Capacitive detuning optimization for wireless uplink communication in neural implants

Author

Yilmaz, Gurkan ; Dehollain, Catherine

Author_Institution

RFIC Res. Group, Ecole Polytech. Fed. de Lausanne, Lausanne, Switzerland

fYear

2013

fDate

13-14 June 2013

Firstpage

45

Lastpage

50

Abstract

This study presents a wireless energy and data transfer system for neural implants with an emphasis on epilepsy monitoring. A wireless uplink data transmission system is built upon a remote powering system based on magnetic coupling which has been implemented previously. Uplink communication from the implant unit to the external base station is realized by shifting the resonance frequency of the load coil in the implant side. Effect of different detuning capacitances on power transfer efficiency and energy per bit is investigated. The in-vitro measurements of the system exhibits 32% power transfer efficiency while transferring 1 Mbit/s data from 10 mm distance at 8.5 MHz using a detuning capacitance of 120 pF. Furthermore, an optimization based on data rate, energy per bit, and power transfer efficiency has been proposed for the resonance frequency shift keying method.

Keywords

biomedical measurement; biomedical telemetry; data communication; frequency shift keying; bit rate 1 Mbit/s; capacitance 120 pF; capacitive detuning optimization; data transfer system; distance 10 mm; epilepsy monitoring; external base station; frequency 8.5 MHz; in-vitro measurements; magnetic coupling; neural implants; power transfer efficiency; remote powering system; resonance frequency shift keying method; wireless energy; wireless uplink communication; wireless uplink data transmission system; Capacitance; Coils; Demodulation; Implants; Uplink; Wireless communication;

fLanguage

English

Publisher

ieee

Conference_Titel

Advances in Sensors and Interfaces (IWASI), 2013 5th IEEE International Workshop on

Conference_Location

Bari

Print_ISBN

978-1-4799-0039-8

Type

conf

DOI

10.1109/IWASI.2013.6576069

Filename

6576069