US 11,095,250 B2
Circuit device, oscillator, electronic apparatus, and vehicle
Naoki Il, Suwa (JP); Takashi Nomiya, Matsumoto (JP); and Mitsuaki Sawada, Fujimi (JP)
Assigned to Seiko Epson Corporation
Filed by Seiko Epson Corporation, Tokyo (JP)
Filed on Jun. 19, 2020, as Appl. No. 16/906,048.
Claims priority of application No. JP2019-115201 (JP), filed on Jun. 21, 2019.
Prior Publication US 2020/0403570 A1, Dec. 24, 2020
Int. Cl. H03B 5/04 (2006.01); H03B 5/32 (2006.01); H03L 1/02 (2006.01); G01K 7/01 (2006.01)
CPC H03B 5/04 (2013.01) [G01K 7/01 (2013.01); H03B 5/32 (2013.01); H03L 1/028 (2013.01)] 13 Claims
OG exemplary drawing
 
1. A circuit device comprising:
a current generation circuit configured to generate a temperature compensation current based on a temperature detection voltage from a temperature sensor and temperature compensation data; and
a current-voltage conversion circuit configured to convert the temperature compensation current into a temperature compensation voltage, wherein
the current generation circuit performs a fine adjustment of the temperature compensation current based on lower bits of the temperature compensation data, and performs a coarse adjustment of the temperature compensation current based on higher bits of the temperature compensation data,
the current generation circuit includes a high-order function current generation circuit configured to generate a second or higher-order function current based on the temperature detection voltage and high-order correction data of the temperature compensation data, and
the high-order function current generation circuit performs a fine adjustment of the high-order function current based on high-order lower bits as lower bits of the high-order correction data, and performs a coarse adjustment of the high-order function current based on high-order higher bits as higher bits of the high order correction data.