JPS5558634A - Vfo circuit - Google Patents

Vfo circuit

Info

Publication number
JPS5558634A
JPS5558634A JP13055778A JP13055778A JPS5558634A JP S5558634 A JPS5558634 A JP S5558634A JP 13055778 A JP13055778 A JP 13055778A JP 13055778 A JP13055778 A JP 13055778A JP S5558634 A JPS5558634 A JP S5558634A
Authority
JP
Japan
Prior art keywords
signals
leading
inputted
period
input signal
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
JP13055778A
Other languages
Japanese (ja)
Inventor
Kazuhisa Shiraishi
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.)
Hitachi Ltd
Original Assignee
Hitachi 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 Hitachi Ltd filed Critical Hitachi Ltd
Priority to JP13055778A priority Critical patent/JPS5558634A/en
Publication of JPS5558634A publication Critical patent/JPS5558634A/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
    • H03L7/08—Details of the phase-locked loop
    • H03L7/10—Details of the phase-locked loop for assuring initial synchronisation or for broadening the capture range

Landscapes

  • Signal Processing For Digital Recording And Reproducing (AREA)
  • Stabilization Of Oscillater, Synchronisation, Frequency Synthesizers (AREA)

Abstract

PURPOSE:To extend a range where input signals can be led in, by switching the maximum detection error quantity of a saw tooth wave phase comparator to the double of a normal leading-in state at an input signal leading-in time. CONSTITUTION:Input signal pulses (period T0) are inputted to one shoot circuits SS1 and SS2 having set pulse width T0/4 and T0/2 respectively. Only at an input signal leading-in time, switching circuit 3 transfers the output of SS2 to edge detection circuit 4 by leading-in signals, and signals (period To) obtained by dividing output signals (period TO/2) of VCO9 into two by frequency divider circuit 6 are inputted to edge detector 6 by switching circuit 5, and outputs of edge detectors 7 and 4 are inputted to flip flop 8 and pass through inverter circuits 10 and 11 and NOR circuits 12 and 13, thereby outputting phase advance error and phase delay error.This output is converted to a voltage or a current by phase converter 14 and passes through low-pass filter 15 and VCO9,thereby feeding back the voltage or the current above to the input.
JP13055778A 1978-10-25 1978-10-25 Vfo circuit Pending JPS5558634A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP13055778A JPS5558634A (en) 1978-10-25 1978-10-25 Vfo circuit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP13055778A JPS5558634A (en) 1978-10-25 1978-10-25 Vfo circuit

Publications (1)

Publication Number Publication Date
JPS5558634A true JPS5558634A (en) 1980-05-01

Family

ID=15037106

Family Applications (1)

Application Number Title Priority Date Filing Date
JP13055778A Pending JPS5558634A (en) 1978-10-25 1978-10-25 Vfo circuit

Country Status (1)

Country Link
JP (1) JPS5558634A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6076812A (en) * 1983-10-04 1985-05-01 Nec Corp Phase locked loop circuit
EP0665650A1 (en) * 1994-01-31 1995-08-02 STMicroelectronics S.A. Low voltage high speed phase frequency detector

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS4999466A (en) * 1973-01-29 1974-09-19
JPS52132759A (en) * 1976-04-30 1977-11-07 Toyo Electric Mfg Co Ltd Phase comparing circuit

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS4999466A (en) * 1973-01-29 1974-09-19
JPS52132759A (en) * 1976-04-30 1977-11-07 Toyo Electric Mfg Co Ltd Phase comparing circuit

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6076812A (en) * 1983-10-04 1985-05-01 Nec Corp Phase locked loop circuit
EP0665650A1 (en) * 1994-01-31 1995-08-02 STMicroelectronics S.A. Low voltage high speed phase frequency detector
US5736872A (en) * 1994-01-31 1998-04-07 Sgs-Thomson Microelectronics S.A. Low voltage high speed phase frequency detector

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