US 11,855,646 B2
Circuit device, oscillator, and processing system
Yuichi Toriumi, Minowa-machi (JP)
Assigned to SEIKO EPSON CORPORATION, Tokyo (JP)
Filed by SEIKO EPSON CORPORATION, Tokyo (JP)
Filed on Jul. 28, 2022, as Appl. No. 17/875,882.
Claims priority of application No. 2021-125124 (JP), filed on Jul. 30, 2021.
Prior Publication US 2023/0034239 A1, Feb. 2, 2023
Int. Cl. H03L 1/02 (2006.01)
CPC H03L 1/026 (2013.01) [H03L 1/028 (2013.01)] 12 Claims
OG exemplary drawing
 
1. A circuit device comprising:
an oscillation circuit configured to generate an oscillation signal using a resonator;
a temperature sensor circuit configured to output temperature detection data;
a temperature compensation circuit configured to perform, based on the temperature detection data, temperature compensation on an oscillation frequency of the oscillation signal;
a memory configured to store correction data for correcting the temperature detection data to obtain a temperature, wherein the memory stores a look-up table in which the temperature detection data is associated with frequency adjustment data;
a calculation circuit configured to perform a calculation process of adjusting temperature sensitivity and output, to the look-up table, the temperature detection data subjected to the calculation process; and
an interface circuit configured to output the temperature detection data and the correction data,
wherein the temperature compensation circuit outputs the frequency adjustment data corresponding to the temperature detection data with reference to the look-up table, and the oscillation circuit generates the oscillation signal with the oscillation frequency corresponding to the frequency adjustment data.