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US2784314A - Device for frequency division - Google Patents

Device for frequency division Download PDF

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Publication number
US2784314A
US2784314A US395726A US39572653A US2784314A US 2784314 A US2784314 A US 2784314A US 395726 A US395726 A US 395726A US 39572653 A US39572653 A US 39572653A US 2784314 A US2784314 A US 2784314A
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US
United States
Prior art keywords
resistance
frequency
voltage
circuit
cathode
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
US395726A
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English (en)
Inventor
Tangen Nils
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.)
Telefonaktiebolaget LM Ericsson AB
Original Assignee
Telefonaktiebolaget LM Ericsson AB
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.)
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Publication date
Application filed by Telefonaktiebolaget LM Ericsson AB filed Critical Telefonaktiebolaget LM Ericsson AB
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Publication of US2784314A publication Critical patent/US2784314A/en
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Expired - Lifetime legal-status Critical Current

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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
    • H03B19/00—Generation of oscillations by non-regenerative frequency multiplication or division of a signal from a separate source
    • H03B19/06—Generation of oscillations by non-regenerative frequency multiplication or division of a signal from a separate source by means of discharge device or semiconductor device with more than two electrodes
    • H03B19/08—Generation of oscillations by non-regenerative frequency multiplication or division of a signal from a separate source by means of discharge device or semiconductor device with more than two electrodes by means of a discharge device
    • H03B19/12—Generation of oscillations by non-regenerative frequency multiplication or division of a signal from a separate source by means of discharge device or semiconductor device with more than two electrodes by means of a discharge device using division only

