US2312509A - Circuit for amplifying electric oscillations - Google Patents

Circuit for amplifying electric oscillations Download PDF

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Publication number
US2312509A
US2312509A US392202A US39220241A US2312509A US 2312509 A US2312509 A US 2312509A US 392202 A US392202 A US 392202A US 39220241 A US39220241 A US 39220241A US 2312509 A US2312509 A US 2312509A
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electrode
circuit
oscillations
cathode
output
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US392202A
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English (en)
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Ziel Aldert Van Der
Knol Kornelis Swier
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    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03F—AMPLIFIERS
    • H03F3/00—Amplifiers with only discharge tubes or only semiconductor devices as amplifying elements
    • H03F3/54—Amplifiers using transit-time effect in tubes or semiconductor devices

Definitions

  • This invention relates to a circuit arrangement for amplifying electric oscillations, more particularly oscillations having a wavelength of less than 10 meters.
  • Fig. 1 shows-a known circuit arrangement which will serve to explain the present invention
  • Figs. 2, 3 and,4 are circuits which illustrate two,embodiments of the present comprises a discharge tube I having a cathode 2
  • control grid 3 a screening grid 4 and an output electrode 5, the screening grid 4 being given a high positive bias and'the outputjlectrode 5 a feeble positive or negative bias.
  • input impedancei to which the oscil-* lations tobeamplified are fed
  • out ⁇ put electrode 5 and the cathode 2 have interconnected between them an output impedance! from which the amplified oscillations are derived.
  • this known circuit is based on the fact that intermediate the screening grid 4 and the output electrode 5 is formed a space charge whosedensity is governed by the alternating voltage active at the .control grid.
  • This space charge-induces in the output electrode a corresponding positive image charge whose intensity depends on the alternating voltage operative at the controlgrid and gives rise to the occurrence.
  • this disadvantage is obviated by the use of a perforated output electrode and by the arrangement of .one or more fact that by reason oi the use of a perforated.
  • a negative output. damping in the arrangement shown in Fig. 2 may be due tothe following. If a high negative bias is ap- 5 plied to the electrode 5 all the electrons passed '10 meters are amplified this circuit arrangement 35 by the screening grid 4 will reverse their direction before't'he electrode 5. The reversing electrons form a space charge in front of the electrodei which induces a corresponding positive image charge in the electrode 5. If the bias of the electrode 5 is rendered less negative, then a part of the arriving electrons will be passed by the electrode 5 so that the said space charge is reduced and consequently a lower positive charge 'occurs in, the electrode 5.
  • the transit time of the electrons from the cathode to the space charge will be of the same order of magnitude as the period of the oscillations to beamplifled so that the transmis-- sion of the said current will be effected with at. noticeabletime lag.
  • the current will thus manifest a greater lag than 90, 1. e.. it will contain a component which is in antiphase with the voltage'appliedto the electrode.
  • This component v tions from a source II and the circuit I2 is amplification of ultra-high frequencies by means of a single tube.
  • FIG. 3 One example of this embodiment of the invention is shown in Fig. 3.
  • the electrode 8 is constructed as a screening grid and beyond it' is arranged an anode II which is connected to the cathode with the interposition of an oscillatory' circuit l2 tuned to the frequency of the oscillations to be amplified.
  • the singly amplified voltage across the circuit '1 is amplified once more in the part of the tube formed by the electrodes 5, 8 and l I so that a double amplified voltage can be derived from the circuit H.
  • circuit arrangement shown in Fig.3 may be .used as a mixing stage in a superheterodyne receiver.
  • Fig. 4 The circuit arrangement shown in Fig.3 may be .used as a mixing stage in a superheterodyne receiver.
  • a circuit arrangement for the amplification of ultra-high frequency oscillations comprising an electron discharge tube having at least a cathode, a control grid, a screen grid, at perforate output electrode and one or more additional electrodes disposed in the order named, means for impressing a high positive bias on the screen grid and the one or more additional electrodes, and means for impressing a negative or low positive bias on the output electrode.
  • a circuit arrangement for the amplification of ultra-high frequency oscillations comprising an electron discharge tube having atleast a and an imperforate output electrode, an input with respect to said high frequency oscillations.
  • a circuit arrangement for the successive amplification of ultra-high frequency oscillations, ,particularly oscillations having a wave length less than 10 meters, comprising an electron discharge tube having arranged in the order named at least a cathode, a control grid, a screen grid, a perforate electrode, a second screen grid circuit tuned to the frequency of the oscillations tobe amplified connected to the control grid,
  • second and third circuits tuned to the same 'frequency as, the input circuit connected respectively to the perforate and imperforate electrodes, meansfo'r impressing a high positive 'biason the screen grids and the imperforate output electrode, means for impressing a negative or low positive bias on the perforate electrode, and means for connecting the screen grids to ground ALDERT VAN DER, ZIEL.

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Amplifiers (AREA)
US392202A 1940-06-04 1941-05-07 Circuit for amplifying electric oscillations Expired - Lifetime US2312509A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
NL2312509X 1940-06-04

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US2312509A true US2312509A (en) 1943-03-02

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US392202A Expired - Lifetime US2312509A (en) 1940-06-04 1941-05-07 Circuit for amplifying electric oscillations

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US (1) US2312509A (enrdf_load_stackoverflow)
NL (2) NL59722C (enrdf_load_stackoverflow)

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NL59722C (enrdf_load_stackoverflow)
NL98015B (enrdf_load_stackoverflow)

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