US 11,791,770 B2
Circuit device and oscillator
Teppei Higuchi, Chino (JP); Jun Uehara, Fujimi-machi (JP); Yuichi Toriumi, Minowa-machi (JP); and Hiroshi Kiya, Suwa (JP)
Assigned to SEIKO EPSON CORPORATION, Tokyo (JP)
Filed by SEIKO EPSON CORPORATION, Tokyo (JP)
Filed on Jul. 13, 2022, as Appl. No. 17/863,714.
Claims priority of application No. 2021-116865 (JP), filed on Jul. 15, 2021.
Prior Publication US 2023/0020823 A1, Jan. 19, 2023
Int. Cl. H03B 5/04 (2006.01); H03B 5/36 (2006.01)
CPC H03B 5/04 (2013.01) [H03B 5/36 (2013.01)] 9 Claims
OG exemplary drawing
 
1. A circuit device comprising:
a first terminal;
a first oscillation circuit oscillating a resonator and generating a first voltage for automatic gain control for controlling amplitude of a signal output from the resonator;
a digital signal generation circuit generating a digital signal corresponding to the first voltage; and
a first interface circuit outputting the digital signal to the first terminal,
wherein
the digital signal generation circuit includes:
a second oscillation circuit having an oscillation frequency changing according to the first voltage; and
a counter performing count operation based on an output signal of the second oscillation circuit.