US 12,088,251 B2
Oscillator circuit and temperature compensation method for oscillator circuit
Takayuki Sato, Tokyo (JP); and Takeshi Hamada, Tokyo (JP)
Assigned to Asahi Kasei Microdevices Corporation, Tokyo (JP)
Filed by Asahi Kasei Microdevices Corporation, Tokyo (JP)
Filed on Dec. 25, 2022, as Appl. No. 18/088,608.
Claims priority of application No. 2022-004683 (JP), filed on Jan. 14, 2022.
Prior Publication US 2023/0231519 A1, Jul. 20, 2023
Int. Cl. H03B 5/04 (2006.01); G01K 1/02 (2021.01); G05D 23/19 (2006.01); H03B 5/36 (2006.01)
CPC H03B 5/04 (2013.01) [G01K 1/026 (2013.01); G05D 23/1931 (2013.01); H03B 5/362 (2013.01)] 19 Claims
OG exemplary drawing
 
1. An oscillator circuit that compensates for a frequency variation due to a temperature change in a resonator and a temperature change in an integrated circuit provided in the oscillator circuit, the oscillator circuit comprising:
a first temperature detector, detecting an internal temperature of the oscillator circuit;
a first heater, heating the resonator based on a heater current; and
the integrated circuit,
the integrated circuit further comprising:
a current generator, generating the heater current so that the internal temperature matches a target temperature;
a second heater, heating the integrated circuit based on the heater current;
a second temperature detector, detecting a temperature of the integrated circuit;
a first compensation voltage generation circuit, generating a first compensation voltage for compensating for a first frequency variation due to the temperature change in the integrated circuit, based on a detection result of the second temperature detector;
a second compensation voltage generation circuit, generating a second compensation voltage for compensating for a second frequency variation due to the temperature change in the resonator, based on a detection result of the first temperature detector; and
an oscillator, generating an oscillation signal based on the first compensation voltage and the second compensation voltage.