A modulator and driver for a high-efficiency ultrasonic link providing power and signal to an implanted hearing aid

Hugo Vihvelin, Jeff Leadbetter, Jeremy A. Brown, Rob B. Adamson

Résultat de recherche: Conference articleexamen par les pairs

Résumé

We present results from the design and testing of a high-efficiency amplitude modulation and demodulation circuit for use in an ultrasonic power link for implanted hearing aids. The modulator provides an 8 KHz modulation bandwidth around a carrier frequency of 1.024 MHz and achieves high efficiency from a switched driver design employing a 50 KHz ramp-compare pulse-width modulation scheme. It can deliver 27.2mW to an ultrasonic link with 76% efficiency. The design of an implanted demodulator circuit is also discussed. When coupled to a set of matched high-efficiency ultrasound transmitter/receiver transducers achieving a 45% transmission efficiency, this system holds promise as a compact, lightweight, highly directional means of providing power and signal to implanted devices.

Langue d'origineEnglish
Numéro d'article030028
JournalProceedings of Meetings on Acoustics
Volume19
DOI
Statut de publicationPublished - 2013
Événement21st International Congress on Acoustics, ICA 2013 - 165th Meeting of the Acoustical Society of America - Montreal, QC, Canada
Durée: juin 2 2013juin 7 2013

ASJC Scopus Subject Areas

  • Acoustics and Ultrasonics

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