GB1096216A - Synchronised oscillator of variable high frequency - Google Patents

Synchronised oscillator of variable high frequency

Info

Publication number
GB1096216A
GB1096216A GB10574/65A GB1057465A GB1096216A GB 1096216 A GB1096216 A GB 1096216A GB 10574/65 A GB10574/65 A GB 10574/65A GB 1057465 A GB1057465 A GB 1057465A GB 1096216 A GB1096216 A GB 1096216A
Authority
GB
United Kingdom
Prior art keywords
signal
produce
control
oscillator
frequency
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
GB10574/65A
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.)
STC PLC
Original Assignee
Standard Telephone and Cables PLC
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 Standard Telephone and Cables PLC filed Critical Standard Telephone and Cables PLC
Publication of GB1096216A publication Critical patent/GB1096216A/en
Expired legal-status Critical Current

Links

Classifications

    • 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
    • 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
    • H03L7/08—Details of the phase-locked loop
    • H03L7/10—Details of the phase-locked loop for assuring initial synchronisation or for broadening the capture range
    • H03L7/113—Details of the phase-locked loop for assuring initial synchronisation or for broadening the capture range using frequency discriminator
    • 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

Landscapes

  • Stabilization Of Oscillater, Synchronisation, Frequency Synthesizers (AREA)

Abstract

1,096,216. Automatic frequency control systems. STANDARD TELEPHONES & CABLES Ltd. March 12, 1965 [March 13, 1964], No. 10574/65. Heading H3A. In an automatic frequency control system a frequency generator Gf produces harmonically related signal H<SP>1</SP>NU, H<SP>11</SP>NU, NU which are mixed together in a reference frequency generator G 8 to produce a variable frequency output signal HNU-pNU+MU in which pNU and MU are variable terms. This output signal is mixed in mixer H 2 with the output F v from the oscillator to be controlled to produce an error signal which is divided down in divider Dd to result in a signal NU. This signal and the reference signal NU are then both multiplied by a constant C in harmonic generators G h1 , G 2 to produce signals which are compared to produce control signals for the oscillator. These control signals ##, C## are applied to variable capacitance diodes CV1, CV2 in the oscillator, Fig. 6 (not shown). In the error signal generator, Fig. 4, the two signals CNU are compared in a phase comparator circuit # 1 to provide a control signal C##. The signal NU from divider Dd and a further signal (C + 1) NU are fed to a mixer H 7 to produce a further signal CNU having a different phase from that derived from generator G h1 . This further signal is compared with the reference CNU signal in a frequency comparator # 2 to produce a further control signal ##. The comparature # 1 , # 2 , Fig. 5 (not shown), may be of the balanced diode type. In order to give a smooth change over between coarse and fine control an attenuation link At is provided between the coarse and fine control paths.
GB10574/65A 1964-03-13 1965-03-12 Synchronised oscillator of variable high frequency Expired GB1096216A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR967335A FR1396537A (en) 1964-03-13 1964-03-13 Variable high frequency synchronized oscillator

Publications (1)

Publication Number Publication Date
GB1096216A true GB1096216A (en) 1967-12-20

Family

ID=8825488

Family Applications (1)

Application Number Title Priority Date Filing Date
GB10574/65A Expired GB1096216A (en) 1964-03-13 1965-03-12 Synchronised oscillator of variable high frequency

Country Status (5)

Country Link
BE (1) BE660997A (en)
DE (1) DE1280987B (en)
FR (1) FR1396537A (en)
GB (1) GB1096216A (en)
NL (1) NL6503148A (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3435367A (en) * 1967-08-24 1969-03-25 Bendix Corp Digitally controlled frequency synthesizer

Also Published As

Publication number Publication date
DE1280987B (en) 1968-10-24
FR1396537A (en) 1965-04-23
BE660997A (en) 1965-09-13
NL6503148A (en) 1965-09-14

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