$~6~}$ per Channel Analog Biomimetic Cochlear Implant Processor Filterbank Architecture With Across Channels AGC


A new analog cochlear implant processor filterbank design of increased biofidelity, enhanced across-channel contrast and terribly low power consumption has been designed and prototyped. Each channel implements a biomimetic, asymmetric bandpass-like One-Zero-Gammatone-Filter (OZGF) transfer operate, using class-AB log-domain techniques. Every channel's quality factor and suppression are controlled by means of a brand new low power Automatic Gain Control (AGC) scheme which is coupled across the neighboring channels and emulates lateral inhibition (LI) phenomena in the auditory system. Detailed measurements from a five-channel silicon IC prototype fabricated during a zero.35 μm AMS technology ensure the operation of the coupled AGC scheme and its ability to reinforce contrast among channel outputs. The prototype is characterised by an input dynamic range of 92 dB while consuming only 28 μW of power in total ( ~ vi μW per channel) beneath a 1.eight V power supply. The architecture is well-suited for totally-implantable cochlear implants.

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