A Multichannel Oscillator for a Resonant Chemical Sensor System | IEEE Journals & Magazine | IEEE Xplore

A Multichannel Oscillator for a Resonant Chemical Sensor System


Abstract:

Vapor detection using highly sensitive miniaturized resonant sensors is of great interest for many applications, including consumer, industrial, and environmental applica...Show More

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 multichannel oscillator that interfaces with a 50-MHz capacitive micromachined ultrasonic transducer 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 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 × 10-4%/Hz and 3.9 × 10-4%/Hz, respectively, to relative humidity in N2.
Published in: IEEE Transactions on Industrial Electronics ( Volume: 61, Issue: 10, October 2014)
Page(s): 5632 - 5640
Date of Publication: 14 January 2014

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