A Pulse-Width Modulated Cochlear Implant Interface Electronics with 513 mu W Power Consumption

Date

2019-01-01

Author

Yigit, Halil Andac
Ulusan, Hasan
Yüksel, Muhammed Berat
Chamanian, Salar
Çiftci, Berkay
Koyuncuoglu, Aziz
Muhtarolu, Ali
Külah, Haluk

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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 width of the generated biphasic current pulses. Continuous interleaved sampling (CIS) is used as the stimulation technique for 8 channels operation. The system is designed and implemented in 0.18 am HV CMOS process. Measurements show that the circuit is able to generate 15 to 62.5 mu s biphasic current pulses with 400 mu A peak amplitude, as the input range varies from 60 dB to 105 dB sound pressure level. The total power consumption of 82 and 513 mu W have been measured at 70 dB input for 1-channel and have been extrapolated for 8-channels configurations, respectively, which are the lowest powers for FICI interface electronics to the best of our knowledge.

Subject Keywords

Fully Implantable Cochlear Implant, Neural Stimulation

URI

https://hdl.handle.net/11511/99291

Conference Name

IEEE/ACM International Symposium on Low Power Electronics and Design (ISLPED)

Collections

Department of Electrical and Electronics Engineering, Conference / Seminar

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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...
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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. ...
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 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...

Citation Formats

H. A. Yigit et al., “A Pulse-Width Modulated Cochlear Implant Interface Electronics with 513 mu W Power Consumption,” presented at the IEEE/ACM International Symposium on Low Power Electronics and Design (ISLPED), Lausanne, İsviçre, 2019, Accessed: 00, 2022. [Online]. Available: https://hdl.handle.net/11511/99291.