Özbek, Abdurrahman Berkay
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.


Charge balanced neural stimulation interface circuit for fully implantable cochlear implants
Yiğit, Halil Andaç; Külah, Haluk; Department of Electrical and Electronics Engineering (2020)
Cochlear implants (CI) are the most successful prosthesis, which helps people suffering from profound deafness; however, aesthetic concerns and daily battery replacement are the main problems. These problems can be solved by a low power fully implantable cochlear implant (FICI). The FICI system should operate with ultra-low power consumption while covering high input dynamic range. Moreover. the system should ensure safe stimulation with single battery usage. In this thesis, a low power FICI interface circu...
Neural stimulation interface with ultra-low power signal conditioning circuit for fully-implantable cochlear implants
Ulusan, Hasan; Chamanian, Salar; Zorlu, Ozge; Muhtaroglu, Ali; Külah, Haluk (2018-03-23)
This paper presents an ultra-low power interface circuit to stimulate auditory nerves through fully-implantable cochlear implants (FICIs). The interface circuit senses signals generated from a multi-frequency piezoelectric sensor array, and generates neural stimulation current according to input sound level. Firstly, piezoelectric sensor output is amplified, and compressed with an ultra-low power logarithmic amplifier (LA). This significantly reduces power by eliminating the compression in the next stages. ...
Single Supply PWM Fully Implantable Cochlear Implant Interface Circuit with Active Charge Balancing
Yigit, H. Andac; Ulusan, Hasan; Koc, Mert; Yüksel, Muhammed Berat; Chamanian, Salar; Külah, Haluk (2021-01-01)
Low powered fully implantable cochlear implants (FICIs) untangle the aesthetic concerns and battery replacement problems of conventional cochlear implants. However, the reported FICIs lack proper charge balancing and require multiple external supplies to operate. In this work, a complete low power FICI interface circuit is designed that operates with a single supply and uses short-pulse-injection method for charge balancing. The system takes input from multi-channel piezoelectric transducers and stimulates ...
Fully Implantable Cochlear Implant Interface Electronics With 51.2-mu W Front-End Circuit
Ulusan, Hasan; Chamanian, Salar; Ilik, Bedirhan; Muhtaroglu, Ali; Külah, Haluk (2019-07-01)
This paper presents an ultralow power interface circuit for a fully implantable cochlear implant (FICI) system that stimulates the auditory nerves inside cochlea. The input sound is detected with a multifrequency piezoelectric (PZT) sensor array, is signal-processed through a front-end circuit module, and is delivered to the nerves through current stimulation in proportion to the sound level. The front-end unit reduces the power dissipation by combining amplification and compression of the sensor output thr...
A 9.03 μW Low Noise Highly Tunable Analog Front-End for Fully Implantable Cochlear Prosthesis
Ozbek, Berkay; Külah, Haluk (2022-01-01)
This paper presents a low noise, low power and highly programmable analog front-end that can interface with an implantable acoustic sensor of a 12-channel fully implantable cochlear implant. Capable of processing outputs from a sensor higher than 20 μVrms as in the speech processors of conventional cochlear implants, the system mimics the filtering in the cochlea with 12 channels (85-6500 Hz) while consuming only 9.03 μW which is one of the lowest power consumption among the analog front-ends for the cochle...
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