Magnet Free Inductive Wireless Power and Data Transmission System For Fully Implantable Cochlear Implants

Date

2024-8-5

Author

Doğan, Mert
Türkyılmaz, Ayşe Beyhan
Engür, Yasemin
Külah, Haluk

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This work is licensed under a Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License.

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In this work, a wireless power and data transmission system (WPDT) for fully implantable cochlear implants that operates with a broad range of input power is implemented. In this inductive link, power conversion efficiency is maximized by switching the operation modes of the multi-mode rectifier according to the power sourcing capability under varying coupling conditions. These operation modes are named as half wave mode (HWM) and voltage mode (VM). While the input power of the transmitter is generated with a Class-E power amplifier, data transmission is conducted with differential binary phase shift keying. A large gain common gate amplifier is utilized to compensate variable input signal level. Data and carrier recovery is realized by an asymmetric charge-discharge structure with threshold detection. This novel WPDT circuit is implemented and fabricated in TSMC 180 nm BCD Technology with an active area of 1.2 mm2. Average charging power values of the system for a 3.3 V load are measured as 42.96 mW, 38.90 mW, and 60.10 mW for only HWM, only VM, and mixed mode rectification for a transmitted power range of 10 - 140 mW. Meanwhile, BPSK demodulator consumes only 22.8 - 24.1 μW power and has a bit error rate (BER) range of 3.0x 10-3 - 2.8 x 10-6 depending on receiver coil voltage level (50 - 300 mV).

Subject Keywords

binary phase shift keying, fully implantable cochlear implant, inductive coupling, medical implant, multi-mode rectification, non-coherent detection, wireless power and data transmission

URI

https://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=85204954536&origin=inward
https://hdl.handle.net/11511/112417

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Department of Electrical and Electronics Engineering, Conference / Seminar