US2427241A - Push-pull circuit arrangement for ultra-short waves - Google Patents

Push-pull circuit arrangement for ultra-short waves Download PDF

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Publication number
US2427241A
US2427241A US480363A US48036343A US2427241A US 2427241 A US2427241 A US 2427241A US 480363 A US480363 A US 480363A US 48036343 A US48036343 A US 48036343A US 2427241 A US2427241 A US 2427241A
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Prior art keywords
circuit
push
ultra
resonant
pull
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Expired - Lifetime
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US480363A
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English (en)
Inventor
Johannes Marinus Van Hofweegen
Strutt Maximiliaan Julius Otto
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Hartford National Bank and Trust Co
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Hartford National Bank and Trust Co
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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

  • Patent expires May 19, 1961 3 Claims.
  • This movement relates to a circuit arrangement for ultra short waves, in which use is made of a resonant circuit substantially consisting of two juxtaposed and parallel conductors.
  • this drawback is avoided in push-pull circuit arrangements by taking care that the natural frequency of the system included in the input circuit, constituted by the parallel conductors jointly and the screening means, differs from the natural frequency of the corresponding system included in the output circuit.
  • I and 2 designate push-pull connected amplifying tubes whose control grids 3, 4 are respectively connected to the ends of a resonant circuit 5 consisting of two juxtaposed parallel conductors 5a, 5b and a movable short circuit bridge 50; the anodes 6, 1 are respectively coupled with the end of a resonant circuit 8 included in the output circuit of the arrangement, the last mentioned circuit being constituted by the parallel conductors 8a, 8b and the'short-circuit bridge 80 which is also movable.
  • Each of the resonant circuits 5 and 8 is surrounded by earthed screening means 9 and [0, respectively, to which one end of the conductors 5a, 5b and 8a, 8b, respectively, is electrically connected.
  • the oscillations to be amplified are supplied, for instance, through the intermediary of a coupling loop H having terminals [2, to the circuit 5 included in the input circuit of the arrangement, and the amplified oscillations may be derived in an analogous manner from the resonant circuit 8 interposed in the output circuit through the intermediary of a coupling loop I3 having terminals [4.
  • direct current feed voltages are supplied to the electrodes of the tubes 1 and 2; this has not been further illustrated, since it is not essential to the present invention.
  • the input circuit of the arrangement, as well as the output circuit comprises the resonant circuit 5 and 8, respectively, and in addition a resonant system constituted by the two parallel conductors 5a, 5b and 8a, 8b jointly, and the envelopes 9 and I0, respectively.
  • the tubes I and 2 are not connected in push-pull but in parallel, as a result of which the mutual conductance of this system is materially higher than that of the push-pull arrangement and oscillation of the ar rangement (for instance due to the control-grid anode capacity) may readily occur in the form of construction represented.
  • the frequency of the oscillations thus produced corresponds to the natural frequency of the resonant systems constituted by the resonant circuit conductors jointly and the screening means associated therewith.
  • these disturbing phenomena can be avoided by causing the natural freuqency of the system connected in the input circuit and constituted by the conductors 5a, 5b and the screening means 9 to differ from the natural frequency of the corresponding resonant system 8, 8a, 8b and I0 in the output circuit of the push-pull arrangement, which can be achieved in a simple manner, for instance by making the length ii of the shrielding envelope 9 different from the length l2 of the shielding envelope H), the construction and dimensions of the screened resonant circuit included in the input and output circuits being otherwise the same.
  • the invention applies not only to push-pull circuit arrangements for amplifying electrical oscillations but also, .for instance, to push-pull arrangements for producing or mixing electrical oscillations; in the last-mentioned case, for instance, in a superheterodyne receiving set, the resonant circuits constituted by the parallel conductors 5a, 5b and 8, 8a, 8b, will be tuned respectively to the frequency of the local oscillations and the frequency of the incoming oscillations,
  • a push-pull circuit arrangement for ultra short waves in which the input and output circuits each comprise a resonant circuit substantially consisting of two identically dimensioned juxtaposed and parallel conductors surrounded by metallic screening means, and in which the natural frequency of the system included in the input circuit and constituted by the parallel conductors jointly with the screening means is different from the natural frequency of the corresponding system included in the output circuit.
  • An ultra short Wave amplifier system comprising a pair of electron discharge devices each having an input electrode and an output electrode, a tuned lecher Wire circuit coupled to the input electrodes of said devices, and a tuned lecher Wire circuit coupled to the output electrodes of said devices, a shield surrounding each of said tuned lecher wire circuits, each shield being connected to the tuned circuit it surrounds and cooperating therewith to form a resonant system, said shields being sufficiently difierently dimensioned to cause said resonant systems to have different natural frequencies, whereby the occurrence of disturbing parasitics due to interacting between input and output circuits are avoided.
  • An ultra short Wave push-pull system cornallel conductors connected at one end to the 4 control grids of said devices, a short-circuiting slider bridging said conductors, a metallic sleeve-like shield surrounding said parallel conductors for substantially their entire length, a connection from ground to said shield, and another pair of parallel conductors connected at one end to the anodes of said devices, a shortcircuiting slider bridging said last pair of conductors, a metallic sleeve-like shield surrounding said last pair of parallel conductors, and a connection from said last shield to ground, said shields being diiferently dimensioned, whereby the natural frequency of the circuit comprisingthe first mentioned pair of parallel conductors jointly with their surrounding shield is difierent from the natural frequency of the circuit comprising the second mentioned pair of conductors jointly with their surrounding shield.

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Inductance-Capacitance Distribution Constants And Capacitance-Resistance Oscillators (AREA)
US480363A 1941-05-19 1943-03-24 Push-pull circuit arrangement for ultra-short waves Expired - Lifetime US2427241A (en)

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NL2427241X 1941-05-19

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2582726A (en) * 1943-03-27 1952-01-15 Hartford Nat Bank & Trust Co Mixing circuit arrangement
US2595997A (en) * 1943-10-27 1952-05-06 Hartford Nat Bank & Trust Co Receiver for short waves
US2735941A (en) * 1956-02-21 High frequency vacuum tube circuit

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2109843A (en) * 1933-08-31 1938-03-01 Kassner Ernst Eduard Wilhelm Apparatus for generating and applying ultrashort electromagnetic waves
US2141242A (en) * 1935-03-26 1938-12-27 Rca Corp Ultra short wave system
US2169305A (en) * 1935-06-15 1939-08-15 Rca Corp Low-loss circuits
US2216964A (en) * 1938-05-31 1940-10-08 Telefunken Gmbh Coupling system
US2236004A (en) * 1938-07-30 1941-03-25 Rca Corp Ultra high frequency signaling system

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2109843A (en) * 1933-08-31 1938-03-01 Kassner Ernst Eduard Wilhelm Apparatus for generating and applying ultrashort electromagnetic waves
US2141242A (en) * 1935-03-26 1938-12-27 Rca Corp Ultra short wave system
US2169305A (en) * 1935-06-15 1939-08-15 Rca Corp Low-loss circuits
US2216964A (en) * 1938-05-31 1940-10-08 Telefunken Gmbh Coupling system
US2236004A (en) * 1938-07-30 1941-03-25 Rca Corp Ultra high frequency signaling system

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2735941A (en) * 1956-02-21 High frequency vacuum tube circuit
US2582726A (en) * 1943-03-27 1952-01-15 Hartford Nat Bank & Trust Co Mixing circuit arrangement
US2595997A (en) * 1943-10-27 1952-05-06 Hartford Nat Bank & Trust Co Receiver for short waves

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Publication number Publication date
BE445613A (en))

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