Wirelessly Powered and Bi-Directional Data Communication System With Adaptive Conversion Chain for Multisite Biomedical Implants Over Single Inductive Link

A wirelessly powered and data communication system is presented which is implemented as a full system, designed for multisite implanted biomedical applications. The system is capable of receiving wireless power and data communication for each implant separately, using inductive links with different...

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Bibliographic Details
Published in:IEEE transactions on biomedical circuits and systems 2024-06, Vol.18 (3), p.636-647
Main Authors: Karimi, Mohammad Javad, Jin, Menghe, Zhou, Yuxuan, Dehollain, Catherine, Schmid, Alexandre
Format: Article
Language:English
Subjects:
Active rectifier
Adaptive systems
Amplitude shift keying
amplitude shift keying (ASK) demodulator
Biomedical materials
Chains
Closed loops
Coils
Communications systems
Coupling coefficients
Data communication
Data conversion
Data transfer
Demodulation
Demodulators
Electric Power Supplies
Energy dissipation
Equipment Design
Humans
Implants
multisite implants
Power control
Prostheses and Implants
Rectifiers
Resonance
resonance tuning
Signal Processing, Computer-Assisted - instrumentation
Surgical implants
Transplants & implants
Uplink
voltage regulation
wireless power and data transfer (WPDT)
Wireless power transfer
Wireless power transmission
Wireless Technology - instrumentation
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Summary:A wirelessly powered and data communication system is presented which is implemented as a full system, designed for multisite implanted biomedical applications. The system is capable of receiving wireless power and data communication for each implant separately, using inductive links with different resonance frequencies. To achieve this, dual-band coils are presented in the system. In addition, the system supports bi-directional half-duplex data communication, utilizing amplitude and load shift keying (ASK and LSK) modulation schemes over a single inductive link. The system employs a digitally assisted active rectifier and an automatic resonance tuning system, to improve the power transfer efficiency (PTE) through various coupling coefficients, while minimizing the reverse current and power dissipation. The power control unit enables closed-loop monitoring to prevent high or low power delivery, and it can detect inefficient or excessive wireless power transmission or prevent temperature elevation by limiting the voltage to a safe level. A new structure of self-sampling separated-V_{b} ASK demodulator is proposed in the paper which is utilized within the data conversion chain, serving both the external and implanted units. The whole system is fabricated using a standard 180-nm 1.8/3.3 V CMOS process with a core area of 0.82 mm^\text{2}. The system is tested with coupled multisite inductive links and offers the maximum overall PTE of 31.2%, from the Tx coil to the implant load.
ISSN:1932-4545
1940-9990
DOI:10.1109/TBCAS.2024.3359772