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| Content Provider | IEEE Xplore Digital Library |
|---|---|
| Author | Kuanfu Chen Yi-Kai Lo Wentai Liu |
| Copyright Year | 2013 |
| Description | Author affiliation: Univ. of California, Los Angeles, Los Angeles, CA, USA (Kuanfu Chen; Yi-Kai Lo; Wentai Liu) |
| Abstract | Retinal implants elicit light perception for people blinded by photoreceptor loss. Commercialized 60-channel retinal prostheses allow patients to perform simple tasks, but several hundreds to a thousand electrodes are required for face recognition/reading [1,2], posing great challenges for the design of next-generation retinal stimulators. Aside from the higher power/data demand, the electrode impedance is also increased. Placing 1000 epiretinal electrodes in the 5mm-diameter macula region reduces the electrode size to less than $0.01mm^{2},$ leading to a 30kΩ electrode-tissue impedance [2]. To elicit light perception of various brightness levels, the stimulators for epiretinal prostheses require an output compliance voltage of ±10V [3], thus requiring area-consuming high-voltage (HV) transistors. The stimulator in [4] achieves 1600 channels, but it is designed for subretinal rather than epiretinal prostheses. It has ±2V compliance and needs a separate chip for power telemetry. For epiretinal prostheses, an HV-compliant 1024-channel stimulator in [3] is estimated to occupy $64mm^{2}$ and requires off-chip diodes for power rectification. For a space-restricted retinal implant, a small-sized fully integrated SoC with minimal number of off-chip components is preferred. |
| Sponsorship | IEEE Solid-State Circuits Soc. |
| Starting Page | 294 |
| Ending Page | 295 |
| File Size | 1902565 |
| Page Count | 2 |
| File Format | |
| ISBN | 9781467345156 |
| ISSN | 01936530 |
| e-ISBN | 9781467345163 |
| DOI | 10.1109/ISSCC.2013.6487741 |
| Language | English |
| Publisher | Institute of Electrical and Electronics Engineers, Inc. (IEEE) |
| Publisher Date | 2013-02-17 |
| Publisher Place | USA |
| Access Restriction | Subscribed |
| Rights Holder | Institute of Electrical and Electronics Engineers, Inc. (IEEE) |
| Subject Keyword | System-on-chip Switches Rectifiers Differential phase shift keying Arrays Retina Electrodes |
| Content Type | Text |
| Resource Type | Article |
| Subject | Electronic, Optical and Magnetic Materials Electrical and Electronic Engineering |
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