US2205233A - Oscillation generation - Google Patents

Oscillation generation Download PDF

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Publication number
US2205233A
US2205233A US215742A US21574238A US2205233A US 2205233 A US2205233 A US 2205233A US 215742 A US215742 A US 215742A US 21574238 A US21574238 A US 21574238A US 2205233 A US2205233 A US 2205233A
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US
United States
Prior art keywords
grid
condenser
oscillator
anode
circuit
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 - Lifetime
Application number
US215742A
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English (en)
Inventor
Jacob Van Slooten
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RCA Corp
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RCA Corp
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Filing date
Publication date
Application filed by RCA Corp filed Critical RCA Corp
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Publication of US2205233A publication Critical patent/US2205233A/en
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    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03L—AUTOMATIC CONTROL, STARTING, SYNCHRONISATION OR STABILISATION OF GENERATORS OF ELECTRONIC OSCILLATIONS OR PULSES
    • H03L5/00—Automatic control of voltage, current, or power
    • 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

  • thisobject is this kind a phenomenon occurs which is referred achieved by the arrangement of meanswhich in ,5 to hereinafter as over-oscillation or"blocking the case of an increase of the amplitude of theand which consists in that the oscillations set up oscillations produced bring about an additional by the-oscillator are periodically interrupted; In charge of a condenser included in the grid circuit. practice, this phenomenon often occurs with 0s- In one form of construction, these means comcillators serving for the productionof short waves.
  • circuits In order to decrease as far as possible the tend-, circuits includes a condenser which is shunted by.
  • FIG. 1 shows one form of construction of an nitude of the grid-cathode capacity which in oscillator according to the invention whose operseries with the grid condenser isincluded in-the ation will be more clearly understood by refer- 30 grid circuit in parallel with the highfrequency ence to the curves shown in Fig. 2.
  • FigsB, 4 and 5 show other forms of construcapplied to the grid.
  • This has the efiect of only tion of an oscillator according to the invention.
  • partof the retroactively coupling voltage supplied Fig. 1 shows an oscillator which contains a dis 135 to this impedance occurring across the grid and charge tube l comprising a cathode, a grid and: the amplitude of the oscillations set up by the an anode.
  • the frequency-determining circuit oscillator being consequently small.
  • the circuit hitherto described has a tendency 45, of longer waves. Since the impedance of the to over-oscillate, that is, block. In order to exfrequency-determining oscillatory circuit of' an plain the cause of this phenomenon, let usassume oscillator increases on the reception of short a givenposition of equilibrium at which the oswaves being switched over to aband of longer cill'ator setsup oscillations of constant amplitude. 5Q waves, the attenuating effect of the leak resist- In thispositioh of equilibrium, the grid condenser 50 ance on the oscillatory circuit increases.
  • This 5 is charged by-the grid current to a voltage which necessitates switching over of the leak resistance is higher negative than the voltage at which the on the reception of the band of longer waves to a anode current is suppressed in the absence of oshigher value, which renders the set complicated. cillations.
  • the condenser voltage determines the The invention has for its object to provide grid bias of the oscillator valve and thus the point passes through the diode I.
  • the effective mutual conductance ofthe oscillator valve increases, since the anode direct current increases to a higher extent than the amplitude of the oscillations generated. Due to the increasing mutual conductance of the oscillator valve,'the amplitude of the oscillations produced increases to a still higher extent, which in turn results in an increase of the mutual conductance. Thus the above-assumed position of equilibrium becomes unstable and this lack of stability is the cause of the phenomenon of over oscillation.
  • the grid-cathode space of the oscillator valve has connected in parallel with it a diode 'I-whose anode is connected to the grid of the tube I;
  • the condenser 5 due to the presence of the diode I, is charged by the grid current which increases with an increasing amplitude of the oscillations set 'up as well .as by the current that Consequently, in the case ofan increasing amplitude of the oscilla tions produced, the condenser 5 will have occurring across it an additional negative voltage which displaces the workingpoint of the characteristic curve to a point at which the mutual conductance is lower. In the circuit shown in Fig. 1, the effective mutual conductance would therefore increase, in the case of a deviation from the position of equilibriun -by reason of an increase in' the amplitude of the oscillations to be set up.
  • the additionalvoltage (i. e., the negative bias) across the condenser 5 would bring about a decrease of the efiective mutual conductance.
  • both a c t i o n s counteract each other, which avoids any disturbance in the position of equilibrium of the amplitude of the oscillations set up.
  • the diode 1 is arranged within the oscillator valve, since the latter comprises an additional electrode 8 arranged adjacent the control grid and the cathode of the oscillator valve.
  • This supplementary electrode 8 constitutes withthe cathode a diode which increases the current that passes through the grid circuit in the case of an in creasing amplitude of the oscillations set up, said current bringing about an additional charge of the condenser 5,
  • Fig. 4 that part of the cathode conductor which is common to the grid and the anode circuits includes a condenser 9 shunted by a choke coil I0.
  • the anode direct' current passes through the choke coil which constitutes a short 'circuit for the condenser.”
  • Fig. 5' In this circuit,
  • the condenser 9 becomes charged so that a negative voltage occurs across the condenser 9, said voltage being supplied to the grid of the valve I and displacing the working point of the oscillator valve to a point of less steepness.
  • the voltage which occurs across the condenser 9 in the case of a variation of the mean anode current is, however, supplied via a condenser 5 to the grid of the oscillator valve I.
  • a retroactively coupled oscillator comprising an electron discharge device containing a grid, an anode and a cathode, a frequency determining circuit having one terminalconnected to said grid through a grid condenser, a choke coil shunted by I a by pass condenser having one end connected to said cathode and the other end connected to the other terminal of said frequency determining circuit, a leak resistor connected between said grid and said last end of said choke coil, a connection from said anode also to said last end of said choke coil,- said connection being coupled to said frequencydetermining circuit for feeding back energy from said anode, said device considered together with said grid condenser and leak re-' sister functioning to bias said grid in proportion to the strength of oscillations, said Icy-pass condenser being a path of low impedance to energy of the operating frequency and the combination of said choke coil and Icy-pass condenser having high impedance to sudden changes in average current passing therethrough, whereby said combination of choke and by-
  • a retroactively coupled oscillator comprising an electron discharge device containing a grid, an anode and a cathode, a frequency determining circuit having one terminal connected to said grid through a grid condenser, a choke coil shunted by a by-pass condenser having one end connected to said cathode and the other end connected to the other terminal of said frequency determining circuit, a leak resistor connected be tween said grid and said last 0011, means for feeding back anode to said frequency determining circuit, said denser apply an additional bias to said grid in proportion'to the algebraic value of the rate 01" change of the oscillation amplitude.

