Title:
基準周波数発生装置
Document Type and Number:
Japanese Patent JP5319790
Kind Code:
B2
Abstract:
To provide a reference frequency generating device that can output a highly accurate reference frequency signal even if a reference signal becomes unable to be acquired. The reference frequency generating device includes a synchronization circuit, a temperature sensor, and a controller. The synchronization circuit controls a reference frequency signal outputted from a voltage controlled oscillator, by a control signal obtained based on a reference signal. The temperature detector detects a temperature of the voltage controlled oscillator being used. When the reference signal is unable to be acquired, the controller corrects a voltage controlled signal in consideration of a distortion in the aging characteristic of the voltage controlled oscillator based on a rate of change with time in a slope of the oscillator temperature, and generates a holdover control signal based on corrected contents to control the voltage controlled oscillator.
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Inventors:
Shinya Owada
Application Number:
JP2011549964A
Publication Date:
October 16, 2013
Filing Date:
January 07, 2011
Export Citation:
Assignee:
FURUNO ELECTRIC COMPANY,LIMITED
International Classes:
H03L7/14; G01S19/14; G01S19/23; H03L1/02; H03L7/093
Domestic Patent References:
| JP2007013878A | 2007-01-18 | |||
| JP2002214323A | 2002-07-31 | |||
| JP2004172831A | 2004-06-17 |
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