Definitions

  • the present invention relates to a frequency divider comprising an electron tube with a cathode, a control grid and an anode, and at least one further grid, an oscillating circuit with a low Q-value being connected between the control grid and the cathode and in series with the source of voltage, the frequency of which is to be divided, said oscillating circuit being approximately tuned to the desired frequency, and arranged to be fed through a feed-back path from the further grid and the cathode, all the electrodes being series connected with large resistances.
  • the Q-value is the inverted value of the ratio of resistance to reactance for an inductor and may be expressed by the equation:
  • a device is characterized by the input circuit of the electron tube being arranged to be controlled by a relay which, should the voltagefed to the electron tube from the source of voltage fall below a determined value, short circuits by means of its contacts the series connection of part of the resistance connected to the control grid, the oscillating circuit and the input circuit of the electron tube.
  • the object of the invention is to make the blocking of an electron tube working as an oscillator possible when a voltage connected to said valve and acting as a control voltage deviates a determined minimal magnitude with regard to the amplitude or the frequency without any sudden changes arising, which could cause disturbances of different kinds in for example large carrier frequency systems.
  • the impedance between the control grid and the cathode remaining after the relay has become deenergized is still so high, that a change in the direct currents of the electron tube is hardly noticeable.
  • the cathode 11 is connected to a terminal 18 over a cathode resistance 16 and a condenser 17 connected in parallel with said resistance.
  • the control grid 12 is con' nected to a terminal 19 over a resistance 20 and an oscillating circuit 2124.
  • the terminals 18 and 19 represent the input circuit of the electron valve 1.
  • the oscillating circuit 2124 comprises a condenser 24 and a coil 21 connected with said condenser, said coil constituting one of the windings of a transformer 2, the other winding of which is indicated by 22 on the drawing.
  • an adjust-I able resistance 23 one of the terminals of which is con-' nected to the screen grid 13, and the other terminal of which is series connected to the terminal 18 through 25.
  • An anode battery 27, the positive pole of which" is connected to the anode 15 over a resistance 28, is connected in parallel with the condenser 26, the anode 15 in its turn being connected to one of the output terminals 30 of the device over a condenser 29.
  • the other output terminal 31 of the device is connected to the negative pole of the anode battery 27.
  • the suppressor grid 14 is directly connected to the cathode 11.
  • a rectifier bridge 208 with four rectifying elements is connected between the terminals 18 and 19 and is arranged to feed the coil of a relay 207, which has two break contacts, 203 and 204.
  • the stationary element of the break con tact 203 is connected to the terminal 18 and its movable elements to a tap on the resistance 20. Said last mentioned tap is suitably chosen so that the two parts 201 and 202 of the resistance are approximately equal, that is the part between the oscillating circuit 21-24 and the terminal comprises about half the resistance 20.
  • the break contact 204 is comprised in a series circuit further comprising a battery 206 and an alarm device 205.
  • a crystal oscillator K0 is connected over a filter F to the input circuit of the electron valve 1.
  • the oscillating circuit 21-24 is presumed to be tuned approximately to the desired frequency.
  • the circuit must have a large L/C-relation, L being the inductance of the winding 21 and C the capacitance of the condenser 24, and a small Q-value. If the crystal controlled oscillator KO emits a sinusoidal negative voltage with the frequency in and a frequency fo/n is desired, n being an integer, the oscillating circuit must be tuned approximately to fo/n.
  • the crystal oscillator KO When the crystal oscillator KO emits a voltage with a suitable frequency and amplitude, it controls the tube 1 working as an oscillator, said tube in its output circuit giving a voltage with such a frequency, as is a sub multiple of the frequency of the crystal oscillator.
  • the coil of the relay 207 is thereby energized and the contacts 203 and 204 are broken.
  • the relay 207 becomes deenergized, the contact 203 thereby short-circuiting the series connection of part of the resistance 20 connected to the control grid, the oscillat ing circuit 2124 and the input circuit 18-19 of the electron tube 1, and the contact 204 connects the alarm device 205 to the battery 206.
  • a frequency divider system for dividing the frequency of a source of voltage comprising, in combina tion, electron tube means including a cathode, a control grid, an anode and at least one additional grid, input circuit means for said tube means, oscillating circuit means connected between said control grid and said cathode and including in series the source of voltage the frequency of which is divided, said oscillating circuit means having a low Q-value and being approximately tuned to the desired frequency, feed-back circuit means Patented Mar.
  • a frequency divider system according to claim 1, wherein said part of the resistance means connected to the control grid constitutes about one half of the total resistance value of said resistance means.
  • a frequency divider system according to claim 1 and further comprising filter means having a narrow pass band included in the circuit connections between said source of voltage and said tube means.

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  • Measurement Of Resistance Or Impedance (AREA)
  • Inductance-Capacitance Distribution Constants And Capacitance-Resistance Oscillators (AREA)
US395726A 1952-12-19 1953-12-02 Device for frequency division Expired - Lifetime US2784314A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
SE747276X 1952-12-19

Publications (1)

Publication Number Publication Date
US2784314A true US2784314A (en) 1957-03-05

Family

ID=20323263

Family Applications (1)

Application Number Title Priority Date Filing Date
US395726A Expired - Lifetime US2784314A (en) 1952-12-19 1953-12-02 Device for frequency division

Country Status (4)

Country Link
US (1) US2784314A (da)
BE (1) BE515857A (da)
FR (2) FR1067213A (da)
GB (1) GB747276A (da)

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2567286A (en) * 1946-12-05 1951-09-11 Hartford Nat Bank & Trust Co Device for automatic frequency correction
US2624005A (en) * 1947-03-04 1952-12-30 Hartford Nat Bank & Trust Co Stabilized crystal oscillator circuits

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2567286A (en) * 1946-12-05 1951-09-11 Hartford Nat Bank & Trust Co Device for automatic frequency correction
US2624005A (en) * 1947-03-04 1952-12-30 Hartford Nat Bank & Trust Co Stabilized crystal oscillator circuits

Also Published As

Publication number Publication date
BE515857A (da)
GB747276A (en) 1956-03-28
FR1067213A (fr) 1954-06-14
FR65874E (da) 1956-03-22

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