Oscillation circuit, oscillator, communication device, and method of controlling oscillation circuit
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United States of America Patent
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Jun 22, 2021
Grant Date -
Dec 31, 2020
app pub date -
Jun 24, 2020
filing date -
Jun 25, 2019
priority date (Note) -
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Abstract
An oscillation circuit includes a first oscillation circuit configured to oscillate a resonator to generate a first oscillation signal, a second oscillation circuit configured to generate a second oscillation signal, a frequency measurement circuit configured to measure a frequency of the second oscillation signal based on the first oscillation signal in a first period in which the first oscillation circuit is in operation, a holding circuit configured to hold a measurement result by the frequency measurement circuit in a second period in which the first oscillation circuit is not in operation, and an oscillation signal generation circuit configured to generate a third oscillation signal based on the second oscillation signal and the measurement result held in the holding circuit in a third period in which the first oscillation circuit starts up, wherein the third oscillation signal is supplied to the first oscillation circuit in the third period.
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