US 12,218,630 B2
Oscillator
Kentaro Seo, Shiojiri (JP)
Assigned to SEIKO EPSON CORPORATION, (JP)
Filed by SEIKO EPSON CORPORATION, Tokyo (JP)
Filed on Feb. 20, 2023, as Appl. No. 18/171,402.
Claims priority of application No. 2022-024534 (JP), filed on Feb. 21, 2022.
Prior Publication US 2023/0268883 A1, Aug. 24, 2023
Int. Cl. H03B 5/04 (2006.01); H03B 5/32 (2006.01); H03B 5/36 (2006.01); H03K 5/24 (2006.01); H03L 1/02 (2006.01); H03L 5/00 (2006.01)
CPC H03B 5/04 (2013.01) [H03B 5/326 (2013.01); H03B 5/36 (2013.01); H03K 5/24 (2013.01); H03L 1/022 (2013.01); H03L 1/028 (2013.01); H03L 5/00 (2013.01); H03B 2200/0018 (2013.01)] 7 Claims
OG exemplary drawing
 
1. An oscillator comprising:
a resonator element;
an oscillation circuit configured to oscillate the resonator element to generate a clock signal;
a temperature sensor;
a digital control circuit configured to operate based on the clock signal and output a control signal based on a temperature detected by the temperature sensor;
a temperature control circuit configured to output a control voltage based on the control signal;
a temperature control element configured to control a temperature of the resonator element based on the control voltage; and
a clock signal abnormality detection circuit configured to detect an abnormality in the clock signal, wherein
the clock signal abnormality detection circuit stops an output of the control voltage to the temperature control element performed by the temperature control circuit when the abnormality in the clock signal is detected.