wireless charge metering technique. A calibration technique compensating for power fluctuation caused by eye movement is also presented. Implemented in 180-nm CMOS and delivering up to 3~\mu \text{C} of charge at 20-nC resolution, the SoC achieves 73% RF-to-stimulation power efficiency. |
| doi_str_mv | 10.1109/JSSC.2021.3113648 |
| format | Article |
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This article presents an inductively powered wireless system on a chip (SoC) for an electrically controlled, optically addressed retinal prosthetic system. The SoC interfaces to a co-fabricated nanoengineered photosensitive electrode array using only two wires. To reduce the thermal dissipation near sensitive retinal tissue, the proposed design pushes voltage regulation and charge-balanced stimulation control off the implant via a duty-cycled wireless charge metering technique. A calibration technique compensating for power fluctuation caused by eye movement is also presented. 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This article presents an inductively powered wireless system on a chip (SoC) for an electrically controlled, optically addressed retinal prosthetic system. The SoC interfaces to a co-fabricated nanoengineered photosensitive electrode array using only two wires. To reduce the thermal dissipation near sensitive retinal tissue, the proposed design pushes voltage regulation and charge-balanced stimulation control off the implant via a duty-cycled wireless charge metering technique. A calibration technique compensating for power fluctuation caused by eye movement is also presented. 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| subjects | Charge balance CMOS Engineering Engineering, Electrical & Electronic Eye movements implant Implants microelectrode array (MEA) MOS devices Nanowires neural stimulation neuroprosthesis photodiode Photosensitivity Power efficiency Power management Prostheses Prosthetics Radio frequency rectifier Retina retinal prosthesis Science & Technology Stimulation System on chip Technology Telemetering Voltage control Waveforms Wireless communication wireless power |
| title | An Optically Addressed Nanowire-Based Retinal Prosthesis With Wireless Stimulation Waveform Control and Charge Telemetering |
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