Sensory particles with optical telemetry

Karthik Ganesan*, Thomas A. Flores, Binh Q. Le, Dante G. Muratore, Neal Patel, Subhasish Mitra, Boris Murmann, Daniel Palanker

*Corresponding author for this work

Research output: Chapter in Book/Conference proceedings/Edited volumeConference contributionScientificpeer-review

Abstract

Current retinal prostheses provide electrical stimulation without feedback from the stimulated neurons. Incorporation of multichannel recording electronics would typically require trans-scleral cables for power supply and data transmission. In this work, we explore a wireless, optoelectronic, miniature, modular, and distributed electro-neural interface for recording, which we call Sensory Particles with Optical Telemetry (SPOT). It can be used in an advanced, bi-directional retinal prosthesis and other sensory applications. Emphasis is placed on the novel telemetry stage. SPOTs are powered by near-infrared light and transmit information by light. As a proof of concept, we designed and built a low-power, small-footprint linear transconductance circuit utilizing chopper stabilization in 130nm CMOS. Our design achieved 57 mS transconductance within 3.5 kHz bandwidth, and a near-infrared (NIR) power density of 0.5 mW/mm2, well within the ocular and thermal safety limits. The telemetry circuit consumes 0.015 mm2 area, and each SPOT can be powered by a single photovoltaic (PV) supply of area 0.0056 mm2. Electrical spikes transmitted by an 850nm LED were detected with 15 dB SNR, at the output of the optical link.

Original languageEnglish
Title of host publication2020 IEEE International Symposium on Circuits and Systems, ISCAS 2020 - Proceedings
PublisherIEEE
ISBN (Electronic)9781728133201
Publication statusPublished - 2020
Externally publishedYes
Event52nd IEEE International Symposium on Circuits and Systems, ISCAS 2020 - Virtual, Online
Duration: 10 Oct 202021 Oct 2020

Publication series

NameProceedings - IEEE International Symposium on Circuits and Systems
Volume2020-October
ISSN (Print)0271-4310

Conference

Conference52nd IEEE International Symposium on Circuits and Systems, ISCAS 2020
CityVirtual, Online
Period10/10/2021/10/20

Keywords

  • Biomedical electronics
  • Biomedical telemetry
  • Near-Infrared light
  • Neural recording
  • Optical telemetry

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