NDLI: A Charge-Based Low-Power High-SNR Capacitive Sensing Interface Circuit

Content Provider	IEEE Xplore Digital Library
Author	Sheng-Yu Peng Qureshi, M.S. Hasler, P.E. Basu, A. Degertekin, F.L.
Copyright Year	2004
Abstract	This paper describes a low-power approach to capacitive sensing that achieves a high signal-to-noise ratio (SNR). The circuit is composed of a capacitive feedback charge amplifier and a charge adaptation circuit. Without the adaptation circuit, the charge amplifier only consumes 1 muW to achieve the audio band SNR of 69.34 dB. An adaptation scheme using Fowler-Nordheim tunneling and channel hot-electron injection mechanisms to stabilize the dc output voltage is demonstrated. This scheme provides a very low frequency pole at 0.2 Hz. The measured noise spectrums show that this slow-time scale adaptation does not degrade the circuit performance. The dc path can also be provided by a large feedback resistance without causing extra power consumption. A charge amplifier with a MOS-bipolar pseudo-resistor feedback scheme is interfaced with a capacitive micromachined ultrasonic transducer to demonstrate the feasibility of this approach for ultrasound applications.
Sponsorship	IEEE Circuits and Systems Society
Starting Page	1863
Ending Page	1872
Page Count	10
File Size	1531382
File Format	PDF
ISSN	15498328
Volume Number	55
Issue Number	7
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2008-08-01
Publisher Place	U.S.A.
Access Restriction	One Nation One Subscription (ONOS)
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Signal to noise ratio Feedback circuits Tunneling Channel hot electron injection Voltage Electrical resistance measurement Frequency measurement Noise measurement Ultrasonic variables measurement Circuit noise MEMS microphone interface circuit Capacitive circuit capacitive sensing circuit channel hot-electron injection charge amplifier floating-gate circuit Fowler–Nordheim tunneling Capacitive sensing circuit capacitive circuit channel hot electron injection Fowler-Nordheim tunneling
Content Type	Text
Resource Type	Article
Subject	Electrical and Electronic Engineering Hardware and Architecture

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