JPS5567242A - Phase locked loop circuit - Google Patents

Phase locked loop circuit

Info

Publication number
JPS5567242A
JPS5567242A JP14077178A JP14077178A JPS5567242A JP S5567242 A JPS5567242 A JP S5567242A JP 14077178 A JP14077178 A JP 14077178A JP 14077178 A JP14077178 A JP 14077178A JP S5567242 A JPS5567242 A JP S5567242A
Authority
JP
Japan
Prior art keywords
noise
capacitor
loop filter
forcedly
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
JP14077178A
Other languages
Japanese (ja)
Inventor
Junichi Hikita
Masaki Nakagawa
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.)
Rohm Co Ltd
Original Assignee
Rohm Co Ltd
Toyo Electronics Industry 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 Rohm Co Ltd, Toyo Electronics Industry Corp filed Critical Rohm Co Ltd
Priority to JP14077178A priority Critical patent/JPS5567242A/en
Publication of JPS5567242A publication Critical patent/JPS5567242A/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
    • H03L7/085—Details of the phase-locked loop concerning mainly the frequency- or phase-detection arrangement including the filtering or amplification of its output signal
    • H03L7/093—Details of the phase-locked loop concerning mainly the frequency- or phase-detection arrangement including the filtering or amplification of its output signal using special filtering or amplification characteristics in the loop

Landscapes

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

Abstract

PURPOSE:To resolve phase slippage dependent upon noise in a short time by discharging forcedly the capacitor of a loop filter temporarily when detecting that noise is included in input signals. CONSTITUTION:A PLL circuit is constituted by phase comparator 3, loop filter 4, DC amplifier 5, voltage control oscillator 6 and frequency dividers 7 and 8. When noise detector 10 detects pulse noise in signals, time set circuit 11 is triggerred by the detection signal from detector 10 and issues the output only for a set time. By this output, switch 13 which is connected in parallel to capacitor 12 constituting loop filter 4 is closed to discharge forcedly capacitor 12.
JP14077178A 1978-11-15 1978-11-15 Phase locked loop circuit Pending JPS5567242A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP14077178A JPS5567242A (en) 1978-11-15 1978-11-15 Phase locked loop circuit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP14077178A JPS5567242A (en) 1978-11-15 1978-11-15 Phase locked loop circuit

Publications (1)

Publication Number Publication Date
JPS5567242A true JPS5567242A (en) 1980-05-21

Family

ID=15276357

Family Applications (1)

Application Number Title Priority Date Filing Date
JP14077178A Pending JPS5567242A (en) 1978-11-15 1978-11-15 Phase locked loop circuit

Country Status (1)

Country Link
JP (1) JPS5567242A (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4559505A (en) * 1983-01-04 1985-12-17 Motorola, Inc. Frequency synthesizer with improved priority channel switching
JPS63182693U (en) * 1987-05-14 1988-11-24
JPH06197014A (en) * 1992-12-25 1994-07-15 Mitsubishi Electric Corp Phase synchronization circuit
JP2010045458A (en) * 2008-08-08 2010-02-25 Canon Inc Phase synchronization circuit and control method of the same, communication device

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4559505A (en) * 1983-01-04 1985-12-17 Motorola, Inc. Frequency synthesizer with improved priority channel switching
JPS63182693U (en) * 1987-05-14 1988-11-24
JPH06197014A (en) * 1992-12-25 1994-07-15 Mitsubishi Electric Corp Phase synchronization circuit
JP2010045458A (en) * 2008-08-08 2010-02-25 Canon Inc Phase synchronization circuit and control method of the same, communication device

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