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Title:
OSCILLATING DEVICE
Document Type and Number:
WIPO Patent Application WO/2019/188990
Kind Code:
A1
Abstract:
[Problem] To provide a technique, with respect to an oscillating device that uses a crystal oscillator and stabilizes an oscillating frequency on the basis of an external clock signal, for stabilizing the oscillating frequency that is output even when the external clock is interrupted. [Solution] An oscillating device which outputs a frequency signal on the basis of an oscillating frequency of a crystal oscillator 10 and a frequency setting value and is provided with: a frequency difference detection unit 207 for determining a difference value corresponding to a frequency difference between an output frequency of the oscillating device and an external clock signal; and a temperature detection unit. During a period in which the external clock signal is being acquired, an aging coefficient (a1) and a temperature characteristic coefficient (a2) are determined on the basis of a change over time of the difference value determined by the frequency difference detection unit 207, and a change over time of a detected temperature. Further, during a hold-over period, a frequency correction value is calculated using the aging coefficient (a1) and the temperature characteristic coefficient (a2), and is added to the frequency setting value.

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Inventors:
KOBATA, Tsukasa (LTD. / Sayama Plant 1275-2Oaza Kamihiros, Sayama-shi Saitama 21, 〒3501321, JP)
Application Number:
JP2019/012521
Publication Date:
October 03, 2019
Filing Date:
March 25, 2019
Export Citation:
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Assignee:
NIHON DEMPA KOGYO CO., LTD. (1-47-1, Sasazuka Shibuya-k, Tokyo 69, 〒1518569, JP)
International Classes:
H03L1/02; H03L7/14
Foreign References:
JP2017123629A2017-07-13
JP2012195932A2012-10-11
JP2017153024A2017-08-31
US5881374A1999-03-09
Attorney, Agent or Firm:
YAYOY PATENT OFFICE (601 Storktower Odori-Park 3, 2-15-1 Yayoicho, Naka-ku, Yokohama-sh, Kanagawa 58, 〒2310058, JP)
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