GB642757A - Improvements in or relating to the frequency-stabilisation of oscillators - Google Patents

Improvements in or relating to the frequency-stabilisation of oscillators

Info

Publication number
GB642757A
GB642757A GB31561/47A GB3156147A GB642757A GB 642757 A GB642757 A GB 642757A GB 31561/47 A GB31561/47 A GB 31561/47A GB 3156147 A GB3156147 A GB 3156147A GB 642757 A GB642757 A GB 642757A
Authority
GB
United Kingdom
Prior art keywords
valve
beat
grid
mixers
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
GB31561/47A
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.)
Koninklijke Philips NV
Original Assignee
Philips Gloeilampenfabrieken NV
Philips Electronics NV
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 Gloeilampenfabrieken NV, Philips Electronics NV filed Critical Philips Gloeilampenfabrieken NV
Publication of GB642757A publication Critical patent/GB642757A/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
    • 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
    • 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
    • H03J7/045—Modification of automatic frequency control sensitivity or linearising automatic frequency control operation; Modification of the working range
    • 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
    • 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
    • H03L7/085—Details of the phase-locked loop concerning mainly the frequency- or phase-detection arrangement including the filtering or amplification of its output signal
    • H03L7/087—Details of the phase-locked loop concerning mainly the frequency- or phase-detection arrangement including the filtering or amplification of its output signal using at least two phase detectors or a frequency and phase detector in the loop

Landscapes

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

Abstract

642,757. Automatic frequency control systems: PHILIPS ELECTRICAL, Ltd. Nov. 28, 1947, No. 31561. Convention date, Sept. 16, 1946. [Class 38 (iv)] Relates to means for synchronizing a controlled oscillator with a standard oscillator of the kind in which the oscillators beat with each other in two mixers arranged to give two quadrature-related versions of the beat frequency ; and consists in deriving the frequencycorrecting voltage by giving a further phase shift, by means including a diode valve, to one of the beats to bring it into phase agreement or phase opposition with the other beat, and by applying the beats to a mixer tube. As shown, one input wave f is applied to a phasing- network A which supplies quadrature phases to two mixers M1, M2. The other input f2 is applied in parallel to the mixers. The beat output from the mixer M1 is fed with 90 degrees phase shift through a, resistor 3 and condenser C1 to the inner grid g1 of a multi-grid valve B, and the beat output from the other mixer M2 is fed without phase shift through a resistor 4 and condenser C2 to an outer control grid g3. The voltages on the grids are thus brought into phase agreement or phase opposition according as f1 is > or < f2, and the anode voltage R of the valve B can be used for restoring synchronism. The grid g1 is earthed through a diode valve D, and the cathode is biased by resistors W, so arranged that the diode does not carry current unless the grid is sufficiently negative to cut off the current in the valve B. When the beat is of zero or such low-frequency as to be blocked by the condensers C1, C2, the output voltage at the mixers is applied through high resistances 6, 7 to the inner grid g1 of the valve B which in this case operates as a simple amplifier. In a modified circuit (Fig. 4, not shown) beats of very low frequency, or other slow variations, are applied through resistors from the mixer outputs to the control lead R without amplification in the valve B. -
GB31561/47A 1946-09-16 1947-11-28 Improvements in or relating to the frequency-stabilisation of oscillators Expired GB642757A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
NL642757X 1946-09-16

Publications (1)

Publication Number Publication Date
GB642757A true GB642757A (en) 1950-09-13

Family

ID=19791818

Family Applications (1)

Application Number Title Priority Date Filing Date
GB31561/47A Expired GB642757A (en) 1946-09-16 1947-11-28 Improvements in or relating to the frequency-stabilisation of oscillators

Country Status (5)

Country Link
BE (1) BE477915A (en)
DE (1) DE824960C (en)
FR (1) FR955773A (en)
GB (1) GB642757A (en)
NL (1) NL69020C (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3177443A (en) * 1961-03-28 1965-04-06 Marconi Co Ltd Arrangement for automatically providing frequency equality between two given signals

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE965500C (en) * 1952-05-24 1957-06-13 Fernseh Gmbh Method for synchronizing a vibration generator
DE1271212B (en) * 1964-04-15 1968-06-27 Telefunken Patent Method for regulating the frequency of several oscillators and arrangement for carrying out the method

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE881554C (en) * 1942-12-08 1953-07-02 Aeg Method for determining the assignment of diffraction rings to the parts of an object composed of different crystallites

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3177443A (en) * 1961-03-28 1965-04-06 Marconi Co Ltd Arrangement for automatically providing frequency equality between two given signals

Also Published As

Publication number Publication date
FR955773A (en) 1950-01-19
NL69020C (en)
BE477915A (en)
DE824960C (en) 1951-12-17

Similar Documents

Publication Publication Date Title
US2188611A (en) Impulse generator
GB565703A (en) Synchronizers for electric oscillators
US2397961A (en) Detector
GB642757A (en) Improvements in or relating to the frequency-stabilisation of oscillators
GB607798A (en) Improvements in or relating to frequency-control circuits
US2920194A (en) Device for variable amplitude correction
GB648049A (en) Improvements in and relating to angle modulation demodulators
GB721339A (en) Improvements in or relating to synchronizing circuits for electric oscillators
GB642796A (en) Improvements in or relating to superheterodyne mixing circuits
US2492767A (en) Oscillator
GB625268A (en) Improvements in circuits for modulating the frequency or the phase of electrical oscillations
GB658837A (en) Improvements in or relating to circuits for automatic frequency-correction
GB643290A (en) Improvements in or relating to circuits for demodulating frequency-modulated oscillations
GB548148A (en) Improvements relating to thermionic oscillation generators
GB629929A (en) Improvements in and relating to frequency control circuit arrangements
GB537699A (en) Improvements in frequency modulation systems
GB629238A (en) Improvements in or relating to electron discharge devices
GB617541A (en) Improvements in or relating to thermionic valve circuits for generating two alternating voltages whose frequencies are in harmonic relation
GB620222A (en) Improvements in and relating to phase shifting circuits
GB640264A (en) Arrangement for simulating a reactive impedance
GB879507A (en) Improvements in or relating to circuit arrangements for frequency modulation
GB555771A (en) Stabilised vacuum tube variable frequency oscillators
GB637597A (en) Improvements in or relating to circuit arrangements for producing control signals dependent upon the frequency difference between electrical oscillations
GB489486A (en) Improvements in frequency changers for heterodyne receivers and modulators
GB632408A (en) Variable frequency vacuum tube oscillator