$A Sub-mm$^3$ Ultrasonic Free-floating Implant for Multi-mote Neural Recording$

A Sub-mm$^3$ Ultrasonic Free-floating Implant for Multi-mote Neural Recording

A 0.8 mm$^3$ wireless, ultrasonically powered, free-floating neural recording implant is presented. The device is comprised only of a 0.25 mm$^2$ recording IC and a single piezoceramic resonator that is used for both power harvesting and data transmission. Uplink data transmission is performed b...

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Veröffentlicht in:	arXiv.org 2019-07
Hauptverfasser:	Mohammad Meraj Ghanbari, Piech, David K, Shen, Konlin, Sina Faraji Alamouti, Yalcin, Cem, Johnson, Benjamin C, Carmena, Jose M, Maharbiz, Michel M, Muller, Rikky
Format:	Artikel
Sprache:	eng
Schlagworte:	Amplitude modulation Amplitudes Data transmission Energy harvesting Implants Recording Subcarriers Transplants & implants Ultrasonic imaging Ultrasonic testing Ultrasound
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description	A 0.8 mm$^3$ wireless, ultrasonically powered, free-floating neural recording implant is presented. The device is comprised only of a 0.25 mm$^2$ recording IC and a single piezoceramic resonator that is used for both power harvesting and data transmission. Uplink data transmission is performed by analog amplitude modulation of the ultrasound echo. Using a 1.78 MHz main carrier, >35 kbps/mote equivalent uplink data rate is achieved. A technique to linearize the echo amplitude modulation is introduced, resulting in 2.5x, resulting in the highest measured depth/volume ratio by $\sim$3x. Orthogonal subcarrier modulation enables simultaneous operation of multiple implants, using a single-element ultrasound external transducer. Dual-mote simultaneous power up and data transmission is demonstrated at a rate of 7 kS/s at the depth of 50 mm.
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subjects	Amplitude modulation Amplitudes Data transmission Energy harvesting Implants Recording Subcarriers Transplants & implants Ultrasonic imaging Ultrasonic testing Ultrasound
title	A Sub-mm$^3$ Ultrasonic Free-floating Implant for Multi-mote Neural Recording
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A Sub-mm\(^3\) Ultrasonic Free-floating Implant for Multi-mote Neural Recording