Circuit device, oscillator, electronic apparatus, and vehicle
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United States of America Patent
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Jun 9, 2020
Grant Date -
Jun 20, 2019
app pub date -
Dec 14, 2018
filing date -
Dec 15, 2017
priority date (Note) -
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Abstract
A circuit device includes a drive circuit driving a resonator, an oscillation circuit having the resonator and a variable capacitance circuit coupled to an oscillation loop including the drive circuit, and a D/A converter circuit that performs D/A conversion on frequency control data and outputs a first voltage signal and a second voltage signal which are differential signals. The variable capacitance circuit includes a first variable capacitance capacitor, to one end of which the first voltage signal is input and, to the other end of which a first bias voltage is input and a second variable capacitance capacitor, to one end of which the second voltage signal is input and, to the other end of which a second bias voltage is input.
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