US2105081A - Amplifying tube and circuit - Google Patents

Amplifying tube and circuit Download PDF

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Publication number
US2105081A
US2105081A US695401A US69540133A US2105081A US 2105081 A US2105081 A US 2105081A US 695401 A US695401 A US 695401A US 69540133 A US69540133 A US 69540133A US 2105081 A US2105081 A US 2105081A
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US
United States
Prior art keywords
grid
tube
anode
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
US695401A
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English (en)
Inventor
Jobst Gunther
Klotz Ernst
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.)
Telefunken AG
Original Assignee
Telefunken AG
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 Telefunken AG filed Critical Telefunken AG
Application granted granted Critical
Publication of US2105081A publication Critical patent/US2105081A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03G—CONTROL OF AMPLIFICATION
    • H03G3/00—Gain control in amplifiers or frequency changers
    • H03G3/20—Automatic control
    • H03G3/22—Automatic control in amplifiers having discharge tubes
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
    • H04B1/06—Receivers
    • H04B1/16—Circuits
    • H04B1/163—Special arrangements for the reduction of the damping of resonant circuits of receivers

Definitions

  • An object of this invention is to provide an amplier arrangement in which the damping of a load circuit connected in or coupled to the anode circuit may be fully or partly compensated for, preferably by the use of 'a certain type of vacuum tube as a negative resistance.
  • a further object is to provide an ampliiier arrangement in which the degree of amplification and the amount of damping compensation applied are independent of each other and may be independently controlled.
  • a still further object is to provide an amplifying ⁇ tube and arrangement in which the same tube not only serves as amplifier but has elements arranged therein to provide the desired negative resistance effect in the load circuit.
  • FIG 1 shows schematically the general amplifying arrangement according to the invention
  • Figure 2 shows an amplifier providing negative resistance by a feed-back method
  • Figures 3 and 4 show amplifiers in which the v negative resistance is provided by elements in the amplifying tube
  • Figure 5 shows a tube arrangement for providing the negative resistance effect desired according to our invention.
  • Figure 6 shows an embodiment of Vour invention as applied to an automatic volume control system.
  • the Value of the negative inner impedance is dependent upon the bias of the ⁇ control grid. Ihis signifies that at a change of the degree of amplification of a tube, obtained for instance by displacing the working point upon the characteristic curve by selecting a corresponding grid bias, the damping reduction of the anode circuit and thus the selectivity will also be subject to change.
  • the present invention provides a circuit and several elements suitable. for carrying out the same in which the degree of amplification and the damping reduction of an amplifier stage can be regulated entirely independent of each other.
  • cathodes, screen grids and anodes 'of tubes I2 and I5 have the same potential and this condition can be made useful by structurally combining the two tubes within the same bulb.
  • a suitable tube structure is schematically represented in Figure 3.
  • the action of the two control grids I3, I6 is separated to a full extent by means of the T-shaped screen grid ll, the body I8 of the T extending between the grids.V
  • the same problem can be solved by selecting the grids for the various purposes i. e., the supporting columns thereof of the same length as that Vof the cathode but shaping the two halves, as conditions may require, differently from each other (for instance by changing the pitch of the grid winding, or omitting the same entirely) sopas to control the different parts of the current path or electron stream from the common cathode in various manners.
  • control grid YI3 may have its bias controlled to regulate the amplification, just as the grid I3 of Fig. 2 may be controlled for the same purpose.
  • the grid I6 is so disposed spacially and its half towards the left has such a wide mesh as to render the electronic action of grids I3 and I6 substantially independent of each other.
  • the screen grid I'I being located between them also assists in preventing reaction between them.
  • Figure 5 shows a tube the left half of which serves as an ordinary screen grid tube for the amplication of radio frequency energy.
  • the right hand part of the anode 20 is perforated and a further electrode 2I is disposed in back yof the anode and placed at a higher potential than the latter thereby receiving the secondary electrons from the anode. Due to the secondary emission a dynatron eifect with falling characteristic and thus a damping reduction of the load circuit Iil, II is obtained.
  • the right half of the anode forms with the cathode a negative resistance which is shunted across the load circuit.
  • the screen grid I'I which screens the control grid from the anode may have a potential of about 50 volts applied toit, the anode 20 about 100 volts and the outermost electrode 2l Aabout 150 volts.
  • opposite the solid portion of 20 may be cut away or perforated.
  • Figure 6 shows such an embodiment by way of example.
  • Numeral I designates herein a combination tube the left half of which operates as a screen grid tube amplifying the signal oscillations supplied by the antenna 2 and supplying the same to the grid circuit of the rectifier tube 3.
  • the right half of tube I functions as a space charge grid tube ⁇ and is back coupled by means of coil 4 to inductance 5 inserted in the common anode circuit.
  • the damping reduction of the anode circuit and thus also the selectivity of the stage is thereby entirely independent of the control grid I3 circuit of tube I.
  • a resistance 1 is placed in series with the audio-frequency transformer 6.
  • the direct voltage drop produced in this resistance provides the grid bias of the control grid I3 of tube I and thereby regulates the degree of amplification of this tube.
  • Condenser 8 serves as a short circuitV path for the high-frequency and determines at the same time the time constant of the volume control performance.
  • the left half of the tube I is to be constructed as screen grid tube with a logarithmic characteristic so that the inner resistance of this electron current path assumes a constant positive value. This may be secured by a variable spacing between the successive turns of the grid wire.
  • An amplifying arrangement comprising a vacuum tube having a cathode, a control grid, an anode and a screen grid located between said control grid and anode, an input circuit connecting said cathode and control grid, a circuit connecting said cathode and anode including a resonantv circuit comprising a coil and condenser connected in parallel, means for applying a high positive potential to said screen grid, means for causing at least a portion of the electron path between cathode and anode to form a negative resistance connected in shunt with said resonant circuit comprising a second control grid and means coupling said last named gridto the circuit connecting said cathode and anode to thereby control the value of said negative resistance.
  • a vacuum tube having a cathode, an anode, a control grid located between said anode and cathode and constructed so as to control the electron current between one-half only of said cathode and anode, a second grid located between said anode and cathode and constructed so as to control the electron current between the other half only of said cathode and anode, means for varying the voltage of said control grid in accordance with a desired signal frequency, an output circuit connected to said anode and cathode, and means for varying the voltage of said second grid.
  • An amplifying arrangement comprising a ⁇ vacuum tube having a ⁇ cathode, a control grid arranged parallel to said cathode and an anode, an input circuit connecting said control grid and cathode, an output circuit connecting said cathode and anode, a second grid between said control grid and anode and arranged substantially parallel to said control grid, said control grid having v a wire of iiney mesh at one end of said cathode and of coarse mesh at the opposite end thereof and said second grid having a wire of coarse mesh at said one end of said cathode and of fine mesh at the opposite end thereof and means coupling said output circuit to said second grid.
  • a vacuum tube having a cathode, a control grid and an anode, an input circuit connecting said control grid and cathode, a second grid located between said control grid and anode, said second grid being constructed and arranged to control the electron stream from one end only of said cathode and said control grid being constructed and arranged to control the Velectron stream from the other end only of said cathode, means connected to said second grid for varying its potential at a high frequency, a screen grid located between said control grid and said second grid, means for applying a high positive potential to said screen grid and an output circuit connected between said anode and cathode.

