US 12,308,841 B2
Circuit device and oscillator
Shinnosuke Kano, Minowa (JP)
Assigned to SEIKO EPSON CORPORATION, (JP)
Filed by SEIKO EPSON CORPORATION, Tokyo (JP)
Filed on Nov. 10, 2023, as Appl. No. 18/506,460.
Claims priority of application No. 2022-180838 (JP), filed on Nov. 11, 2022.
Prior Publication US 2024/0162892 A1, May 16, 2024
Int. Cl. H03K 3/03 (2006.01); G01R 19/252 (2006.01); H03M 1/60 (2006.01)
CPC H03K 3/0315 (2013.01) [G01R 19/252 (2013.01); H03M 1/60 (2013.01)] 14 Claims
OG exemplary drawing
 
1. A circuit device comprising:
an oscillation circuit whose oscillation frequency changes according to a supply current;
a current supply circuit configured to selectively supply, to the oscillation circuit, one of a first current that changes according to a detection target voltage and a second current that changes according to a temperature as the supply current;
a counter circuit configured to perform a count process of counting an output signal of the oscillation circuit in a given period; and
a calculation circuit configured to perform a voltage calculation process of calculating detection voltage data corresponding to the detection target voltage based on a first count value obtained in the count process in a state in which the first current is supplied to the oscillation circuit.