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  • Inductance-Capacitance Distribution Constants And Capacitance-Resistance Oscillators (AREA)
US215742A 1937-09-02 1938-06-25 Oscillation generation Expired - Lifetime US2205233A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE209048X 1937-09-02

Publications (1)

Publication Number Publication Date
US2205233A true US2205233A (en) 1940-06-18

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ID=5794573

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US215742A Expired - Lifetime US2205233A (en) 1937-09-02 1938-06-25 Oscillation generation

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US (1) US2205233A (ja)
BE (1) BE429968A (ja)
CH (1) CH209048A (ja)
FR (1) FR842817A (ja)
NL (1) NL58852C (ja)

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2432227A (en) * 1943-08-24 1947-12-09 Westinghouse Electric Corp Pulsed oscillator
US2439286A (en) * 1944-02-16 1948-04-06 Rca Corp Oscillation generator
US2530427A (en) * 1945-09-14 1950-11-21 Fredrick Arden Hugo Stabilized frequency divider circuit
US2537696A (en) * 1945-09-14 1951-01-09 James P Palmer Stabilized frequency divider circuit
US2599964A (en) * 1945-09-14 1952-06-10 Us Navy Stabilized frequency divider circuit
US2681432A (en) * 1949-11-15 1954-06-15 Hydro Nitro S A Device for producing high-tension currents of low current intensity
US2823314A (en) * 1956-06-26 1958-02-11 F V Topping Oscillator circuit
US3230478A (en) * 1951-10-05 1966-01-18 Chester H Page Amplitude stabilizing circuit for electron tube oscillators

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
BE544351A (ja) * 1955-01-13
DE1079123B (de) * 1956-04-05 1960-04-07 Saba Gmbh Anordnung zur Amplitudenregelung von Hochfrequenz-Oszillatoren

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2432227A (en) * 1943-08-24 1947-12-09 Westinghouse Electric Corp Pulsed oscillator
US2439286A (en) * 1944-02-16 1948-04-06 Rca Corp Oscillation generator
US2530427A (en) * 1945-09-14 1950-11-21 Fredrick Arden Hugo Stabilized frequency divider circuit
US2537696A (en) * 1945-09-14 1951-01-09 James P Palmer Stabilized frequency divider circuit
US2599964A (en) * 1945-09-14 1952-06-10 Us Navy Stabilized frequency divider circuit
US2681432A (en) * 1949-11-15 1954-06-15 Hydro Nitro S A Device for producing high-tension currents of low current intensity
US3230478A (en) * 1951-10-05 1966-01-18 Chester H Page Amplitude stabilizing circuit for electron tube oscillators
US2823314A (en) * 1956-06-26 1958-02-11 F V Topping Oscillator circuit

Also Published As

Publication number Publication date
NL58852C (ja)
BE429968A (ja)
CH209048A (de) 1940-03-15
FR842817A (fr) 1939-06-20

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