TY - GEN
T1 - A Load-Insensitive Hybrid Back Telemetry System for Wirelessly-Powered Implantable Devices
AU - Lee, Hyun Su
AU - Kim, Minjae
AU - Ahn, Jisan
AU - Lee, Hyung Min
N1 - Funding Information:
This work was supported by the National Research Foundation of Korea (NRF-2020R1F1A1074719 and NRF-2020M3A7B4036776) funded by Ministry of Science & ICT. The EAD tools and chip fabrication were supported by IC Design Education Center (IDEC), Korea
Publisher Copyright:
© 2021 IEEE.
PY - 2021
Y1 - 2021
N2 - 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.
AB - 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.
KW - Back telemetry
KW - hybrid load-shift-keying (LSK)
KW - load-insensitive
KW - slope detector
KW - wireless power transfer
UR - http://www.scopus.com/inward/record.url?scp=85124194824&partnerID=8YFLogxK
U2 - 10.1109/BioCAS49922.2021.9644982
DO - 10.1109/BioCAS49922.2021.9644982
M3 - Conference contribution
AN - SCOPUS:85124194824
T3 - BioCAS 2021 - IEEE Biomedical Circuits and Systems Conference, Proceedings
BT - BioCAS 2021 - IEEE Biomedical Circuits and Systems Conference, Proceedings
PB - Institute of Electrical and Electronics Engineers Inc.
T2 - 2021 IEEE Biomedical Circuits and Systems Conference, BioCAS 2021
Y2 - 6 October 2021 through 9 October 2021
ER -