US2557188A - Circuit arrangement for producing a high-frequency oscillation - Google Patents

Circuit arrangement for producing a high-frequency oscillation Download PDF

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Publication number
US2557188A
US2557188A US55262A US5526248A US2557188A US 2557188 A US2557188 A US 2557188A US 55262 A US55262 A US 55262A US 5526248 A US5526248 A US 5526248A US 2557188 A US2557188 A US 2557188A
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US
United States
Prior art keywords
frequency
circuit
voltage
anode
grid
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Expired - Lifetime
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US55262A
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English (en)
Inventor
Hugenholtz Eduard Herman
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Hartford National Bank and Trust Co
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Hartford National Bank and Trust Co
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    • 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
    • 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
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03C—MODULATION
    • H03C3/00—Angle modulation
    • H03C3/10—Angle modulation by means of variable impedance
    • H03C3/24—Angle modulation by means of variable impedance by means of a variable resistive element, e.g. tube

Definitions

  • This invention relates to circuit-arrangements for producing a high-frequency oscillation, of which the frequency is variable in accordance with a control voltage supplied to the control grid of a regeneratively back-coupled discharge tube. It has more particularly for its purpose to provide a very simple circuit-arrangement for frequencymodulation or after-adjustment of the frequency of a high-frequency oscillation.
  • the oathode-circuit of this regeneratively back-coupled tube comprises a resistance, a reactance being provided between cathode and grid. Due to this the phase displacement conferred on the high-frequency alternating voltage supplied to the grid of the tube depends upon the high frequency voltage across the cathode resistance. Since a modulating control voltage influencing the mutual conductance of the discharge tube is at the same time supplied to the said grid, so that the high-frequency voltage across the cathode-resistance is varied, the variable phase shift thus produced will cause a variation of the frequency produced by means of the circuit-arrangement.
  • this circuit-arrangement suiiers from the disadvantage that, since the efiective mutual conductance of the discharge tube is not altered by a variation of the grid bias, the value of a high-frequency voltage across the cathode resistance depends only to a small degree upon the value of the modulating control voltage, so that the oscillation produced is variable in frequency to a low degree only.
  • This disadvantage might be avoided, for instance by making the modulating control voltage operative in the anode-circuit of the discharge tube. In this event, however, the required control voltage should be much higher and in addition the source of control voltage must supply anode current for the discharge tube, which entails a complicated circuit-arrangement.
  • the invention provides a different arrangement which permits by simple means a high-frequency oscillation to be produced of which the frequency is variable with the aid of a regulating voltage supplied to the grid of the discharge tube. It has the advantages that the said control is effected substantially without loss of energy and that considerable frequency variations are possible. In one form of the circuit-arrangement according to the invention the additional advantage is obtained that the amplitude of the alternating voltage supplied to the grid of the discharge tube remains substantially constant, which permits the mutual conductance to be greatly varied.
  • the feedback circuit of the discharge tube comprises a voltage discriminative impedance of which the value varies in accordance with the amplitude of the alternating voltage generated in the anode circuit of the discharge tube, as a result of which a phase-shift of the high-frequency alternating voltage is produced across this impedance, which shift involves a frequency variation of the oscillation produced.
  • the reference numeral I denotes a discharge tube which is regeneratively fed back by way of the tuned circuit 2 and coupled inductance 3 with the result that a high-frequency oscillation is produced, of which the frequency corresponds approximately to the natural resonance of the tuned oscillating circuit 2 if the network inserted in the said anode circuit of tube l and comprising a small condenser 4 and a voltage discriminative impedance, for example a biased diode 5, would not produce a phase-shift of the oscillation supplied to the circuit 2. If the amplitude of the voltage produced in the anode circuit is small so that the diode 5 does not carry current, this will be the case since a small condenser 6 is connected in parallel with the diode 5.
  • a modulating voltage is at the same time supplied, by way of the terminals 1, to the grid of the discharge tube I.
  • the high-frequency voltage produced in the anode circuit of the discharge tube I will increase with an increase in modulating voltage, owing to which the diode 5 carries current.
  • this diode 5 constitutes a resistance in parallel with the condenser 6 with the result that the voltage fed to the circuit 2 is shifted in phase. Due to this the frequency of the oscillation produced Will adjust itself to a difierent value, since the total phase displacement of the high-frequency voltage between grid and anode must be 180.
  • the choke coils 8 and 9 permit the passage of direct current and have a high impedance to highrequency currents.
  • the embodiment described offers the additional advantage that the amplitude of the voltage produced across the oscillating circuit 2, and consequently also the amplitude of the alternating grid voltage of the discharge tube I acquires a constant value, thus avoiding the disadvantage that by varying the grid-adjustment of the discharge tube I With the aid of the modulating voltage I such a variable alternating anode voltage is produced that the efiective mutual conductance of this tube should remain substantially the same.
  • the diode 5 may be replaced by a different voltage discriminative impedance, for example a rectifying cell. Furthermore, this impedance need not be inserted in the anode circuit of the discharge tube I but may, in general, be inserted at an arbitrary point in the circuit-arrangement by which it brings about a phase shift of the highfrequency voltage, which depends upon the modulating voltage,
  • Apparatus for producing high-frequency oscillations whose frequency varies in accordance with the instantaneous amplitude of a control voltage comprising an electron discharge tube provided with a cathode, a grid and an anode, a resonant circuit coupled between said anode and said cathode, a feedback circuit regeneratively coupling said resonant circuit to said grid to sustain high-frequency oscillations in said resonant circuit, a phase-shifting network interposed between said anode and said resonant circuit and including an impedance element whose value depends on the amplitude of oscillations imposed on said network, the value of said impedance element determining the extent of phase-shaft imparted by said network, and means to apply said control voltage to said grid thereby to vary the amplitude of oscillations imposed on said network, whereby the frequency of said oscillations is varied in accordance with the instantaneous amplitude of said control voltage.
  • Apparatus for producing high-frequency oscillations whose frequency varies in accordance with the instantaneous amplitude of a control voltage comprising an electron discharge tube provided with a cathode, a grid and an anode, a resonant circuit coupled between said anode and said cathode, inductive means regeneratively coupling said resonant circuit to said grid to sustain high-frequency oscillations in said resonant circuit, means to apply the control voltage to said grid to vary the amplitude of said oscillations, and a phase-shifting network interposed between said anode and said resonant circuit and including an impedance element whose value determines the characteristics of said network and depends on the amplitude of oscillations applied thereto.
  • said network is constituted by a capacitor coupled between said anode and one end of said resonant circuit and a diode having an anode coupled to said one end of said resonant circuit and a cathode coupled to the other end thereof.

