US 12,244,268 B2
Circuit device and oscillator
Takashi Nomiya, Matsumoto (JP); and Mitsuaki Sawada, Fujimi (JP)
Assigned to SEIKO EPSON CORPORATION, (JP)
Filed by SEIKO EPSON CORPORATION, Tokyo (JP)
Filed on Feb. 27, 2023, as Appl. No. 18/114,322.
Claims priority of application No. 2022-029256 (JP), filed on Feb. 28, 2022.
Prior Publication US 2023/0275546 A1, Aug. 31, 2023
Int. Cl. H03B 5/04 (2006.01); H03B 5/32 (2006.01)
CPC H03B 5/04 (2013.01) [H03B 5/32 (2013.01); H03B 2200/0088 (2013.01)] 13 Claims
OG exemplary drawing
 
1. A circuit device comprising:
an oscillation circuit configured to generate an oscillation signal; and
a temperature compensation circuit configured to perform temperature compensation for an oscillation frequency of the oscillation signal, the temperature compensation circuit including:
a first reference current generation circuit configured to generate a first reference current;
a second reference current generation circuit configured to generate a second reference current;
a first compensation circuit configured to perform the temperature compensation for the oscillation frequency in a first temperature range based on the first reference current; and
a second compensation circuit configured to perform the temperature compensation for the oscillation frequency in a second temperature range, which is higher than the first temperature range in temperature, based on the second reference current, wherein
the first reference current generation circuit is configured to reduce the first reference current as a temperature rises, or the second reference current generation circuit is configured to reduce the second reference current as the temperature drops, and
the second temperature range is larger than the first temperature range.