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Power-efficient sensor interface circuits / by Dingkun Du.

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Author	Du, Dingkun.
Title	Power-efficient sensor interface circuits / by Dingkun Du.
Date	2013
Abstract	There is a growing demand for power-constrained sensors in many areas, particularly in emerging healthcare and next-generation biomedical applications. Such sensors have very limited power budget, among which interface circuits, including analog front ends (AFEs) and analog-to-digital converters (ADCs), usually consume a significant portion of the limited power budget. Therefore, my research is to develop power-efficient sensor interface circuits, specifically for audio applications. To improve power efficiency, a bandwidth-adaptive method is proposed to make circuits adapt their power consumption according to the input signal's bandwidth, so that their power efficiency will be improved. A bandwidth-adaptive microphone preamplifier (i.e., an AFE) for general voice coding is designed. According to measurement results based on a 0.5-[mu]m complementary metal-oxide-semiconductor (CMOS) process, the preamplifier maintains a virtually constant dynamic range of 89 dB regardless of the bandwidth adaptation. Also, a perceptual speech quality test shows that speech quality is not corrupted for 50% power saving, as compared to its fixed counterpart whose bandwidth is always held at maximum. Furthermore. a complete bandwidth-adaptive sensor interface (including an AFE and an ADC) for computer audition is designed. Fabricated in a 0.35-[mu]m CMOS process, measurement results of the interface show that its AFE has a signal-to-noise ratio (SNR) of 62 dB and its ADC has an effective number of bits (ENOB) of 9.0, and these specifications are not corrupted with the bandwidth adaptation. Applying it to two computer auditory applications, including speaker identification and cough detection, the adaptive sensor interface shows better or similar performance with significantly less power consumption (> 50% power saving), as compared to its fixed counterpart. In the bandwidth-adaptive sensor interface circuits, a critical building block that enables efficient bandwidth extraction is a spike encoding circuit, which directly encodes i
Description	xiv, 151 leaves : ill. (some col.) 28 cm.
Format	application/pdf
Advisor	Kofi Odame, Paul Ferguson, Sheng-Yu Peng, Jason Stauth, Charles Sullivan
College	Thayer School of Engineering.
Issuing Body	Dartmouth Dissertations are made available through the Dartmouth Digital Library.
Degree	Thesis (Ph.D.)--Dartmouth College.
Copyright	All rights reserved. No part of this book may be reproduced in any form by any electronic or mechanical means without permission in writing from the author.
DOI	http://dx.doi.org/10.1349/ddlp.955

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Power-efficient sensor interface circuits / by Dingkun Du.

Power-efficient sensor interface circuits / by Dingkun Du.