A multi-channel oscillator for a resonant chemical sensor system

Title
A multi-channel oscillator for a resonant chemical sensor system
Authors
이현주박관규Omer OralkanMario KupnikButrus T. Khuri-Yakub
Keywords
Chemical sensor; CMUT; multi-channel oscillators; humidity detection; Capacitive micromachined ultrasonic transducer
Issue Date
2014-10
Publisher
IEEE transactions on industrial electronics
Citation
VOL 61, NO 10, 5632-5640
Abstract
Vapor detection using highly sensitive miniaturized resonant sensors is of great interest for many applications including consumer, industrial, and environmental applications. An operational-amplifier-based multi-channel oscillator that interfaces with a 50-MHz capacitive micromachined ultrasonic transducer (CMUT) array is presented for chemical sensing applications. The circuit was implemented in a 0.18-μm CMOS technology to reduce power consumption, number of wires, and active area per channel. The presented integrated circuit (IC) also addresses the potential frequency-locking problem between channels by allowing the open-loop gain to be adjustable off-chip. The feasibility of the developed oscillator for the chemical sensing application is demonstrated. Two channels that were operated simultaneously achieved excellent volume sensitivities of 8.5 x 10-4%/Hz and 3.9 x 10-4%/Hz, respectively to relative humidity in N2.
URI
http://pubs.kist.re.kr/handle/201004/47229
ISSN
02780046
Appears in Collections:
KIST Publication > Article
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