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An analog VLSI cochlea with new transconductance amplifiers and nonlinear gain control

Sarpeshkar, Rahul and Lyon, Richard F. and Mead, Carver A. (1996) An analog VLSI cochlea with new transconductance amplifiers and nonlinear gain control. In: 1996 IEEE International Symposium on Circuits and Systems. ISCAS '96, Connecting the World. Vol.3. IEEE , Piscataway, NJ, pp. 292-296. ISBN 0-7803-3073-0.

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We show data from a working 45-stage analog VLSI cochlea, built on a 2.2 mm×2.2 mm tiny chip. The novel architectural features in this cochlea are: (1) The use of a wide-linear-range low-noise subthreshold transconductance amplifier. (2) The use of “fuse-like” nonlinear positive-feedback amplification in the second-order cochlear filter. Several new circuit techniques used in the design are described here. The fuse nonlinearity shuts off the positive-feedback amplification at large signal levels instead of merely saturating it, like in prior designs, and leads to increased adaptation and improved large-signal stability in the filter. The fuse filter implements a functional model of gain control due to outer hair cells in the biological cochlea. We present data for travelling-wave patterns in our silicon cochlea that reproduce linear and nonlinear effects in the biological cochlea.

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Additional Information:© 1996 IEEE. This work is supported by The Beckman Hearing Center.
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Beckman Hearing CenterUNSPECIFIED
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Deposited On:14 Jan 2015 07:11
Last Modified:10 Nov 2021 20:05

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