Title:
発振装置
Document Type and Number:
Japanese Patent JP7117119
Kind Code:
B2
Abstract:
In an oscillator device that outputs a frequency signal based on an oscillation frequency of a crystal resonator and a frequency setting value, a frequency difference detector that obtains a difference value corresponding to a frequency difference between the output frequency of the oscillator device and an external clock signal and a temperature detector are disposed. An aging coefficient and a temperature characteristic coefficient are obtained based on a secular change of the difference value obtained in the frequency difference detector and a secular change of the detected temperature during a period where the external clock signal is obtained. Furthermore, a frequency correction value is calculated using the aging coefficient and the temperature characteristic coefficient during a holdover period, and the frequency correction value is added to the frequency setting value.
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Inventors:
Furuhata Tsukasa
Application Number:
JP2018058544A
Publication Date:
August 12, 2022
Filing Date:
March 26, 2018
Export Citation:
Assignee:
Nippon Denpa Industry Co., Ltd.
International Classes:
H03L7/14; H03B5/32; H03L1/02
Domestic Patent References:
| JP2017123629A | ||||
| JP2012195932A | ||||
| JP2017153024A |
Foreign References:
| US5881374 |
Attorney, Agent or Firm:
Patent Attorney Corporation Yayoi Patent Office