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  • Inductance-Capacitance Distribution Constants And Capacitance-Resistance Oscillators (AREA)
  • Generation Of Surge Voltage And Current (AREA)
  • Lasers (AREA)
  • Valve Device For Special Equipments (AREA)
US55262A 1947-10-24 1948-10-19 Circuit arrangement for producing a high-frequency oscillation Expired - Lifetime US2557188A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
NL135580 1947-10-24

Publications (1)

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US2557188A true US2557188A (en) 1951-06-19

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ID=19750432

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Application Number Title Priority Date Filing Date
US55262A Expired - Lifetime US2557188A (en) 1947-10-24 1948-10-19 Circuit arrangement for producing a high-frequency oscillation

Country Status (8)

Country Link
US (1) US2557188A (fr)
BE (1) BE485428A (fr)
CH (1) CH268708A (fr)
DE (1) DE809820C (fr)
ES (1) ES185661A1 (fr)
FR (1) FR973903A (fr)
GB (1) GB651945A (fr)
NL (1) NL70313C (fr)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1199596B (de) * 1961-03-03 1965-08-26 Riegg & Co G M B H Schwingungsgenerator fuer elektronische Musikinstrumente
DE1283927B (de) * 1966-09-15 1968-11-28 Standard Elektrik Lorenz Ag Frequenzmodulierbarer Oszillator

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2250526A (en) * 1937-03-02 1941-07-29 Telefunken Gmbh Oscillator control circuit
US2305262A (en) * 1941-06-30 1942-12-15 Edward H Lange Method and means for normalizing thermionic oscillators
US2321354A (en) * 1941-03-25 1943-06-08 Radio Patents Corp Electrical apparatus
US2361731A (en) * 1940-12-12 1944-10-31 Patents Res Corp Reactance system
US2378245A (en) * 1942-03-17 1945-06-12 Radio Patents Corp Variable frequency oscillator

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2250526A (en) * 1937-03-02 1941-07-29 Telefunken Gmbh Oscillator control circuit
US2361731A (en) * 1940-12-12 1944-10-31 Patents Res Corp Reactance system
US2321354A (en) * 1941-03-25 1943-06-08 Radio Patents Corp Electrical apparatus
US2305262A (en) * 1941-06-30 1942-12-15 Edward H Lange Method and means for normalizing thermionic oscillators
US2378245A (en) * 1942-03-17 1945-06-12 Radio Patents Corp Variable frequency oscillator

Also Published As

Publication number Publication date
BE485428A (fr)
FR973903A (fr) 1951-02-16
DE809820C (de) 1951-08-02
ES185661A1 (es) 1949-04-01
CH268708A (de) 1950-05-31
NL70313C (fr)
GB651945A (en) 1951-04-11

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