JPS6016731A - Pll circuit device - Google Patents

Pll circuit device

Info

Publication number
JPS6016731A
JPS6016731A JP12799084A JP12799084A JPS6016731A JP S6016731 A JPS6016731 A JP S6016731A JP 12799084 A JP12799084 A JP 12799084A JP 12799084 A JP12799084 A JP 12799084A JP S6016731 A JPS6016731 A JP S6016731A
Authority
JP
Grant status
Application
Patent type
Prior art keywords
low pass
pass filter
state
time
lock
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
JP12799084A
Inventor
Hiroshi Haruki
Original Assignee
Matsushita Electric Ind 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

Links

Classifications

    • HELECTRICITY
    • H03BASIC ELECTRONIC CIRCUITRY
    • H03LAUTOMATIC CONTROL, STARTING, SYNCHRONISATION, OR STABILISATION OF GENERATORS OF ELECTRONIC OSCILLATIONS OR PULSES
    • H03L7/00Automatic control of frequency or phase; Synchronisation
    • H03L7/06Automatic control of frequency or phase; Synchronisation using a reference signal applied to a frequency- or phase-locked loop
    • H03L7/08Details of the phase-locked loop
    • H03L7/10Details of the phase-locked loop for assuring initial synchronisation or for broadening the capture range
    • H03L7/107Details of the phase-locked loop for assuring initial synchronisation or for broadening the capture range using a variable transfer function for the loop, e.g. low pass filter having a variable bandwidth

Abstract

PURPOSE:To quicken a lock speed by selecting a time constant of a low pass filter at the unlock state so as to be minimized for the lock time and changing over the said time constant at the lock state so as to minimize an FM noise. CONSTITUTION:When a PLL loop is in the unlock state, a discriminating circuit 6 detects the state and controls changeover switches 7, 8 so as to connect a low pass filter 4 between a phase comparator 1 and a VCO2. The low pass filter 4 consists of a lag/lead filter where the time constant is selected so as to attain the unity of the damping coefficient, and even if the FM noise is increased, the lockup time is decreased. When the PLL loop transits to the lock state, the discriminating circuit 6 detects it, the changeover switches 7, 8 connect a low pass filter 5 having a damping coefficient of nearly 0.3 so as to decrease the FM noise and improve the performance. Thus, the lockup time is reduced without deteriorating the performance.
JP12799084A 1984-06-21 1984-06-21 Pll circuit device Pending JPS6016731A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP12799084A JPS6016731A (en) 1984-06-21 1984-06-21 Pll circuit device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP12799084A JPS6016731A (en) 1984-06-21 1984-06-21 Pll circuit device

Publications (1)

Publication Number Publication Date
JPS6016731A true true JPS6016731A (en) 1985-01-28

Family

ID=14973722

Family Applications (1)

Application Number Title Priority Date Filing Date
JP12799084A Pending JPS6016731A (en) 1984-06-21 1984-06-21 Pll circuit device

Country Status (1)

Country Link
JP (1) JPS6016731A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0211594A2 (en) * 1985-08-02 1987-02-25 Libera Developments Limited Phase-locked digital synthesiser
EP0453280A1 (en) * 1990-04-19 1991-10-23 Nec Corporation PLL frequency synthesizer
US5541965A (en) * 1993-01-13 1996-07-30 U.S. Philips Corporation Carrier frequency synchronization device using two different B/W filters

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5313862A (en) * 1976-07-23 1978-02-07 Hitachi Ltd Phase drawn oscillator
JPS5343462A (en) * 1976-10-01 1978-04-19 Mitsubishi Electric Corp Phase synchronous circuit
JPS54121646A (en) * 1978-03-14 1979-09-20 Toyo Communication Equip Phase synchronization oscillator shortening synchronizer time

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5313862A (en) * 1976-07-23 1978-02-07 Hitachi Ltd Phase drawn oscillator
JPS5343462A (en) * 1976-10-01 1978-04-19 Mitsubishi Electric Corp Phase synchronous circuit
JPS54121646A (en) * 1978-03-14 1979-09-20 Toyo Communication Equip Phase synchronization oscillator shortening synchronizer time

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0211594A2 (en) * 1985-08-02 1987-02-25 Libera Developments Limited Phase-locked digital synthesiser
EP0453280A1 (en) * 1990-04-19 1991-10-23 Nec Corporation PLL frequency synthesizer
US5541965A (en) * 1993-01-13 1996-07-30 U.S. Philips Corporation Carrier frequency synchronization device using two different B/W filters

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