JPS5636234A - Frequency following type voltage control oscillating unit - Google Patents

Frequency following type voltage control oscillating unit

Info

Publication number
JPS5636234A
JPS5636234A JP11188679A JP11188679A JPS5636234A JP S5636234 A JPS5636234 A JP S5636234A JP 11188679 A JP11188679 A JP 11188679A JP 11188679 A JP11188679 A JP 11188679A JP S5636234 A JPS5636234 A JP S5636234A
Authority
JP
Japan
Prior art keywords
vco
circuit
counter
frequency
output
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
JP11188679A
Other languages
Japanese (ja)
Inventor
Masahiro Yanagi
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.)
Panasonic Holdings Corp
Original Assignee
Matsushita Electric Industrial 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 Matsushita Electric Industrial Co Ltd filed Critical Matsushita Electric Industrial Co Ltd
Priority to JP11188679A priority Critical patent/JPS5636234A/en
Publication of JPS5636234A publication Critical patent/JPS5636234A/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 obtain a set frequency with a high precision in a short sweep time, by monitoring the output frequency of a VCO and by controlling the input voltage of the VCO so that the output frequency may agree with the set frequency. CONSTITUTION:By lock CK1 from clock pulse generating circuit 2, gate circuit 3 applies the output signal of VCO 1 to counter 4. By clock CK3 from circuit 2, contents of counter 4 are held in latch circuit 5. Contents of latch circuit 5 and set frequency f2 are compared with each other by comparing circuit 6, and the output is applied to gates 7 and 8 according to the comparison result. By clock CK4 from circuit 2, gates 7 and 8 are turned on to apply their outputs to up/down counter 9, and counter 9 is counted up or down according to the signal. The output of counter 9 becomes an analogue signal by D/A converter 10 and is applied to VCO 1 to cause the frequency of the VCO to approach the set frequency.
JP11188679A 1979-08-31 1979-08-31 Frequency following type voltage control oscillating unit Pending JPS5636234A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP11188679A JPS5636234A (en) 1979-08-31 1979-08-31 Frequency following type voltage control oscillating unit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP11188679A JPS5636234A (en) 1979-08-31 1979-08-31 Frequency following type voltage control oscillating unit

Publications (1)

Publication Number Publication Date
JPS5636234A true JPS5636234A (en) 1981-04-09

Family

ID=14572603

Family Applications (1)

Application Number Title Priority Date Filing Date
JP11188679A Pending JPS5636234A (en) 1979-08-31 1979-08-31 Frequency following type voltage control oscillating unit

Country Status (1)

Country Link
JP (1) JPS5636234A (en)

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5847331A (en) * 1981-09-04 1983-03-19 テクトロニクス・インコ−ポレイテツド Signal generator
JPS58189631U (en) * 1982-06-11 1983-12-16 アイコム株式会社 Digital AFC circuit
JPS59207746A (en) * 1983-04-26 1984-11-24 ドイチエ・トムソン−ブラント・ゲゼルシヤフト・ミツト・ベシユレンクテル・ハフツング Circuit device for generating stable fixed frequency
JPS63211818A (en) * 1987-02-27 1988-09-02 Toshiba Corp Digital phase synchronizing controller
JPS6432537A (en) * 1987-07-28 1989-02-02 Fujitsu Ten Ltd Pll receiver
JPS6486715A (en) * 1987-09-29 1989-03-31 Toshiba Corp Automatic frequency control circuit
EP0443221A1 (en) * 1990-02-14 1991-08-28 Atlas Powder Company Method and apparatus for a calibrated electronic timing circuit

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5847331A (en) * 1981-09-04 1983-03-19 テクトロニクス・インコ−ポレイテツド Signal generator
JPS58189631U (en) * 1982-06-11 1983-12-16 アイコム株式会社 Digital AFC circuit
JPS59207746A (en) * 1983-04-26 1984-11-24 ドイチエ・トムソン−ブラント・ゲゼルシヤフト・ミツト・ベシユレンクテル・ハフツング Circuit device for generating stable fixed frequency
JPS63211818A (en) * 1987-02-27 1988-09-02 Toshiba Corp Digital phase synchronizing controller
JPS6432537A (en) * 1987-07-28 1989-02-02 Fujitsu Ten Ltd Pll receiver
JPS6486715A (en) * 1987-09-29 1989-03-31 Toshiba Corp Automatic frequency control circuit
EP0443221A1 (en) * 1990-02-14 1991-08-28 Atlas Powder Company Method and apparatus for a calibrated electronic timing circuit

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