US2115877A - Electronic oscillator tube - Google Patents

Electronic oscillator tube Download PDF

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Publication number
US2115877A
US2115877A US49886A US4988635A US2115877A US 2115877 A US2115877 A US 2115877A US 49886 A US49886 A US 49886A US 4988635 A US4988635 A US 4988635A US 2115877 A US2115877 A US 2115877A
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United States
Prior art keywords
circuit
grid
tube
harmonics
anode
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Expired - Lifetime
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US49886A
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English (en)
Inventor
Rocard Yves
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Thales SA
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CSF Compagnie Generale de Telegraphie sans Fil SA
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    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03B—GENERATION OF OSCILLATIONS, DIRECTLY OR BY FREQUENCY-CHANGING, BY CIRCUITS EMPLOYING ACTIVE ELEMENTS WHICH OPERATE IN A NON-SWITCHING MANNER; GENERATION OF NOISE BY SUCH CIRCUITS
    • H03B5/00—Generation of oscillations using amplifier with regenerative feedback from output to input
    • H03B5/08—Generation of oscillations using amplifier with regenerative feedback from output to input with frequency-determining element comprising lumped inductance and capacitance
    • H03B5/10—Generation of oscillations using amplifier with regenerative feedback from output to input with frequency-determining element comprising lumped inductance and capacitance active element in amplifier being vacuum tube

