JPS56169437A - Oscillator - Google Patents

Oscillator

Info

Publication number
JPS56169437A
JPS56169437A JP7257180A JP7257180A JPS56169437A JP S56169437 A JPS56169437 A JP S56169437A JP 7257180 A JP7257180 A JP 7257180A JP 7257180 A JP7257180 A JP 7257180A JP S56169437 A JPS56169437 A JP S56169437A
Authority
JP
Japan
Prior art keywords
voltage controlled
output
controlled oscillator
signal
fed
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
JP7257180A
Other languages
Japanese (ja)
Inventor
Mitsuhiro Iwasako
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Toshiba Corp
Original Assignee
Toshiba Corp
Tokyo Shibaura Electric Co Ltd
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 Toshiba Corp, Tokyo Shibaura Electric Co Ltd filed Critical Toshiba Corp
Priority to JP7257180A priority Critical patent/JPS56169437A/en
Publication of JPS56169437A publication Critical patent/JPS56169437A/en
Pending legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03L—AUTOMATIC CONTROL, STARTING, SYNCHRONISATION OR STABILISATION OF GENERATORS OF ELECTRONIC OSCILLATIONS OR PULSES
    • H03L7/00—Automatic control of frequency or phase; Synchronisation
    • H03L7/06—Automatic control of frequency or phase; Synchronisation using a reference signal applied to a frequency- or phase-locked loop
    • H03L7/16—Indirect frequency synthesis, i.e. generating a desired one of a number of predetermined frequencies using a frequency- or phase-locked loop
    • H03L7/18—Indirect frequency synthesis, i.e. generating a desired one of a number of predetermined frequencies using a frequency- or phase-locked loop using a frequency divider or counter in the loop
    • H03L7/181—Indirect frequency synthesis, i.e. generating a desired one of a number of predetermined frequencies using a frequency- or phase-locked loop using a frequency divider or counter in the loop a numerical count result being used for locking the loop, the counter counting during fixed time intervals

Landscapes

  • Stabilization Of Oscillater, Synchronisation, Frequency Synthesizers (AREA)

Abstract

PURPOSE:To stabilize a voltage controlled oscillating frequency corresponding to the set numeral externally, by counting an output of the voltage controlled oscillator intermittently, comparing this counting value with the set numeral from the outside, converting this compared output into an analog signal and supplying it to the voltage controlled oscillator. CONSTITUTION:An output signal of a voltage controlled oscillator 11 is supplied to one input terminal of an inhibition gate 12. A reference pulse signal Ps is fed to another input terminal of the gate 12, and the output signal of the voltage controlled oscillator 11 can intermittently be picked up at the on-period of the pulse signal Ps. Further, this output signal is frequency-divided to 1/N a counter 13, and this frequency-divided output is fed to a subtractor 14 together with the set numeral M externally supplied at the next on-period of the reference pulse signal Ps to perform the subtraction. As the result of this subtraction, the error signal is fed to a D/A converter 17 at the on-period of the reference pulse signal Ps, and the output of the converter 17 is fed to the voltage controlled oscillator as a control voltage via an LPF18.
JP7257180A 1980-05-30 1980-05-30 Oscillator Pending JPS56169437A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP7257180A JPS56169437A (en) 1980-05-30 1980-05-30 Oscillator

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP7257180A JPS56169437A (en) 1980-05-30 1980-05-30 Oscillator

Publications (1)

Publication Number Publication Date
JPS56169437A true JPS56169437A (en) 1981-12-26

Family

ID=13493185

Family Applications (1)

Application Number Title Priority Date Filing Date
JP7257180A Pending JPS56169437A (en) 1980-05-30 1980-05-30 Oscillator

Country Status (1)

Country Link
JP (1) JPS56169437A (en)

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS54850A (en) * 1977-06-03 1979-01-06 Nec Corp Digital afc circuit

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS54850A (en) * 1977-06-03 1979-01-06 Nec Corp Digital afc circuit

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