GB1513963A - Phase detector - Google Patents

Phase detector

Info

Publication number
GB1513963A
GB1513963A GB1695175A GB1695175A GB1513963A GB 1513963 A GB1513963 A GB 1513963A GB 1695175 A GB1695175 A GB 1695175A GB 1695175 A GB1695175 A GB 1695175A GB 1513963 A GB1513963 A GB 1513963A
Authority
GB
United Kingdom
Prior art keywords
phase
contents
error signal
register
stage
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.)
Expired
Application number
GB1695175A
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.)
British Aircraft Corp Ltd
Original Assignee
British Aircraft Corp 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 British Aircraft Corp Ltd filed Critical British Aircraft Corp Ltd
Priority to GB1695175A priority Critical patent/GB1513963A/en
Publication of GB1513963A publication Critical patent/GB1513963A/en
Expired legal-status Critical Current

Links

Classifications

    • 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
    • H03D13/001—Circuits for comparing the phase or frequency of two mutually-independent oscillations in which a pulse counter is used followed by a conversion into an analog signal
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03J—TUNING RESONANT CIRCUITS; SELECTING RESONANT CIRCUITS
    • H03J7/00—Automatic frequency control; Automatic scanning over a band of frequencies
    • H03J7/02—Automatic frequency control
    • H03J7/04—Automatic frequency control where the frequency control is accomplished by varying the electrical characteristics of a non-mechanically adjustable element or where the nature of the frequency controlling element is not significant
    • H03J7/06—Automatic frequency control where the frequency control is accomplished by varying the electrical characteristics of a non-mechanically adjustable element or where the nature of the frequency controlling element is not significant using counters or frequency dividers
    • H03J7/065—Automatic frequency control where the frequency control is accomplished by varying the electrical characteristics of a non-mechanically adjustable element or where the nature of the frequency controlling element is not significant using counters or frequency dividers the counter or frequency divider being used in a phase locked loop
    • 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
    • H03L7/16—Indirect frequency synthesis, i.e. generating a desired one of a number of predetermined frequencies using a frequency- or phase-locked loop
    • H03L7/18—Indirect frequency synthesis, i.e. generating a desired one of a number of predetermined frequencies using a frequency- or phase-locked loop using a frequency divider or counter in the loop
    • H03L7/183—Indirect frequency synthesis, i.e. generating a desired one of a number of predetermined frequencies using a frequency- or phase-locked loop using a frequency divider or counter in the loop a time difference being used for locking the loop, the counter counting between fixed numbers or the frequency divider dividing by a fixed number
    • H03L7/191—Indirect frequency synthesis, i.e. generating a desired one of a number of predetermined frequencies using a frequency- or phase-locked loop using a frequency divider or counter in the loop a time difference being used for locking the loop, the counter counting between fixed numbers or the frequency divider dividing by a fixed number using at least two different signals from the frequency divider or the counter for determining the time difference

Landscapes

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

Abstract

1513963 Phase detectors BRITISH AIRCRAFT CORP Ltd 21 July 1976 [24 April 1975] 16951/75 Heading H3A A phase detector suitable for phase lock control of a local oscillator in a superhet receiver (see Fig. 2) comprises an arrangement 20, 21 for circulating marker digits around signal paths of the same length at speeds respectively dependent on input, reference frequencies at 5, 7 and first and second detection circuits G7, G8 (Fig. 3) responsive to the relative spacing between the marker digits for generating phase lag and phase lead output signals respectively. The paths may be defined by shift registers 20, 21 and the detectors G7, G8 compare the contents of each stage of the first (or second) with the contents of the preceding stage in the second (or first) shift register for providing phase lag or lead signals to an error voltage generator 26. A third detector G9 compares the contents of each stage of one register with contents of stages lying two behind in the other register to provide a frequency error signal. In response to the appearance of a frequency error signal, a combination of fine and coarse memories 28, 29 apply a frequency error signal of the right polarity to the generator 26, to attain frequency equality within one period of the reference waveform at the end of which the registers 20, 21 are reset.
GB1695175A 1976-07-21 1976-07-21 Phase detector Expired GB1513963A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB1695175A GB1513963A (en) 1976-07-21 1976-07-21 Phase detector

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB1695175A GB1513963A (en) 1976-07-21 1976-07-21 Phase detector

Publications (1)

Publication Number Publication Date
GB1513963A true GB1513963A (en) 1978-06-14

Family

ID=10086601

Family Applications (1)

Application Number Title Priority Date Filing Date
GB1695175A Expired GB1513963A (en) 1976-07-21 1976-07-21 Phase detector

Country Status (1)

Country Link
GB (1) GB1513963A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0011128A1 (en) * 1978-11-08 1980-05-28 Sanyo Electric Co., Ltd. Digital phase comparing apparatus
FR2452219A1 (en) * 1979-03-21 1980-10-17 Labo Electronique Physique TV voltage tuning circuit - has digital frequency control circuit which counts intermediate frequency cycles and compares count with preset value

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0011128A1 (en) * 1978-11-08 1980-05-28 Sanyo Electric Co., Ltd. Digital phase comparing apparatus
FR2452219A1 (en) * 1979-03-21 1980-10-17 Labo Electronique Physique TV voltage tuning circuit - has digital frequency control circuit which counts intermediate frequency cycles and compares count with preset value

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Legal Events

Date Code Title Description
PS Patent sealed
732 Registration of transactions, instruments or events in the register (sect. 32/1977)
732 Registration of transactions, instruments or events in the register (sect. 32/1977)
746 Register noted 'licences of right' (sect. 46/1977)
PCNP Patent ceased through non-payment of renewal fee