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Cochlear filters design using a parallel dilating-biquads switched-capacitor filter bank

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4 Author(s)
J. Lin ; Maryland Univ., College Park, MD, USA ; W. -H. Ki ; K. Thompson ; S. Shamma

A parallel filter bank is proposed to implement cochlear filters using very-large-time-constant switched-capacitor (SC) biquads. Significant hardware reduction is achieved in three ways. First, the number of biquads is reduced by biquad-sharing such that each channel consists of three biquads in parallel, and a n-channel filter bank requires only n+2 biquads and n sum-gain amplifiers for implementation. Secondly, area-efficient SC biquads are used, and the capacitor spread of each biquad is approximately 1/√Ω0T, where Ω0 is the pole frequency and T is the sampling period. Finally, a lowpass notch biquad is used to avoid a zero at z=-1, which results in a very small capacitor in each biquad. Simulation results for a 32-channel filter bank are given to demonstrate the validity of this design

Published in:

Circuits and Systems, 1992. ISCAS '92. Proceedings., 1992 IEEE International Symposium on  (Volume:4 )

Date of Conference:

3-6 May 1992