A 9.03 μW Low Noise Highly Tunable Analog Front-End for Fully Implantable Cochlear Prosthesis

2022-01-01
Ozbek, Berkay
Külah, Haluk
© 2022 IEEE.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 cochlear implants to the best of our knowledge. Although the processing is realized in the analog domain, the system is highly reconfigurable in terms of center frequency, bandwidth and signal amplitude of the channels so that the system becomes compatible with different sensors and maximizes the hearing for each patient. The system was designed in TSMC 180-nm CMOS technology on an active area of 2.4 mm2 and the operation was verified by simulation results.
2022 IEEE Biomedical Circuits and Systems Conference, BioCAS 2022

Suggestions

A Pulse-Width Modulated Cochlear Implant Interface Electronics with 513 mu W Power Consumption
Yigit, Halil Andac; Ulusan, Hasan; Yüksel, Muhammed Berat; Chamanian, Salar; Çiftci, Berkay; Koyuncuoglu, Aziz; Muhtarolu, Ali; Külah, Haluk (2019-01-01)
The fully implantable cochlear implant (FICI) interface circuit proposed in this work senses sound harmonics from 8 different piezoelectric cantilever sensors, and generates pulse width modulated biphasic current outputs to stimulate the auditory neurons. Signals from the piezoelectric sensors are amplified, rectified, and sampled. The sampled voltage is held and converted to current by a novel logarithmic voltage-to-current converter. The current is then digitized with a current comparator to determine the...
A Pulse-Width Modulated Cochlear Implant Interface Electronics with 513 μW Power Consumption
Yigit, Halil Andac; Ulusan, Hasan; Yüksel, Muhammed Berat; Chamanian, Salar; Çiftci, Berkay ; Koyuncuoglu, Aziz; Muhtaroglu, Ali; Külah, Haluk (2019-07-01)
The fully implantable cochlear implant (FICI) interface circuit proposed in this work senses sound harmonics from 8 different piezoelectric cantilever sensors, and generates pulse width modulated biphasic current outputs to stimulate the auditory neurons. Signals from the piezoelectric sensors are amplified, rectified, and sampled. The sampled voltage is held and converted to current by a novel logarithmic voltage-to-current converter. The current is then digitized with a current comparator to determine the...
A Fully-Implantable Mems-Based Autonomous Cochlear Implant
Külah, Haluk; Ulusah, Hasan; Chamanian, Salar; BATU, AYKAN; UĞUR, MEHMET BİROL; Yüksel, Muhammed Berat; Yılmaz, Ali Özgür; YİĞİT, HURŞİT; Koyuncuoglu, Aziz; TOPÇU, ÖZLEM; Soydan, Alper K. (2022-01-01)
© 2022 IEEE.This paper reports a fully implantable, MEMS-based, low-power, energy harvesting, next generation cochlear implant (CI). The implant includes multi-frequency piezoelectric transducers for sound detection and energy harvesting, rectification and signal conditioning electronics, and RF coil for fitting and external powering. These units have outstanding performances: multi-channel transducer can generate 50.7 mVpp (under 100 dB SPL) and recover the daily sound speech signals; signal conditioning I...
A 1-V Nanopower Highly Tunable Biquadratic Gm−C Bandpass Filter for Fully Implantable Cochlear Implants
Özbek, Berkay; Külah, Haluk (2021-12-23)
This paper presents a low power highly tunable second-order Gm−C bandpass filter for auditory signal processing of fully implantable cochlear implants. The resonance frequency of the filter is tunable within the daily acoustic band of 200 - 6000 Hz with a tunable quality factor from 1 to 3. The operational transconductance amplifiers (OTAs) operate in the subthreshold region to achieve low power consumption. The input transistors are driven from the bulk to reduce the transconductance so that the low freque...
A Sub-500 mu W Interface Electronics for Bionic Ears
Ulusan, Hasan; Muhtaroglu, Ali; Külah, Haluk (Institute of Electrical and Electronics Engineers (IEEE), 2019-01-01)
This paper presents an ultra-low power current-mode circuit for a bionic ear interface. Piezoelectric (PZT) sensors at the system input transduce sound vibrations into multi-channel electrical signals, which are then processed by the proposed circuit to stimulate the auditory nerves consistently with the input amplitude level. The sensor outputs are first amplified and range-compressed through ultra-low power logarithmic amplifiers (LAs) into AC current waveforms, which are then rectified through custom cur...
Citation Formats
B. Ozbek and H. Külah, “A 9.03 μW Low Noise Highly Tunable Analog Front-End for Fully Implantable Cochlear Prosthesis,” presented at the 2022 IEEE Biomedical Circuits and Systems Conference, BioCAS 2022, Taipei, Tayvan, 2022, Accessed: 00, 2023. [Online]. Available: https://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=85142923370&origin=inward.