FR2441174A1 - Digital phase comparator for phase locked loop - comprises additional bistables suppressing output when input is missing - Google Patents

Digital phase comparator for phase locked loop - comprises additional bistables suppressing output when input is missing

Info

Publication number
FR2441174A1
FR2441174A1 FR7831407A FR7831407A FR2441174A1 FR 2441174 A1 FR2441174 A1 FR 2441174A1 FR 7831407 A FR7831407 A FR 7831407A FR 7831407 A FR7831407 A FR 7831407A FR 2441174 A1 FR2441174 A1 FR 2441174A1
Authority
FR
France
Prior art keywords
phase
output
bistable
bistables
locked loop
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
FR7831407A
Other languages
French (fr)
Other versions
FR2441174B3 (en
Inventor
Jean-Luc Calvez
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.)
Laboratoire Central de Telecommunications SA
Original Assignee
Laboratoire Central de Telecommunications SA
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 Laboratoire Central de Telecommunications SA filed Critical Laboratoire Central de Telecommunications SA
Priority to FR7831407A priority Critical patent/FR2441174A1/en
Publication of FR2441174A1 publication Critical patent/FR2441174A1/en
Application granted granted Critical
Publication of FR2441174B3 publication Critical patent/FR2441174B3/fr
Granted legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R25/00—Arrangements for measuring phase angle between a voltage and a current or between voltages or currents
    • G01R25/005—Circuits for comparing several input signals and for indicating the result of this comparison, e.g. equal, different, greater, smaller, or for passing one of the input signals as output signal
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R23/00—Arrangements for measuring frequencies; Arrangements for analysing frequency spectra
    • G01R23/005—Circuits for comparing several input signals and for indicating the result of this comparison, e.g. equal, different, greater, smaller (comparing phase or frequency of 2 mutually independent oscillations in demodulators)
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03D—DEMODULATION OR TRANSFERENCE OF MODULATION FROM ONE CARRIER TO ANOTHER
    • H03D13/00—Circuits for comparing the phase or frequency of two mutually-independent oscillations
    • H03D13/003—Circuits for comparing the phase or frequency of two mutually-independent oscillations in which both oscillations are converted by logic means into pulses which are applied to filtering or integrating means
    • H03D13/004—Circuits for comparing the phase or frequency of two mutually-independent oscillations in which both oscillations are converted by logic means into pulses which are applied to filtering or integrating means the logic means delivering pulses at more than one terminal, e.g. up and down pulses

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Stabilization Of Oscillater, Synchronisation, Frequency Synthesizers (AREA)

Abstract

A digital phase and frequency comparator is utilised in a phase locked loop circuit. Such a circuit is utilised in a clock system for a multiplexed telephone exchange to produce the local clocksignal. A phase comparator comprises two bistables (1, 2) whose outputs (Q1, Q2) are applied to gating circuits to provide comparison between trailing edges of input pulses (E1, E2). The gated outputs (UP, DW) follow the sense of the phase shift whereby pulse width is proportional to the phase shift. The output (Q) of a JK bistable (10) controls an AND-gate (11) which also receives the VCO output. An RS bistable (13) detects phase delay on the comparator output (UP) and is reset to zero buthe JK bistable output. The state is recorded by a second JK bistable (14).
FR7831407A 1978-11-07 1978-11-07 Digital phase comparator for phase locked loop - comprises additional bistables suppressing output when input is missing Granted FR2441174A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
FR7831407A FR2441174A1 (en) 1978-11-07 1978-11-07 Digital phase comparator for phase locked loop - comprises additional bistables suppressing output when input is missing

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR7831407A FR2441174A1 (en) 1978-11-07 1978-11-07 Digital phase comparator for phase locked loop - comprises additional bistables suppressing output when input is missing

Publications (2)

Publication Number Publication Date
FR2441174A1 true FR2441174A1 (en) 1980-06-06
FR2441174B3 FR2441174B3 (en) 1981-08-14

Family

ID=9214539

Family Applications (1)

Application Number Title Priority Date Filing Date
FR7831407A Granted FR2441174A1 (en) 1978-11-07 1978-11-07 Digital phase comparator for phase locked loop - comprises additional bistables suppressing output when input is missing

Country Status (1)

Country Link
FR (1) FR2441174A1 (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0142171A2 (en) 1983-11-17 1985-05-22 Kabushiki Kaisha Toshiba Frequency comparing circuit
WO1987003097A1 (en) * 1985-11-12 1987-05-21 Hughes Aircraft Company Digital phase-frequency discriminator comprising simplified reset means and associated method
EP0428869A1 (en) * 1989-10-17 1991-05-29 Nec Corporation Phase detector suitable for use in phase lock loop

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0142171A2 (en) 1983-11-17 1985-05-22 Kabushiki Kaisha Toshiba Frequency comparing circuit
EP0142171A3 (en) * 1983-11-17 1985-07-10 Kabushiki Kaisha Toshiba Frequency comparing circuit
US4599580A (en) * 1983-11-17 1986-07-08 Kabushiki Kaisha Toshiba Circuit for comparing two or more frequencies
WO1987003097A1 (en) * 1985-11-12 1987-05-21 Hughes Aircraft Company Digital phase-frequency discriminator comprising simplified reset means and associated method
US4739278A (en) * 1985-11-12 1988-04-19 Hughes Aircraft Company Digital phase-frequency discriminator comprising simplified reset means and associated method
EP0428869A1 (en) * 1989-10-17 1991-05-29 Nec Corporation Phase detector suitable for use in phase lock loop

Also Published As

Publication number Publication date
FR2441174B3 (en) 1981-08-14

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