JPS60190024A - Digital phase locked loop circuit - Google Patents

Digital phase locked loop circuit

Info

Publication number
JPS60190024A
JPS60190024A JP59045420A JP4542084A JPS60190024A JP S60190024 A JPS60190024 A JP S60190024A JP 59045420 A JP59045420 A JP 59045420A JP 4542084 A JP4542084 A JP 4542084A JP S60190024 A JPS60190024 A JP S60190024A
Authority
JP
Japan
Prior art keywords
frequency
dead band
signal
output
divider
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
JP59045420A
Other languages
Japanese (ja)
Inventor
Kohei Ishizuka
Yoshikazu Era
Takashi Miyamoto
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 JP59045420A priority Critical patent/JPS60190024A/en
Publication of JPS60190024A publication Critical patent/JPS60190024A/en
Pending legal-status Critical Current

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
    • H03L7/099Details of the phase-locked loop concerning mainly the controlled oscillator of the loop
    • H03L7/0991Details of the phase-locked loop concerning mainly the controlled oscillator of the loop the oscillator being a digital oscillator, e.g. composed of a fixed oscillator followed by a variable frequency divider
    • H03L7/0992Details of the phase-locked loop concerning mainly the controlled oscillator of the loop the oscillator being a digital oscillator, e.g. composed of a fixed oscillator followed by a variable frequency divider comprising a counter or a frequency divider

Abstract

PURPOSE:To decrease jitters by using a circuit controlling a region (dead band) where an output state of a frequency divider is unchanged with respect to an input signal while phase lock state is attained. CONSTITUTION:It is supposed that a frequency of an input signal is near a frequency applied with 1/m frequency division of a signal from a reference oscillator 5. The phase difference between the input signal at a terminal 1 and the signal from a frequency divider 6 is detected by a phase comparator 3. A frequency dividing number control circuit 4 sets the frequency division numbers of m-1 or m+1 depending on the lead/lag of both and the frequency division number is fixed to only (m) by a dead band control signal obtained via a dead band control circuit 7 at the region of + or -T/2 before and after the divider output rising change point. The output of the oscillator 5 is frequency-divided into a frequency dividing number required for the frequency divider 6 by using the control signal. The output is inputted to the phase comparator 3 and also outputted from a terminal 2 at the same time. Thus, jitters are reduced by the introduction of the dead band in case of the assumption above.
JP59045420A 1984-03-12 1984-03-12 Digital phase locked loop circuit Pending JPS60190024A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP59045420A JPS60190024A (en) 1984-03-12 1984-03-12 Digital phase locked loop circuit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP59045420A JPS60190024A (en) 1984-03-12 1984-03-12 Digital phase locked loop circuit

Publications (1)

Publication Number Publication Date
JPS60190024A true JPS60190024A (en) 1985-09-27

Family

ID=12718772

Family Applications (1)

Application Number Title Priority Date Filing Date
JP59045420A Pending JPS60190024A (en) 1984-03-12 1984-03-12 Digital phase locked loop circuit

Country Status (1)

Country Link
JP (1) JPS60190024A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6346814A (en) * 1986-08-15 1988-02-27 Hitachi Ltd Digital phase synchronous circuit
JPS63151218A (en) * 1986-12-16 1988-06-23 Fujitsu Ltd Digital pll circuit
JP2007324013A (en) * 2006-06-02 2007-12-13 Shimadzu Corp Rotary anode x-ray tube device

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5649498A (en) * 1979-09-28 1981-05-06 Kabel Metallwerke Ghh Conduit system for low temperature and*or liquid gas

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5649498A (en) * 1979-09-28 1981-05-06 Kabel Metallwerke Ghh Conduit system for low temperature and*or liquid gas

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6346814A (en) * 1986-08-15 1988-02-27 Hitachi Ltd Digital phase synchronous circuit
JPS63151218A (en) * 1986-12-16 1988-06-23 Fujitsu Ltd Digital pll circuit
JP2007324013A (en) * 2006-06-02 2007-12-13 Shimadzu Corp Rotary anode x-ray tube device

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