A Load-Insensitive Hybrid LSK Back Telemetry System With Slope-Based Demodulation for Inductively Powered Biomedical Devices
- Authors
- Lee, Hyun-Su; Ahn, Jisan; Kang, Minil; Lee, Hyung-Min
- Issue Date
- Aug-2022
- Publisher
- IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
- Keywords
- Telemetry; Demodulation; Back; Voltage; Rectifiers; Batteries; Wireless communication; Back telemetry; hybrid load-shift keying; implantable medical device; load-insensitive data telemetry; slope-based demodulator; uplink; wireless power transfer
- Citation
- IEEE TRANSACTIONS ON BIOMEDICAL CIRCUITS AND SYSTEMS, v.16, no.4, pp.651 - 663
- Indexed
- SCIE
SCOPUS
- Journal Title
- IEEE TRANSACTIONS ON BIOMEDICAL CIRCUITS AND SYSTEMS
- Volume
- 16
- Number
- 4
- Start Page
- 651
- End Page
- 663
- URI
- https://scholar.korea.ac.kr/handle/2021.sw.korea/145544
- DOI
- 10.1109/TBCAS.2022.3192248
- ISSN
- 1932-4545
- Abstract
- This paper presents a hybrid load-shift keying (LSK) modulation for a load-insensitive back telemetry system to realize near-constant voltage changes in a primary coil (L-1) against a wide range of load variations. The hybrid-LSK-enabled full-wave rectifier enables the sequential combination of open- and short-coil functions for hybrid-LSK modulation in addition to wireless power conversion operation. Load-insensitive L-1 voltage changes can be demodulated using the proposed slope- based demodulator, which utilizes the threshold slope of L-1 voltage changes over the back data pulse width, enabling robust data recovery regardless of the load conditions. The 0.56-mm(2) 0.18-mu m standard CMOS hybrid-LSK prototype demonstrated that the variation of L-1 voltage changes could be minimized to 60 mV under load changes between 50 omega and 50 k omega at coil separation distance of 10 mm, achieving 88.2% reduction compared to the conventional short-coil LSK with 510 mV variation. The proposed back telemetry system also achieved a bit error rate (BER) of < 9.1 x 10(-10) under load ranges from 50 omega to 50 k omega and data rate of 1 Mbps, ensuring reliable back data recovery against load variations.
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