Definitions

  • the object of the present invention is to disclose ways and means adapted to insure stabilization which will hold good even if the tuned circult of the oscillator is not included in the plate 3Q circuit of the tube, to improve the stabilizing means indicated to be effective or efficient by elementary theory taking into consideration the harmonics introduced by the curvature (knee) of thecharacteristics of the tube, and augment and enhance the effectiveness of the said ways and means by the adoption of stabilizing means and maintaining a value constant 'at the limit of sustenance of oscillations or oscillatory state of the tube and this stabilizes the proportion of har- 40- monics generated and precludes frequency variations which might arise if the said proportion of harmonics were to vary.
  • Fig, 1 shows an oscillator of thekind previously considered by Fromy (only with the radio frequency circuits).
  • the solution suggested with a view to stabilization by the said author consists in regulating the capacities C1 and C2 in resonance with the inductances L1 and L2, respectively, to the pulsation Moreover, the coefficients of mutual induction M1 and M2 should be alike, in absolute values. Under these conditions (and this is fulfillable by means of individual setting or regulation of C1 and C2, and then'of M1 and M2) the angular frequency w is strictly equal to if the situation is kept very close to the oscillating limit, and this regardless of what may be r, n, 7'2, and p, pg.
  • the frequency is protected against fluctuations in the rate of the harmonics by maintaining the proportion thereof at a constant value by an action which comprises an amplification of these harmonics, detection and automatic regularization of the oscillation.
  • Fig. 1 is given to illustrate the principles of the invention, and shows a known circuit arrangement as modified by applicant by the inclusion of resistances, and Figs. 2
  • Fig. 2 shows the ways and means comprising a multi-tube circuit arrangement adapted to the said end as applied to an oscillator of the kind dealt with in patent application No. 11,905, and in which the plate circuit of a four electrode oscillator tube is shunted by a parallel tuned circuit I forming a stopper in reference to the fundamental frequency, followed by two series circuits 2 in parallel with respect to each other, such that the combination of circuit I and circuits 2 wil1 be resonant to the frequencies of the chief harmonics (such as the second and third harmonics); at a point indicated by 3 in one of the circuits 2 there is taken off a potential which will be almost entirely due to the third harmonic, for-instance; amplification is effected in amplifier tube 1 and detection in a diode valve 5 in order to make available across a resistance 6 in the output of the diode a negative voltage corresponding to the amplitude of a typical overtone (say the third harmonic). This voltage is used for an anti-fading effect maintaining the oscillator
  • circuits I and 2 resulting in zero impedance in the plate circuit for the main harmonics exercise by themselves 'a stabilizing effect by preventing the harmonics of the plate circuit from circulating through the oscillating circuit and setting up harmonics in the grid voltage.
  • this stabilizer effect is not sufficient.
  • Fig. 3 shows a single tube circuit arrangement adopted for this last pur-v pose.
  • the coupling inductance L1 in the grid circuit of the oscillator tube 9 there are arranged as many parallel branches as there are undesirable harmonics to be eliminated, each of the said branches containing an inductance coil and a capacity in series L2 C2, L3 Ca, etc., save one branch finally which comprises only a capacity C1. All of these quantities are determined in a way so as to result in resonance of the assembly L1 C1 L2 C2 L3 C3, etc., with the fundamental and all of the harmonics of the current. If this is realized, conditions will be so that the control potential at the grid is simply given by the term di ⁇ "5 where i is the current in the inductance of the oscillation circuit just as if the oscillator were free from grid current.
  • L3 C3 may be dispensed with, while making C1 of the value a L /f), C2 of the value sgjE-nc l 2J5 and L2 of the value In this way the impedance of the grid circuit for the fundamental and the second harmonic has been eliminated, and an oscillator is obtained whose stability is entirely satisfactory, even without the additional stabilization of frequency insured by maintaining the proportion of barmonies constant being really necessary.
  • the oscillator shown in Fig. 3 offers already the property of reducing at the ration 1/11, the amplitude of the harmonic of nth order which would arise in the conventional type of oscillator where the inductance L in series with the oscillation circuit would be absent.
  • Fig. 4 shows an oscillator circuit which comprises'the combination of all of the stabilizing
  • Figs. 2 and 3 shows amulti-tube circuit comprising an oscillator 8, an'amplifier 4- and a diode rectifier 5, the oscillator tube 8 is shown with a stabilizing grid 1 separated by a screen from the other electrodes.
  • the oscillating plate may likewise be separated by means of a screen from the oscillating grid.
  • Fig. 5 shows another oscillation circuit comprising a combination of all the stabilizing means of the invention. This circuit is a combination of the features of Figs. 1, 2, and 3, and will be obvious from what has been set forth above in connection with the various figures.
  • the stabilizing circuits finally are designed so that the potential at the control electrodes (grids) will not depend upon the harmonics, and that the harmonics of the current of the control electrodes will not get up electromotive forces in the oscillation circuit properly so-called.
  • an oscillation generator comprising a multi-electrode tube having a cathode, a grid electrode and an anode electrode, said grid electrode and anode electrode each connected to a circuit containing a definite ohmic resistance and coupling said anode and grid electrodes tothe cathode of said tube, an oscillating circuit containing an ohmic resistance and coupled at the same time with said grid and anode circuits without being inserted in series in any of said circuits, the coupling degree between said oscillating circuit and said grid and anode circuits being so adjusted that the tube is maintained at oscillation entertaining limit, and means for making the frequency generated independent of internal resistances of the tube and of ohmic resistances of the external circuits, the said means comprising a first predetermined impedance in the grid circuit a second predetermined impedance in the anode circuit,
  • 'an oscillation generator comprising a multi-electrode tube having cathode, gridand anode electrodes, said grid electrode and anode electrode each connected to a circuit-containing a definite ohmic resistance and coupling said anode and grid electrodes to the cathode of said tube, an oscillating circuit containing an ohmic resistance and coupled at the same time with said grid and anode circuits, the coupling degree between said oscillating circuit and said grid and anode circuits being so adjusted that the tube is maintained at oscillation entertaining limit, a fundamental frequency and its harmonics being thus generated, means for making the fundamental frequency generated independent of internal resistances of the tube and of ohmic resistances of theexternal circuits, the said means comprising a first predetermined impedance in the grid circuit and a second predetermined impedance in the anode circuit, means connected tothe anode circuit for stopping the fundamental frequency and for passing predetermined harmonics, means for amplifying and deteoting one of the said
  • an oscillation generator comprising a mu-lti-electrode tube having cathode, grid and anode electrodes, said grid electrode and anode electrode each connected to a circuit containing a definite ohmic resistance and coupling said anode and grid electrodes to the oathode of said tube, an oscillating circuit containing an ohmic resistance and coupled at the same time with said grid and anode circuits, the coupling degree between said oscillating circuit and said grid and anode circuits being so adjusted that the tube is maintained at oscillation entertaining limit, a fundamental frequency and its harmonics being thus generated, means for making the fundamental frequency generated independent of internal resistances of the tube and of ohmic resistances of the external circuits, the said means comprising a first predetermined impedance in the grid circuit and a second predetermined impedance in the anode circuit, the said first impedance comprising an inductance-capacity assembly so dimensioned that the grid circuit is resonant to the fundamental frequency
  • an oscillation generator comprising a multi-electrode tube having cathode, grid and anode electrodes, said grid electrode and anode electrode each connected to a circuit containing a definite ohmic resistance and coupling said anode and grid electrodes to the oathode of said tube, an oscillating circuit containing an ohmic resistance and coupled at the same time with said grid and anode circuits, the coupling degree between said oscillating circuit and said grid and anode circuits being so adjusted that the tube is maintained at oscillation entertaining limit, a fundamental frequency and its harmonics being thus generated, means for making the fundamental frequency generated independent of internal resistances of the tube and of ohmic resistances of external circuits, the said means comprising a first predetermined impedance in the grid circuit and a second predetermined impedance in the anode circuit, the said of the said-harmonics, and means comprising a detected current controlled electrode in the tube for maintaining constant ratio between the amplitudes of the said harmonics and

