LOW POWER HIGHLY PROGRAMMABLE ANALOG FRONT-END FOR 12-CHANNEL FULLY IMPLANTABLE COCHLEAR IMPLANTS

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Berkay Özbek Tez Final 3.pdf

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2021-12-17

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Özbek, Abdurrahman Berkay

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Cochlear implants are the most common treatment option for individuals with sensorineural hearing loss. However, despite the functional success, the patients have concerns about the aesthetics and practicality of the device. Fully implantable cochlear implants (FICI), on the other hand, have a promising future to overcome these drawbacks by replacing the external components with an acoustic sensor and interface electronics. To achieve a high quality of hearing, the interface electronics should effectively decompose sound waves captured by the acoustic sensor into the frequency components while providing controllability of system parameters for personalized treatment and achieving low power consumption for the extension of battery life. In this thesis, a low-power low-noise highly-programmable analog front-end circuit has been designed to interface with the acoustic sensor of a 12-channel FICI. First, a low-power highly-tunable biquadratic Gm-C bandpass filter has been designed and implemented as a part of the analog front-end. The center frequency and quality factor of the filter can be programmed between 200-6000 Hz and 1-3, respectively while consuming only 13.2 nW at 950 Hz. The filter achieved one of the best figure-of-merit compared to the analog bandpass filters in the literature. Next, a complete analog front-end circuit to interface with the acoustic sensor of a 12-channel FICI system has been designed. The system can cover 85-6500 Hz and filter sound by 12 channels while providing channel-specific programmability for better speech perception and consuming only 9.03 μW which is about 1.3% of the overall power consumption of the 12-channel FICI circuit.

Subject Keywords

Fully Implantable Cochlear Implants, Analog Front-End, Auditory Signal Processing, Low-Power Biomedical Integrated Circuits

URI

https://hdl.handle.net/11511/95464

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Graduate School of Natural and Applied Sciences, Thesis

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Citation Formats

A. B. Özbek, “LOW POWER HIGHLY PROGRAMMABLE ANALOG FRONT-END FOR 12-CHANNEL FULLY IMPLANTABLE COCHLEAR IMPLANTS,” M.S. - Master of Science, Middle East Technical University, 2021.