GB675766A - Improvements in suppression of spurious oscillations in electron discharge devices - Google Patents

Improvements in suppression of spurious oscillations in electron discharge devices

Info

Publication number
GB675766A
GB675766A GB4695/49A GB469549A GB675766A GB 675766 A GB675766 A GB 675766A GB 4695/49 A GB4695/49 A GB 4695/49A GB 469549 A GB469549 A GB 469549A GB 675766 A GB675766 A GB 675766A
Authority
GB
United Kingdom
Prior art keywords
tube
anode
oscillations
magnetic field
grid
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
GB4695/49A
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.)
Allen B du Mont Laboratories Inc
Original Assignee
Allen B du Mont Laboratories Inc
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 Allen B du Mont Laboratories Inc filed Critical Allen B du Mont Laboratories Inc
Publication of GB675766A publication Critical patent/GB675766A/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J21/00—Vacuum tubes
    • H01J21/02—Tubes with a single discharge path
    • H01J21/18—Tubes with a single discharge path having magnetic control means; having both magnetic and electrostatic control means
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J25/00—Transit-time tubes, e.g. klystrons, travelling-wave tubes, magnetrons
    • H01J25/68—Tubes specially designed to act as oscillator with positive grid and retarding field, e.g. for Barkhausen-Kurz oscillators
    • 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
    • H03B9/00—Generation of oscillations using transit-time effects
    • H03B9/01—Generation of oscillations using transit-time effects using discharge tubes
    • H03B9/02—Generation of oscillations using transit-time effects using discharge tubes using a retarding-field tube
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03F—AMPLIFIERS
    • H03F1/00—Details of amplifiers with only discharge tubes, only semiconductor devices or only unspecified devices as amplifying elements
    • H03F1/08—Modifications of amplifiers to reduce detrimental influences of internal impedances of amplifying elements
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03K—PULSE TECHNIQUE
    • H03K4/00—Generating pulses having essentially a finite slope or stepped portions
    • H03K4/06—Generating pulses having essentially a finite slope or stepped portions having triangular shape
    • H03K4/08—Generating pulses having essentially a finite slope or stepped portions having triangular shape having sawtooth shape
    • H03K4/10—Generating pulses having essentially a finite slope or stepped portions having triangular shape having sawtooth shape using as active elements vacuum tubes only
    • H03K4/26—Generating pulses having essentially a finite slope or stepped portions having triangular shape having sawtooth shape using as active elements vacuum tubes only in which a sawtooth current is produced through an inductor
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03K—PULSE TECHNIQUE
    • H03K4/00—Generating pulses having essentially a finite slope or stepped portions
    • H03K4/06—Generating pulses having essentially a finite slope or stepped portions having triangular shape
    • H03K4/08—Generating pulses having essentially a finite slope or stepped portions having triangular shape having sawtooth shape
    • H03K4/10—Generating pulses having essentially a finite slope or stepped portions having triangular shape having sawtooth shape using as active elements vacuum tubes only
    • H03K4/26—Generating pulses having essentially a finite slope or stepped portions having triangular shape having sawtooth shape using as active elements vacuum tubes only in which a sawtooth current is produced through an inductor
    • H03K4/28—Generating pulses having essentially a finite slope or stepped portions having triangular shape having sawtooth shape using as active elements vacuum tubes only in which a sawtooth current is produced through an inductor using a tube operating as a switching device
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B15/00—Suppression or limitation of noise or interference

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Power Engineering (AREA)
  • Details Of Television Scanning (AREA)

Abstract

675,766. Electric discharge tubes. DU MONT LABORATORIES, Inc., A. B. Feb. 21, 1949 [Feb. 21, 1948; Feb. 8, 1949], Nos. 4695/49 and 4696/49. Class 39 (i). [Also in Group XL (b)] In an electronic amplifier circuit in which periodic negatively-polarized pulses appearing at the anode of a thermionic tube give rise to Barkhausen oscillations, the oscillations are suppressed by a magnet so positioned as to provide a magnetic field having a component transverse to a path for electrons in the tube. Fig. 1 shows a television beam deflection tube having a cathode 1, a control grid 2, an accelerating grid 3, beam forming plates 4 and an anode 5. When this tube is used as a horizontal deflection amplifier tube, the accelerating grid 3 is positively charged and the voltage wave 9 applied to the control grid has sharp negative pulses 20 which momentarily render the tube non-conducting and cause the current in the inductive anode circuit to render the anode voltage 19 periodically negative as indicated at 22, giving rise to Barkhausen-Kurz oscillations. The provision of a magnetic field as indicated, is stated to prevent the build-up of these oscillations by bending the path of the electrons so that as they reverse their direction of travel they are easily attracted to the positivelycharged grid 3. In Fig. 1 and Figs. 3, 4 (not shown), an external permanent magnet may provide the field, whilst in Fig. 2 (not shown), a current-carrying coil is arranged about the tube. Alternatively, the source of the magnetic field may be provided internally by permanently magnetizing the beam-forming plates 4, Fig. 5 (not shown), or by securing bar magnets to the anode 5, Fig. 6 (not shown). It is also suggested that the magnetic field could be provided by locating the tube adjacent the focusing coils for the cathode-ray tube in the television receiver.
GB4695/49A 1948-02-21 1949-02-21 Improvements in suppression of spurious oscillations in electron discharge devices Expired GB675766A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US675766XA 1948-02-21 1948-02-21

Publications (1)

Publication Number Publication Date
GB675766A true GB675766A (en) 1952-07-16

Family

ID=22076952

Family Applications (1)

Application Number Title Priority Date Filing Date
GB4695/49A Expired GB675766A (en) 1948-02-21 1949-02-21 Improvements in suppression of spurious oscillations in electron discharge devices

Country Status (3)

Country Link
FR (1) FR993637A (en)
GB (1) GB675766A (en)
NL (1) NL82621C (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1002409B (en) * 1953-11-27 1957-02-14 Telefunken Gmbh Arrangement for frequency modulation of a high-frequency carrier
GB2213314A (en) * 1987-12-05 1989-08-09 English Electric Valve Co Ltd Gas discharge devices

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1002409B (en) * 1953-11-27 1957-02-14 Telefunken Gmbh Arrangement for frequency modulation of a high-frequency carrier
GB2213314A (en) * 1987-12-05 1989-08-09 English Electric Valve Co Ltd Gas discharge devices
US4954748A (en) * 1987-12-05 1990-09-04 Eev Limited Thyratron gas discharge device with magnetic field for improved ionization
GB2213314B (en) * 1987-12-05 1992-02-12 English Electric Valve Co Ltd Thyratrons

Also Published As

Publication number Publication date
FR993637A (en) 1951-11-05
NL82621C (en) 1956-09-15

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