Journal
IEEE TRANSACTIONS ON ULTRASONICS FERROELECTRICS AND FREQUENCY CONTROL
Volume 63, Issue 10, Pages 1554-1562Publisher
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/TUFFC.2016.2606655
Keywords
Adaptive matching; implantable medical devices (IMDs); matching network; piezoelectric material; ultrasonic receiver; wireless power transfer
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Funding
- DARPA Young Faculty Award
- National Science Foundation (NSF) CAREER Award [ECCS-1454107]
- NSF [DGE-114747]
- Yansouni Family
- Dr. Robert N. Noyce Stanford Graduate Fellowship
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Miniaturized ultrasonic receivers are designed for efficient powering of implantable medical devices with reconfigurable power loads. Design parameters that affect the efficiency of these receivers under highly variable load conditions, including piezoelectric material, geometry, and operation frequency, are investigated. Measurements were performed to characterize electrical impedance and acoustic-to-electrical efficiency of ultrasonic receivers for off-resonance operation. Finally, we propose, analyze, and demonstrate adaptive matching and frequency tuning techniques using two different reconfigurable matching networks for typical implant loads from 10 mu W to 1 mW. Both simulations and measurements show a significant increase in total implant efficiency (up to 50 percentage points) over this load power range when operating off-resonance with the proposed matching networks.
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