US 12,273,071 B2
Circuit device and oscillator
Teppei Higuchi, Chino (JP); Sho Matsuzaki, Ina (JP); Yuichi Toriumi, Minowa (JP); and Toshiya Usuda, Ina (JP)
Assigned to SEIKO EPSON CORPORATION, (JP)
Filed by SEIKO EPSON CORPORATION, Tokyo (JP)
Filed on Mar. 27, 2024, as Appl. No. 18/617,695.
Claims priority of application No. 2023-051090 (JP), filed on Mar. 28, 2023.
Prior Publication US 2024/0333215 A1, Oct. 3, 2024
Int. Cl. H03B 5/36 (2006.01); H03H 9/10 (2006.01); H03H 9/25 (2006.01)
CPC H03B 5/364 (2013.01) [H03H 9/1064 (2013.01); H03H 9/25 (2013.01)] 8 Claims
OG exemplary drawing
 
1. A circuit device comprising:
a first terminal and a second terminal coupled to a resonator;
an amplifier circuit configured to amplify a signal from the first terminal and output the amplified signal to the second terminal;
a variable resistance circuit that is provided on a signal path between the amplifier circuit and the second terminal and includes a variable resistor, a first switch provided at one end of the variable resistor, and a second switch provided at the other end of the variable resistor;
a third switch coupled in parallel to the variable resistance circuit; and
a control circuit configured to control a resistance value of the variable resistor and control the first switch, the second switch, and the third switch to be turned on or off.