Drive circuit, physical quantity sensor, and electronic device
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United States of America Patent
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Nov 24, 2020
Grant Date -
Feb 8, 2018
app pub date -
Apr 11, 2016
filing date -
Apr 13, 2015
priority date (Note) -
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status (Latency Note)
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Abstract
A drive circuit is configured to drive an oscillator to vibrate the oscillator that outputs a monitor signal according to a physical quantity. The drive circuit includes a drive signal generating unit that generates a drive signal having a drive frequency, a phase difference detector that detects a phase difference between the monitor signal and the drive signal, a frequency controller that controls the drive frequency based on the phase difference, automatic gain control (AGC) unit that controls an amplitude of the drive signal according to an amplitude of the monitor signal, and an output unit that outputs the drive signal having the controlled amplitude to the oscillator. This drive circuit can stably drive and vibrate the oscillator.
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