A Load-Insensitive Hybrid Back Telemetry System for Wirelessly-Powered Implantable Devices

Hyun Su Lee, Minjae Kim, Jisan Ahn, Hyung Min Lee

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

This paper presents a hybrid load-shift-keying (LSK) system for load-insensitive back telemetry to realize near-constant voltage changes on a primary coil against a wide range of load variations. The hybrid-LSK-enabled full-wave rectifier includes built-in open-coil and short-coil functions for hybrid-LSK modulation. When the load changes from 50 Ω to 50 \mathrm{k}\Omega, the variation of voltage change levels on the primary coil can be minimized to 60 mV, achieving 88% reduction compared to the conventional short-coil LSK with 510 mV variation. The 180-nm CMOS hybrid-LSK prototype verified that the normalized variation of voltage changes (VARvc) was reduced by 34.1% compared to short-coil LSK. The primary coil voltage changes can be demodulated with slope detection, enabling robust back telemetry against load variations.

Original languageEnglish
Title of host publicationBioCAS 2021 - IEEE Biomedical Circuits and Systems Conference, Proceedings
PublisherInstitute of Electrical and Electronics Engineers Inc.
ISBN (Electronic)9781728172040
DOIs
Publication statusPublished - 2021
Event2021 IEEE Biomedical Circuits and Systems Conference, BioCAS 2021 - Virtual, Online, Germany
Duration: 2021 Oct 62021 Oct 9

Publication series

NameBioCAS 2021 - IEEE Biomedical Circuits and Systems Conference, Proceedings

Conference

Conference2021 IEEE Biomedical Circuits and Systems Conference, BioCAS 2021
Country/TerritoryGermany
CityVirtual, Online
Period21/10/621/10/9

Keywords

  • Back telemetry
  • hybrid load-shift-keying (LSK)
  • load-insensitive
  • slope detector
  • wireless power transfer

ASJC Scopus subject areas

  • Hardware and Architecture
  • Biomedical Engineering
  • Electrical and Electronic Engineering

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