JPS6351723A - Oscillation circuit - Google Patents

Oscillation circuit

Info

Publication number
JPS6351723A
JPS6351723A JP61195823A JP19582386A JPS6351723A JP S6351723 A JPS6351723 A JP S6351723A JP 61195823 A JP61195823 A JP 61195823A JP 19582386 A JP19582386 A JP 19582386A JP S6351723 A JPS6351723 A JP S6351723A
Authority
JP
Japan
Prior art keywords
alarm
signal
oscillation
frequency
filtering
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
JP61195823A
Other languages
Japanese (ja)
Inventor
Toshiaki Arai
Original Assignee
Nec Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Nec Corp filed Critical Nec Corp
Priority to JP61195823A priority Critical patent/JPS6351723A/en
Publication of JPS6351723A publication Critical patent/JPS6351723A/en
Pending legal-status Critical Current

Links

Abstract

PURPOSE: To surely detect the change of an output frequency based on the change of the oscillation frequency of a high accurate oscillation part set as reference, and to generate an alarm, by providing a filtering part, and an alarm detecting part.
CONSTITUTION: A voltage controlled oscillation part 1 controls a signal at the oscillation frequency fo corresponding to the controlled voltage of a control part 7, and branches it to a prescribed number of signals at a branching part 2, and supplies them to a comparison part 6 after stepping down them at a step-down part 4, and compares the signal of the high accurate oscillation part 5 set as the reference, and that of the step-down part 4, and outputs an error signal to the control part 7. The control part 7 outputs the controlled voltage to a voltage controlled oscillation part 1, and the alarm detecting part 8 based on the error signal, and when the value of the controlled voltage drops below a threshold value, it detects the alarm, and outputs an alarm signal through a terminal 9. The filtering part 10 passes only the signal of frequency fo, and the alarm detecting part 11 sets a prescribed threshold value in advance, and only when the output value of the filtering part 10 drops below the threshold value, it detects the alarm, and sends out the alarm signal through a terminal 12.
COPYRIGHT: (C)1988,JPO&Japio
JP61195823A 1986-08-21 1986-08-21 Oscillation circuit Pending JPS6351723A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP61195823A JPS6351723A (en) 1986-08-21 1986-08-21 Oscillation circuit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP61195823A JPS6351723A (en) 1986-08-21 1986-08-21 Oscillation circuit

Publications (1)

Publication Number Publication Date
JPS6351723A true JPS6351723A (en) 1988-03-04

Family

ID=16347592

Family Applications (1)

Application Number Title Priority Date Filing Date
JP61195823A Pending JPS6351723A (en) 1986-08-21 1986-08-21 Oscillation circuit

Country Status (1)

Country Link
JP (1) JPS6351723A (en)

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