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GB721106A - Improvements in or relating to frequency-stabilized oscillator circuit arrangements - Google Patents

Improvements in or relating to frequency-stabilized oscillator circuit arrangements

Info

Publication number
GB721106A
GB721106A GB13524/53A GB1352453A GB721106A GB 721106 A GB721106 A GB 721106A GB 13524/53 A GB13524/53 A GB 13524/53A GB 1352453 A GB1352453 A GB 1352453A GB 721106 A GB721106 A GB 721106A
Authority
GB
United Kingdom
Prior art keywords
frequency
tube
grid
condenser
amplifier
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
GB13524/53A
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.)
Philips Electrical Industries Ltd
Original Assignee
Philips Electrical Industries 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 Philips Electrical Industries Ltd filed Critical Philips Electrical Industries Ltd
Publication of GB721106A publication Critical patent/GB721106A/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
    • H03L7/08—Details of the phase-locked loop
    • H03L7/10—Details of the phase-locked loop for assuring initial synchronisation or for broadening the capture range
    • H03L7/12—Details of the phase-locked loop for assuring initial synchronisation or for broadening the capture range using a scanning signal
    • 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
    • H03L7/20—Indirect frequency synthesis, i.e. generating a desired one of a number of predetermined frequencies using a frequency- or phase-locked loop using a harmonic phase-locked loop, i.e. a loop which can be locked to one of a number of harmonically related frequencies applied to it

Landscapes

  • Stabilization Of Oscillater, Synchronisation, Frequency Synthesizers (AREA)
  • Inductance-Capacitance Distribution Constants And Capacitance-Resistance Oscillators (AREA)

Abstract

721,106. Automatic frequency control systems. PHILIPS ELECTRICAL INDUSTRIES, Ltd. May 14, 1953 [May 17, 1952], No. 13524/53. Class 38 (4). The search voltage source, used for extending the catching range of a frequency stabilization system as in Specification 684,217, is constituted by a reciprocally-coupled valve pair comprising the frequency-regulating reactance tube and an auxiliary amplifier tube. As shown, the controlled oscillator comprises a heptode tube 2 with back-coupling to a tuned circuit 4, and its output is mixed with that of a reference source 11, which may be a pulse or a sine-wave source, in a phase-comparer 12. The comparer output is integrated at 13 and passed through a low-pass filter 14 to the control grid of a reactance tube 7 which is connected across the tuned circuit 4 to correct its frequency to that of the reference source 11, or to an harmonic thereof. If the frequency error is too large, the oscillator fails to lock-in, and the search voltage generator comes into operation. This comprises the reactance tube 7 and an auxiliary triode amplifier 15, reciprocally coupled. The anode of the reactance tube is connected to the grid of the amplifier 15 through a network comprising as a series member a series combination of resistor 17 and condenser 18, and as a shunt member, parallel-connected resistor 19 and condenser 20. The anode of the amplifier 15 is directly connected to the screen grid of the reactance tube 7 both of which are earthed for the oscillator frequency by a condenser 23 shunting the resistor 22. The valve pair 7, 15 oscillates at a low frequency determined by the constants of the inter-valve network, and the effective reactance of the tube 7 is thus swept through a range wide enough to ensure locking of the oscillator to the frequency source 11. As soon as locking occurs, the negative feed-back round the AFC loop renders the search voltage generator inoperative. A high-frequency choke 16, and the condenser 21, prevent the H.F. oscillations from entering the RC network 17 ... 20. The triode 15 and the heptode 2 may be in a common envelope, with the triode grid connected to an intermediate grid of the heptode.
GB13524/53A 1952-05-17 1953-05-14 Improvements in or relating to frequency-stabilized oscillator circuit arrangements Expired GB721106A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
NL721106X 1952-05-17

Publications (1)

Publication Number Publication Date
GB721106A true GB721106A (en) 1954-12-29

Family

ID=19816700

Family Applications (1)

Application Number Title Priority Date Filing Date
GB13524/53A Expired GB721106A (en) 1952-05-17 1953-05-14 Improvements in or relating to frequency-stabilized oscillator circuit arrangements

Country Status (6)

Country Link
US (1) US2775703A (en)
BE (1) BE519977A (en)
DE (1) DE936881C (en)
FR (1) FR1077341A (en)
GB (1) GB721106A (en)
NL (2) NL85193C (en)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NL89299C (en) * 1955-09-23
US2833923A (en) * 1955-10-13 1958-05-06 Gen Electric Hunting a. f. c. system
US2874292A (en) * 1956-05-21 1959-02-17 Skyline Products Inc Emergency signaling device
US2972720A (en) * 1957-09-24 1961-02-21 Westinghouse Electric Corp Automatic frequency control apparatus
DE1194463B (en) * 1961-09-05 1965-06-10 Siemens Ag Frequency control circuit

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2268872A (en) * 1939-07-11 1942-01-06 Hewlett Packard Co Variable frequency oscillation generator
BE442115A (en) * 1940-02-29
US2434294A (en) * 1943-10-22 1948-01-13 Sperry Gyroscope Co Inc Frequency control system
NL77909C (en) * 1946-09-20
BE488124A (en) * 1948-03-27
US2601436A (en) * 1948-04-17 1952-06-24 Hartford Nat Bank & Trust Co Frequency control apparatus
US2631239A (en) * 1950-02-01 1953-03-10 Lower Jack Wesley Automatic frequency control system

Also Published As

Publication number Publication date
DE936881C (en) 1955-12-22
NL169676B (en)
BE519977A (en)
NL85193C (en)
US2775703A (en) 1956-12-25
FR1077341A (en) 1954-11-05

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