Neural Stimulation Interface with Ultra-Low Power Signal Conditioning Circuit for Fully-Implantable Cochlear Implants
| Main Authors: | hasan ulusan, salar chamanian, ozge zorlu, ali muhtaroglu, haluk kulah |
|---|---|
| Format: | Proceeding Journal |
| Terbitan: |
, 2017
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| Online Access: |
https://zenodo.org/record/2582714 |
Daftar Isi:
- 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. Then, amplified signal is envelope-detected, and utilized as a reference for stimulation current generation using a voltage controlled current source. Finally, biphasic stimulation current is delivered to the nerves through a switch matrix. The circuit has been designed and fabricated in 180nm high-voltage CMOS technology. 8-channel stimulator dissipates about 667 μW as it generates 110 μA biphasic stimulation current, while the front-end signal conditioning unit dissipates only 51.2 μW.