US2021103A - High frequency amplifier - Google Patents

High frequency amplifier Download PDF

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Publication number
US2021103A
US2021103A US650301A US65030133A US2021103A US 2021103 A US2021103 A US 2021103A US 650301 A US650301 A US 650301A US 65030133 A US65030133 A US 65030133A US 2021103 A US2021103 A US 2021103A
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United States
Prior art keywords
grid
capacity
cathode
plate
high frequency
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Expired - Lifetime
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US650301A
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English (en)
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Kapteyn Paul
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Individual
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Individual
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    • 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
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J21/00—Vacuum tubes
    • H01J21/20—Tubes with more than one discharge path; Multiple tubes, e.g. double diode, triode-hexode
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J2893/00—Discharge tubes and lamps
    • H01J2893/003—Tubes with plural electrode systems

Definitions

  • amplifier tubes may be used which fulfill to a very extensive degree the above requirements.
  • the invention is based on the recognition that the total of the detrimental capacities of each anode circuit, and accordingly-so far as the tube itself is concerned the total of the electrode capacities efiective between the anode and the cathode, should be kept small.
  • FIG. 1 shows the connection diagram of a high frequency amplifier according 40 to theinvention
  • Fig. 2 a cross section of the tubes used in this amplifier
  • Fig. 3 the diagram of another high frequency amplifier
  • Fig. 4 a cross section of a tube used in this amplifier
  • Fig. 5 the diagram of a high frequency amplifier in connection with an audion and a loud speaker. 5
  • the screen grid SGi is preferably disposed as far away as possible from the plate A1, in order to make the detrimental capacity between these two electrodes as small as possible.
  • a relatively large capacity between the screening grid SG1 and the grid Gr does not cause disturbance, because this capacity also enters into the tuning of the oscillatory circuit I.
  • Fig. 1 there is furthermore designated by 2 the plate resistance'of the'first stage, by 3 the grid resistance leak of the second stage, and by 4 the connecting coupling condenser.
  • the second stage the output of which is connected from one plate A2, for example, over a tuned transformer 5, possesses two detrimental capacities, viz., between the cathode K2 and thegrid G2 and between the grid G2 and the screening grid SG2, while the screening grid-platepcapacity. enters into the tuning of the output transformer and accordingly has no detrimental effect.
  • the dimensioning of the screening grid will also be of a given nature insofar as the screening grid cannot be approached to morethan a certain extent towards the plate.
  • capacities between the grid G1 and the screening gridSG1 between the gridG1and the space charge grid RG1, and between the space chargegrid RG1 and the cathode K1 are all without detrimental effect, and with the exception of one, 5 enter into the tuning of the oscillatory circuit I.
  • the capacities without detrimental effect are constituted by the capacity between the screening grid SG2 and the plate A2 and between the'space charge grid RG2 and the 10 adhered to perfectly strictly.
  • the amplifier system illustrated in Figures '1 to 4 including the coupling elements employedfor connecting purposes, may-convenientlybe arranged in a common vacuum space in the form at, of a multiple tube.
  • the oscillation tendency of the second stage depends, greatly on the loading of its grid and plate circuit, while on the other hand the amplification of the first tube is greatly 'depen'dent on non-capacity of its plate circuit and the following grid circuit,.it is desirable to increase.
  • the amplification of the first system as far as possible by lowering the effective grid-cathode capacity of- -the.second.stage, i.. e. atthe expense "of amplification on the part of the second stagei'ib
  • the amplification of the second stage is particularly diminished by the fact that the greater grid-cathode spacing necessary for lowering the capacity decreases the slope.
  • the small grid cathode spacing of the first stage then required acts only in a favourable manner, as the slope, and accordingly the amplification, of this stage is particularly great.
  • the high capacity which is caused by reason of the small spacing has no detrimental effect insofar as the same enters into the tuning capacity of the input oscillatory circuit.
  • Particular advantage is furthermore obtained by selecting the diameter of the cathode to be as large as possible, in order to obtain a large emissive surface. Since in this manner the capacity between grid and cathode is naturally considerably increased with the same grid and cathode spacing, merely the first system of the amplifier is, in accordance with the invention, furnished with a cathode of relatively large diameter, while for the second system there is employed a cathode of relatively small diameter.
  • an oscillatory circuit which consists of a coil 1 and a tuning condenser 8, and to which there is supplied the control energy for example by an aerial l2 through the medium of a coil l3.
  • This oscillatory circuit is connected to the grid G1 and the cathode K1 of the first tube of a two-stage amplifier, to the plate A1 of which is fed by the plate potential source Ea via the high resistance 2.
  • the plate is connected through the medium of a condenser 4 with the control grid G2 of the second stage, to
  • the cathode of this second system is designated K2. Both cathodes K1 and K2 are heated indirectly by the filaments '9 and H], which may be furnished with heating energy from an A. 0. main through a transformer II.
  • the plate A2 of the second stage is connected to the source Ea via a coil 5 coupled with an oscillatory circuit consisting of the coil 6 and the tuning condenser M which controls a further high frequency tube of any particular kind, or a detector, for example an audion.
  • screening grids SG1, SGz which in the known manner are biased with a D. C. potential.
  • the capacity between G2 and K2 is to be smaller than that between G1 and K1.
  • this is to be accomplished by the fact that the distance be- 10 tween G2 and K2 is made to be greater than between G1 and K1, or the fact that the diameter of K1 is made to be larger than that of K2, other conditions being the same.
  • each of said tubes having a cathode, a plate and. a control grid, the distance between cathode and control grid in the second tube being larger and therefore the capacity between said electrodes being smaller than in the first tube.
  • each of said tubes having a cathode, a plate and a control grid, the diameter of the cathode in the second tube and therefore the capacity between cathode and control grid being smaller than in the first tube.
  • the first tube having a screen-grid, the screen-grid-plate capacity being very small, the control-grid-plate capacity of the second tube being smaller than that of the first tube.
  • a resonance-circuit being connected to the control grid of the first tube and another resonance circuit being connected to the plate of the second tube.
  • a resonance-circuit being connected to the control grid of the first tube and another resonance circuit being connected to the plate of the second tube, both tubes together with the coupling-members being mounted in a common vacuum vessel.

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Amplifiers (AREA)
US650301A 1931-02-16 1933-01-05 High frequency amplifier Expired - Lifetime US2021103A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE731114X 1931-02-16

Publications (1)

Publication Number Publication Date
US2021103A true US2021103A (en) 1935-11-12

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ID=27080850

Family Applications (1)

Application Number Title Priority Date Filing Date
US650301A Expired - Lifetime US2021103A (en) 1931-02-16 1933-01-05 High frequency amplifier

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US (1) US2021103A (fr)
FR (1) FR731114A (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3157040A1 (fr) * 2010-10-05 2017-04-19 Advanced Fusion Systems LLC Circuit intégré haute tension haut courant à vide

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US9711287B2 (en) 2009-01-23 2017-07-18 Advanced Fusion Systems Llc High voltage high current vacuum integrated circuit
EP3157040A1 (fr) * 2010-10-05 2017-04-19 Advanced Fusion Systems LLC Circuit intégré haute tension haut courant à vide

Also Published As

Publication number Publication date
FR731114A (fr) 1932-08-27

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