Journal ArticleDOI
A low-power wide dynamic range envelope detector
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TLDR
In this article, a 75-dB 2.8-/spl mu/W 100-Hz-10-kHz envelope detector was proposed for low-power bionic implants for the deaf, hearing aids, and speech recognition front-ends.Abstract:
We report a 75-dB 2.8-/spl mu/W 100-Hz-10-kHz envelope detector in a 1.5-/spl mu/m 2.8-V CMOS technology. The envelope detector performs input dc insensitive voltage-to-current converting rectification followed by novel nanopower current-mode peak detection. The use of a subthreshold wide linear range transconductor allows greater than 1.7-V/sub pp/ input voltage swings. We show theoretically that the optimal performance of this circuit is technology independent for the given topology and may be improved only by spending more power due to thermal noise rectification limits. A novel circuit topology is used to perform 140-nW peak detection with controllable attack and release time constants. We demonstrate good agreement of experimentally measured results with theory. The envelope detector is useful in low-power bionic implants for the deaf, hearing aids, and speech-recognition front-ends.read more
Citations
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Journal ArticleDOI
An ultra-low-power programmable analog bionic ear processor
Rahul Sarpeshkar,Christopher Salthouse,Ji-Jon Sit,M.W. Baker,Serhii M. Zhak,Timothy K. Lu,Lorenzo Turicchia,S. Balster +7 more
TL;DR: A programmable analog bionic ear (cochlear implant) processor in a 1.5-/spl mu/m BiCMOS technology with a power consumption that is lower than state-of-the-art analog-to-digital (A/D)-then-DSP designs by a factor of 25 and robust operation of the processor in the high-RF-noise environment typical of cochlear implants systems.
Journal ArticleDOI
A Sub-0.2 $^{\circ}/$ hr Bias Drift Micromechanical Silicon Gyroscope With Automatic CMOS Mode-Matching
TL;DR: The proposed time domain scheme utilizes the often-ignored residual quadrature error in a gyroscope to achieve, and maintain, perfect mode-matching, as well as electronically control the sensor bandwidth.
Journal ArticleDOI
An Ultra-Low-Power Pulse Oximeter Implemented With an Energy-Efficient Transimpedance Amplifier
TL;DR: In this paper, an analog single-chip pulse oximeter with 4.8mW total power dissipation is presented, which is an order of magnitude below the measurements on commercial implementations.
Journal ArticleDOI
Low-Power Circuits for Brain–Machine Interfaces
Rahul Sarpeshkar,Woradorn Wattanapanitch,Scott K. Arfin,Benjamin I. Rapoport,Soumyajit Mandal,M.W. Baker,Michale S. Fee,Sam Musallam,Richard A. Andersen +8 more
TL;DR: This paper presents work on ultra-low-power circuits for brain–machine interfaces with applications for paralysis prosthetics, stroke, Parkinson's disease, epilepsy, prosthetics for the blind, and experimental neuroscience systems.
Proceedings ArticleDOI
An analog bionic ear processor with zero-crossing detection
Rahul Sarpeshkar,M.W. Baker,Christopher Salthouse,Ji-Jon Sit,Lorenzo Turicchia,Serhii M. Zhak +5 more
TL;DR: In this article, a 75 dB 251 /spl mu/W analog speech processor is described that preserves the performance, robustness, and programmability needed for deaf patients at a reduced power consumption compared to that of implementations with A/D and DSP.
References
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Journal ArticleDOI
Log-domain filtering: an approach to current-mode filtering
TL;DR: A novel approach to filter design, based on Adams' ‘log-domain’ filters, is proposed that yields a truly current-mode circuit realisation and, by introducing an exponential map on the state-space description of the desired linear system, a log-domain filter can be fully realised.
Journal ArticleDOI
Translinear circuits: a proposed classification
TL;DR: In this paper, the basic translinear principle is derived and several examples of translinear analogue circuits are given, including the translinear? group, which exploits the precise proportionality of transconductance to collector current in bipolar transistors to result in fundamentally exact, temperature-insensitive behaviour.
Journal ArticleDOI
Mimicking the human ear
TL;DR: The purpose of this article is to present an overview of various signal-processing techniques that have been used for cochlear prosthesis over 25 years.
Journal ArticleDOI
Novel approach to high speed CMOS current comparators
TL;DR: In this article, a novel high speed CMOS integrated current comparator structure is presented which uses a source-follower input stage and a CMOS inverter as a positive feedback.
Journal ArticleDOI
A Low-Power Wide-Linear-Range Transconductance Amplifier
TL;DR: In this paper, a transconductance amplifier designed for low-power (< 1 µW) subthreshold operation with a wide input linear range was presented. But the performance of this amplifier was limited by the fact that the well terminals of the input differential-pair transistors were used as the amplifier inputs.