NDLI: Overtone Oscillator for SAW Gas Detectors

Content Provider	IEEE Xplore Digital Library
Author	Pasternak, M.
Copyright Year	2001
Abstract	A design of an overtone oscillator a with surface-acoustic-wave (SAW) resonator is described in this paper. The circuit works stably on the frequency 4.710 GHz (29th harmonic of loaded resonator) at about the -2 dBm level. In the construction, distributed-constant circuits have been applied. Commercially available SAW sensors usually work within the range of frequency from a few dozen to a few hundred megahertz. On the other hand, it is a well-known fact that the mass sensitivity of such devices is directly proportional to the square of its operating frequency, and SAW sensors for organic vapors, for instance, are usually mass sensitive. For this reason, an increase in the SAW sensors' operating frequency seems to be useful. The circuit described in this paper shows the possibility of a dramatic rise in SAW operating frequency by exerting its operation through a specific high overtone (harmonic frequency) of the SAW resonator. The overtone frequency in such a solution then plays the role of basic mode. The oscillator proposed in this paper seems to be a good tool for chemisensitive-SAW-coating investigation
Sponsorship	IEEE Sensors Council
Starting Page	1497
Ending Page	1501
Page Count	5
File Size	387307
File Format	PDF
ISSN	1530437X
Volume Number	6
Issue Number	6
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2006-12-01
Publisher Place	U.S.A.
Access Restriction	One Nation One Subscription (ONOS)
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Oscillators Surface acoustic waves Gas detectors Frequency Chemical sensors Circuits Surface acoustic wave devices Chemical technology Substrates Surface contamination SAW sensors Microwave surface-acoustic-wave (SAW) stabilized oscillators
Content Type	Text
Resource Type	Article
Subject	Instrumentation Electrical and Electronic Engineering

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