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Oscillator circuit configuration for quartz-crystal-resonator sensors subject to heavy acoustic load

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3 Author(s)
V. Ferrari ; Dipt. di Electtronica per l'Autom., Brescia Univ., Italy ; D. Marioli ; A. Taroni

An oscillator circuit configuration is presented to track accurately the resonant frequency and to increase the operating range of quartz-crystal-resonator sensors subject to heavy acoustic loading. The circuit is based on a block for the active cancellation of the crystal electrical capacitance, inserted in a phase-locked loop oscillator. Experimental results confirming the successful application of the principle are reported

Published in:

Electronics Letters  (Volume:36 ,  Issue: 7 )