JPS54139365A - Unlock detector circuit for pll synthesizer - Google Patents

Unlock detector circuit for pll synthesizer

Info

Publication number
JPS54139365A
JPS54139365A JP4745078A JP4745078A JPS54139365A JP S54139365 A JPS54139365 A JP S54139365A JP 4745078 A JP4745078 A JP 4745078A JP 4745078 A JP4745078 A JP 4745078A JP S54139365 A JPS54139365 A JP S54139365A
Authority
JP
Japan
Prior art keywords
detector circuit
output
circuit
instant
vco
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.)
Granted
Application number
JP4745078A
Other languages
Japanese (ja)
Other versions
JPS6029258B2 (en
Inventor
Masahiro Watanabe
Hiroshi Haruki
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 JP53047450A priority Critical patent/JPS6029258B2/en
Publication of JPS54139365A publication Critical patent/JPS54139365A/en
Publication of JPS6029258B2 publication Critical patent/JPS6029258B2/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03J—TUNING RESONANT CIRCUITS; SELECTING RESONANT CIRCUITS
    • H03J5/00—Discontinuous tuning; Selecting predetermined frequencies; Selecting frequency bands with or without continuous tuning in one or more of the bands, e.g. push-button tuning, turret tuner
    • H03J5/02—Discontinuous tuning; Selecting predetermined frequencies; Selecting frequency bands with or without continuous tuning in one or more of the bands, e.g. push-button tuning, turret tuner with variable tuning element having a number of predetermined settings and adjustable to a desired one of these settings
    • H03J5/0245—Discontinuous tuning using an electrical variable impedance element, e.g. a voltage variable reactive diode, in which no corresponding analogue value either exists or is preset, i.e. the tuning information is only available in a digital form
    • H03J5/0272—Discontinuous tuning using an electrical variable impedance element, e.g. a voltage variable reactive diode, in which no corresponding analogue value either exists or is preset, i.e. the tuning information is only available in a digital form the digital values being used to preset a counter or a frequency divider in a phase locked loop, e.g. frequency synthesizer
    • H03J5/0281—Discontinuous tuning using an electrical variable impedance element, e.g. a voltage variable reactive diode, in which no corresponding analogue value either exists or is preset, i.e. the tuning information is only available in a digital form the digital values being used to preset a counter or a frequency divider in a phase locked loop, e.g. frequency synthesizer the digital values being held in an auxiliary non erasable memory

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Hardware Design (AREA)
  • Microelectronics & Electronic Packaging (AREA)
  • Stabilization Of Oscillater, Synchronisation, Frequency Synthesizers (AREA)

Abstract

PURPOSE:To make it possible to break the output of an abnormal variable frequency oscillator (VCO) from the instant of an unlocked state by providing a channel switching detector circuit in the unlock detector circuit. CONSTITUTION:Pulse width detector circuit 9 outputs signals while the output pulse width of phase comparator 3 is over a fixed value, and irregular code detector circuit 8 outputs signals when channel selection signal input is a code which does not correspond to regular channels, and channel detector circuit B consisting of delay circuit 12 and disagreement detector circuit 13 outputs signals for a fixed time from the instant of channel switching. Variable frequency oscillator output breaking control circuit 14 causes the output of VCO 5 to pass through switch circuit 11 at a fixed time after outputs of three circuits above are erased. A detector circuit for which a normal unlock detector circuit A is substituted is constituted by these circuits to prevent the abnormal VCO output from being outputted to succeeding stages from the instant when a PLL synthesizer has unlocked.
JP53047450A 1978-04-20 1978-04-20 Unlock detection circuit for PLL synthesizer Expired JPS6029258B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP53047450A JPS6029258B2 (en) 1978-04-20 1978-04-20 Unlock detection circuit for PLL synthesizer

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP53047450A JPS6029258B2 (en) 1978-04-20 1978-04-20 Unlock detection circuit for PLL synthesizer

Publications (2)

Publication Number Publication Date
JPS54139365A true JPS54139365A (en) 1979-10-29
JPS6029258B2 JPS6029258B2 (en) 1985-07-09

Family

ID=12775482

Family Applications (1)

Application Number Title Priority Date Filing Date
JP53047450A Expired JPS6029258B2 (en) 1978-04-20 1978-04-20 Unlock detection circuit for PLL synthesizer

Country Status (1)

Country Link
JP (1) JPS6029258B2 (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS56102129A (en) * 1980-01-18 1981-08-15 Nec Corp Frequency synthesizer
JPS57201342A (en) * 1981-03-20 1982-12-09 Esu Ro Kuuotsuku Pulse delay compensating device

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS56102129A (en) * 1980-01-18 1981-08-15 Nec Corp Frequency synthesizer
JPS57201342A (en) * 1981-03-20 1982-12-09 Esu Ro Kuuotsuku Pulse delay compensating device

Also Published As

Publication number Publication date
JPS6029258B2 (en) 1985-07-09

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