US 11,863,124 B2
Circuit device and oscillator
Yosuke Itasaka, Minowa (JP); and Takashi Nomiya, Matsumoto (JP)
Assigned to SEIKO EPSON CORPORATION
Filed by SEIKO EPSON CORPORATION, Tokyo (JP)
Filed on Nov. 15, 2022, as Appl. No. 17/986,930.
Claims priority of application No. 2021-186167 (JP), filed on Nov. 16, 2021.
Prior Publication US 2023/0155548 A1, May 18, 2023
Int. Cl. H03B 5/04 (2006.01); H03B 5/36 (2006.01)
CPC H03B 5/04 (2013.01) [H03B 5/366 (2013.01)] 10 Claims
OG exemplary drawing
 
1. A circuit device, comprising:
an oscillation circuit configured to oscillate a resonator;
a temperature compensation circuit configured to output a temperature compensation voltage for temperature compensating an oscillation frequency of the oscillation circuit, based on a temperature detection result of a temperature sensor; and
a frequency control circuit configured to output a frequency control voltage for the oscillation frequency, wherein
the oscillation circuit includes
a first variable capacitance circuit whose capacitance change characteristic with respect to a capacitance control voltage is a positive characteristic, and
a second variable capacitance circuit whose capacitance change characteristic with respect to the capacitance control voltage is a negative characteristic,
the temperature compensation circuit supplies the temperature compensation voltage as the capacitance control voltage to the first variable capacitance circuit, and
the frequency control circuit supplies the frequency control voltage as the capacitance control voltage to the second variable capacitance circuit.