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

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

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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 phaselocked loop oscillator. Experimental results confirming the successful application of the principle are reported.


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