DMCA
This article has been accepted for inclusion in a future issue of this journal. Content is final as presented, with the exception of pagination. IEEE TRANSACTIONS ON BIOMEDICAL CIRCUITS AND SYSTEMS 1 A Bio-Realistic Analog CMOS Cochlea Filter With
BibTeX
@MISC{Tunability_thisarticle,
author = {High Tunability and Ultra-steep Roll-off and Shiwei Wang and Student Member and Thomas Jacob Koickal and Alister Hamilton and Rebecca Cheung and Senior Member and Leslie S. Smith and Senior Member},
title = {This article has been accepted for inclusion in a future issue of this journal. Content is final as presented, with the exception of pagination. IEEE TRANSACTIONS ON BIOMEDICAL CIRCUITS AND SYSTEMS 1 A Bio-Realistic Analog CMOS Cochlea Filter With},
year = {}
}
Share
 |
 |
 |
 |
||
OpenURL
Abstract
Abstract—This paper presents the design and experimental results of a cochlea filter in analog very large scale integration (VLSI) which highly resembles physiologically measured response of the mammalian cochlea. The filter consists of three specialized sub-filter stages which respectively provide passive response in low frequencies, actively tunable response in mid-band frequencies and ultra-steep roll-off at transition frequencies from pass-band to stop-band. The sub-filters are implemented in balanced ladder topology using floating active inductors. Measured results from the fabricated chip show that wide range of mid-band tuning including gain tuning of over 20dB, Q factor tuning from 2 to 19 as well as the bio-realistic center frequency shift are achieved by adjusting only one circuit parameter. Besides, the filter has an ultra-steep roll-off reaching over 300 dB/dec. By changing biasing currents, the filter can be configured to operate with center fre-quencies from 31 Hz to 8 kHz. The filter is order, consumes power and occupies chip area. A parallel bank of the proposed filter can be used as the front-end in hearing prosthesis devices, speech processors as well as other bio-inspired auditory systems owing to its bio-realistic behavior, low power consumption and small size. Index Terms—AnalogVLSI, auditory filter, bio-inspired circuits, CMOS cochlea, floating active inductor. I.
Keyphrases
bio-realistic analog cmos cochlea filter ieee transaction biomedical circuit system future issue active inductor bio-realistic center frequency shift low frequency parallel bank gain tuning mid-band frequency chip show wide range occupies chip area cmos cochlea large scale integration balanced ladder topology circuit parameter center fre-quencies db dec specialized sub-filter stage auditory filter low power consumption prosthesis device bio-realistic behavior passive response bio-inspired circuit cochlea filter ultra-steep roll-off transition frequency bio-inspired auditory system tunable response speech processor mammalian cochlea ultra-steep roll-off reaching index term analogvlsi experimental result small size
