Sensory particles with optical telemetry

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

Sensory particles with optical telemetry

Conference paper (2020)

Authors

Karthik Ganesan Stanford University

Thomas A. Flores Stanford University

Binh Q. Le Stanford University, San José State University

D.G. Muratore Stanford University

Neal Patel Stanford University

Subhasish Mitra Stanford University

Boris Murmann Stanford University

Daniel Palanker Stanford University

Affiliation

External organisation

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

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Published Date

2020

Language

English

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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.