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A 32-Site 4-Channel High-Density Electrode Array for a Cochlear Prosthesis

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2 Author(s)
Bhatti, P.T. ; Michigan Univ., Ann Arbor, MI ; Wise, K.D.

This paper describes a 32-site 4-channel high-density intracochlear electrode array. Combining MEMS-based processing technology with active circuitry, the thin-film device realizes a stimulating site density three times that of commercial systems, delivering 500 muA biphasic current levels with 8-bit resolution and less than 1% charge mismatch. The minimum pulsewidth is 4 mus, and the per-channel power dissipation is 2.5 mW from plusmn2.5 V. The active circuit chip has a footprint of 2.4mmtimes2.9 mm. Serving as the end-effector of a cochlear prosthesis, the active array also provides site-impedance measurement and position-sensing functions

Published in:

Solid-State Circuits, IEEE Journal of  (Volume:41 ,  Issue: 12 )