The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Dec. 06, 2016
Filed:
Jan. 21, 2016
Seiko Epson Corporation, Tokyo, JP;
Takemi Yonezawa, Minowa-machi, JP;
Tomohiro Uno, Chino, JP;
SEIKO EPSON CORPORATION, Tokyo, JP;
Abstract
An oscillator includes an oscillation element, an oscillation circuit, a heat generation element, a temperature control circuit, and a temperature correction signal generation circuit adapted to generate a temperature correction signal used to correct a frequency-temperature characteristic. The temperature correction signal generation circuit includes a temperature sensor, a first-order correction signal generation circuit adapted to generate a first-order correction signal, and a high-order correction signal generation circuit adapted to generate a high-order correction signal. The high-order correction signal generation circuit includes a high-temperature side second-order correction signal generation circuit, a high-temperature side polarity switching circuit adapted to switch a polarity of a high-temperature side second-order correction signal, a low-temperature side second-order correction signal generation circuit, and a low-temperature side polarity switching circuit adapted to switch a polarity of a low-temperature side second-order correction signal.