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  • Coils Or Transformers For Communication (AREA)
  • Inductance-Capacitance Distribution Constants And Capacitance-Resistance Oscillators (AREA)
  • Particle Accelerators (AREA)
  • Oscillators With Electromechanical Resonators (AREA)
US49886A 1934-11-24 1935-11-15 Electronic oscillator tube Expired - Lifetime US2115877A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR675890X 1934-11-24

Publications (1)

Publication Number Publication Date
US2115877A true US2115877A (en) 1938-05-03

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US49886A Expired - Lifetime US2115877A (en) 1934-11-24 1935-11-15 Electronic oscillator tube

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US (1) US2115877A (de)
DE (2) DE675890C (de)
FR (1) FR794802A (de)
GB (1) GB454059A (de)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2493044A (en) * 1946-06-22 1950-01-03 Farnsworth Res Corp Deflection wave generator
US2520823A (en) * 1946-04-10 1950-08-29 Premier Crystal Lab Inc Oscillator frequency control
US2547217A (en) * 1947-10-08 1951-04-03 Hartford Nat Bank & Trust Co Circuit arrangement for counting pulses
US2622200A (en) * 1945-09-04 1952-12-16 Herman S Pierce Therapeutic device

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1118278B (de) * 1959-04-04 1961-11-30 Suedwestfunk Regelverfahren zur Erzeugung einer konstanten Amplitude des Mischproduktes eines Ringmodulators

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2622200A (en) * 1945-09-04 1952-12-16 Herman S Pierce Therapeutic device
US2520823A (en) * 1946-04-10 1950-08-29 Premier Crystal Lab Inc Oscillator frequency control
US2493044A (en) * 1946-06-22 1950-01-03 Farnsworth Res Corp Deflection wave generator
US2547217A (en) * 1947-10-08 1951-04-03 Hartford Nat Bank & Trust Co Circuit arrangement for counting pulses

Also Published As

Publication number Publication date
GB454059A (en) 1936-09-23
FR794802A (fr) 1936-02-26
DE723792C (de) 1942-08-13
DE675890C (de) 1939-05-23

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