US2111702A - Circuit arrangement for amplifying electric oscillations - Google Patents

Circuit arrangement for amplifying electric oscillations Download PDF

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Publication number
US2111702A
US2111702A US90790A US9079036A US2111702A US 2111702 A US2111702 A US 2111702A US 90790 A US90790 A US 90790A US 9079036 A US9079036 A US 9079036A US 2111702 A US2111702 A US 2111702A
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US
United States
Prior art keywords
circuit arrangement
frequency
capacity
electric oscillations
anode
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
US90790A
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English (en)
Inventor
Strutt Maximiliaan Julius Otto
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.)
Koninklijke Philips NV
Original Assignee
Philips Gloeilampenfabrieken NV
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 Philips Gloeilampenfabrieken NV filed Critical Philips Gloeilampenfabrieken NV
Application granted granted Critical
Publication of US2111702A publication Critical patent/US2111702A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J19/00—Details of vacuum tubes of the types covered by group H01J21/00
    • H01J19/82—Circuit arrangements not adapted to a particular application of the tube and not otherwise provided for
    • 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
    • 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
    • H03F1/14—Modifications of amplifiers to reduce detrimental influences of internal impedances of amplifying elements by use of neutralising means
    • H03F1/16—Modifications of amplifiers to reduce detrimental influences of internal impedances of amplifying elements by use of neutralising means in discharge-tube amplifiers

Definitions

  • amplifying circuits comprising amplifying valves retroaction of the anode circuit on the control grid circuit which under certain conditions results in self oscillation 5 of the circuit.
  • amplifying valves retroaction of the anode circuit on the control grid circuit which under certain conditions results in self oscillation 5 of the circuit.
  • the retroaction of the anode circuit on the control grid circuit is not only due to the anode-control grid capacity but also to the mutual induction between the cathode lead and the conductors to the auxiliary grids and to the anode.
  • f designates the frequency of the oscillations to be amplified and A is a constant which is determined by the mutual induction between the supply conductors.
  • the equivalent capacity is composed of a positive constant part and a negative part depending on the frequency.
  • the constant'part of the equivalent capacity or that part which depends on the frequency is so adjusted that for 40 the frequency of the oscillations to be amplified the equivalent capacity is substantially zero.
  • the constant part Cago of the equivalent capacity may be controlled for example by a suitable choice of the screening between the control grid and the anode within the amplifying valve.
  • the part that depends on the frequency can be controlled by modifying the coupling between the supply conductors to the electrodes of the valve.
  • the single figure of the drawing shows schematically a tube arrangement used to explain in more detail the various features of the present invention.
  • a tube T is shown provided with an anode, a cathode and a control electrode.
  • the control electrode is connected to the cathode of the tube through an external circuit including the grid impedance Zg and the anode of the tube is shown connected to the cathode thereof through the plate impedance Zp.
  • M The mutual between the supply conductors is indicated by M and the capacity existing between the grid and plate is indicated by the label Cago.
  • the mutual M may be made so as to be equivalent to the capacity between the grid 20 and plate so as to produce an equivalent capacity which is substantially zero for any particular frequency which it is desired to amplify.
  • the circuit arrangement according to the invention is particularly important in connection with amplifiers that are always tuned to one and the same frequency, as is the case, for example, in television receiving sets.
  • the frequency at which the equivalent capacity is zero may be chosen so as to be equal to the frequency at which self-oscillation would be set up but for the use of the invention.
  • the method of eliminating at a predetermined desired frequency the coupling between the input and output circuits that occurs within the tube structure itself which comprises proportioning the grid-plate capacity of the tube and the mutual inductance between grid and plate leads 0 within the tube to produce equal and opposite a coupling effects at said frequency.

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Amplifiers (AREA)
  • Microwave Amplifiers (AREA)
US90790A 1935-07-26 1936-07-15 Circuit arrangement for amplifying electric oscillations Expired - Lifetime US2111702A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
NL474675X 1935-07-26

Publications (1)

Publication Number Publication Date
US2111702A true US2111702A (en) 1938-03-22

Family

ID=19786508

Family Applications (1)

Application Number Title Priority Date Filing Date
US90790A Expired - Lifetime US2111702A (en) 1935-07-26 1936-07-15 Circuit arrangement for amplifying electric oscillations

Country Status (5)

Country Link
US (1) US2111702A (fr)
BE (1) BE416639A (fr)
FR (1) FR808395A (fr)
GB (1) GB474675A (fr)
NL (1) NL46307C (fr)

Also Published As

Publication number Publication date
BE416639A (fr)
GB474675A (en) 1937-11-01
NL46307C (fr)
FR808395A (fr) 1937-02-04

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