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Amplifiers (AREA)
  • Circuits Of Receivers In General (AREA)
US695401A 1932-10-10 1933-10-27 Amplifying tube and circuit Expired - Lifetime US2105081A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE428285X 1932-10-10

Publications (1)

Publication Number Publication Date
US2105081A true US2105081A (en) 1938-01-11

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ID=6477444

Family Applications (1)

Application Number Title Priority Date Filing Date
US695401A Expired - Lifetime US2105081A (en) 1932-10-10 1933-10-27 Amplifying tube and circuit

Country Status (4)

Country Link
US (1) US2105081A (enrdf_load_stackoverflow)
FR (1) FR761326A (enrdf_load_stackoverflow)
GB (1) GB428285A (enrdf_load_stackoverflow)
NL (1) NL43907C (enrdf_load_stackoverflow)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3200257A (en) * 1960-03-30 1965-08-10 Ibm Tunnel diode switching circuit

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1156858B (de) * 1961-09-07 1963-11-07 Loewe Opta Ag Rueckgekoppelter Hochfrequenzverstaerker fuer Empfaenger fuer hochfrequente elektrische Schwingungen mit Halbleiterelementen, insbesondere Transistoren, mit selbsttaetig geregeltem Rueckkopplungsgrad
JPS61196625A (ja) * 1985-02-26 1986-08-30 Sony Corp オ−トダイン受信機

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3200257A (en) * 1960-03-30 1965-08-10 Ibm Tunnel diode switching circuit

Also Published As

Publication number Publication date
GB428285A (en) 1935-05-10
NL43907C (enrdf_load_stackoverflow)
FR761326A (fr) 1934-03-16

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