Oscillation circuit and oscillation-circuit driving method
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United States of America Patent
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Oct 29, 2019
Grant Date -
Jun 15, 2017
app pub date -
Feb 27, 2017
filing date -
Aug 29, 2014
priority date (Note) -
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Abstract
An oscillation circuits that provides stable oscillations even when the amount of phase rotation of a piezoelectric resonator is small or fluctuates. The oscillation circuit includes a first amplifier having an input and an output, and a piezoelectric resonator connected between the input and the output of the first amplifier. Moreover, the oscillation circuit feeds, back to the input, a current flowing from the output of the first amplifier to the piezoelectric resonator. The oscillation circuit further includes an alternating-voltage waveform shaping circuit that applies, to the piezoelectric resonator, an alternating-voltage waveform having rising portions sharper than those of a sine wave.
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