A 32-mu W 1.83-kS/s Carbon Nanotube Chemical Sensor System
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Cho-2009-A 32-mu W 1.83-kS_s.pdf
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Author(s)
Cho, Taeg Sang
Lee, Kyeong-Jae
Kong, Jing
Chandrakasan, Anantha P.
Date Issued
January 2009
Journal
IEEE Journal of Solid-State Circuits
Publisher
Institute of Electrical and Electronics Engineers
Citation
Taeg Sang Cho et al. “A 32- \mu W 1.83-kS/s Carbon Nanotube Chemical Sensor System.” Solid-State Circuits, IEEE Journal of 44.2 (2009): 659-669. © 2009 Institute of Electrical and Electronics Engineers
Version
Final published version
Abstract
This paper presents an energy-efficient chemical sensor system that uses carbon nanotubes (CNT) as the sensing medium. The room-temperature operation of CNT sensors eliminates the need for micro hot-plate arrays, which enables the low energy operation of the system. An array of redundant CNT sensors overcomes the reliability issues incurred by the CNT process variation. The sensor interface chip is designed to accommodate a 16-bit dynamic range by adaptively controlling an 8-bit DAC and a 10-bit ADC. A discrete optimization methodology determines the dynamic range of the DAC and the ADC to minimize the energy consumption of the system. A simple calibration technique using off-chip reference resistors reduces the DAC non-linearity. The sensor interface chip is designed in a 0.18-mum CMOS process and consumes, at maximum, 32 muW at 1.83 kS/s conversion rate. The designed interface achieves 1.34% measurement accuracy across the 10 kOmega-9 MOmega range. The functionality of the full system, including CNT sensors, has been successfully demonstrated.
Subjects
carbon nanotube (CNT)
chemical sensor system
low power
sensor interface
MIT Department
Massachusetts Institute of Technology. Department of Electrical Engineering and Computer Science
Massachusetts Institute of Technology. Microsystems Technology Laboratories
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Article is made available in accordance with the publisher’s policy and may be subject to US copyright law. Please refer to the publisher’s site for terms of use.
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DOI of Published Version
http://dx.doi.org/10.1109/jssc.2008.2010805
