Resonance frequency detector and sensing device
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United States of America Patent
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Sep 17, 2024
Grant Date -
Aug 10, 2023
app pub date -
Sep 8, 2022
filing date -
Feb 7, 2022
priority date (Note) -
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Abstract
A resonance frequency detector has an adder that adds a correction term to an oscillation frequency of an output signal of an oscillator, and detects a predetermined resonance frequency of a resonance element. The correction term is generated based on a phase error in a phase locked loop and a degree of change in phase at the resonance frequency, and the phase locked loop generates a control signal based on the phase error between an output signal of the resonance element that resonates at the resonance frequency and the output signal of the oscillator that varies the oscillation frequency according to the control signal.
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