Back to Search
Start Over
A Load-Insensitive Hybrid LSK Back Telemetry System With Slope-Based Demodulation for Inductively Powered Biomedical Devices.
- Source :
- IEEE Transactions on Biomedical Circuits & Systems; Aug2022, Vol. 16 Issue 4, p651-663, 13p
- Publication Year :
- 2022
-
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 (L1) 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 L1 voltage changes can be demodulated using the proposed slope- based demodulator, which utilizes the threshold slope of L1 voltage changes over the back data pulse width, enabling robust data recovery regardless of the load conditions. The 0.56-mm2 0.18-μm standard CMOS hybrid-LSK prototype demonstrated that the variation of L1 voltage changes could be minimized to 60 mV under load changes between 50 Ω and 50 kΩ 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 × 10−10 under load ranges from 50 Ω to 50 kΩ and data rate of 1 Mbps, ensuring reliable back data recovery against load variations. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 19324545
- Volume :
- 16
- Issue :
- 4
- Database :
- Complementary Index
- Journal :
- IEEE Transactions on Biomedical Circuits & Systems
- Publication Type :
- Academic Journal
- Accession number :
- 160689567
- Full Text :
- https://doi.org/10.1109/TBCAS.2022.3192248