US2118931A - Space discharge tube circuit - Google Patents

Space discharge tube circuit Download PDF

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Publication number
US2118931A
US2118931A US104193A US10419336A US2118931A US 2118931 A US2118931 A US 2118931A US 104193 A US104193 A US 104193A US 10419336 A US10419336 A US 10419336A US 2118931 A US2118931 A US 2118931A
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US
United States
Prior art keywords
grid
plate
resistance
capacity
circuit
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
US104193A
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English (en)
Inventor
Frederick B Llewellyn
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.)
AT&T Corp
Original Assignee
Bell Telephone Laboratories Inc
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 Bell Telephone Laboratories Inc filed Critical Bell Telephone Laboratories Inc
Priority to US104193A priority Critical patent/US2118931A/en
Priority to GB24151/37A priority patent/GB477270A/en
Priority to NL84343A priority patent/NL48409C/xx
Priority to FR827425D priority patent/FR827425A/fr
Application granted granted Critical
Publication of US2118931A publication Critical patent/US2118931A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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
    • 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

  • the present invention relates to the neutralization of the inherent interelectrode impedance of space discharge apparatus.
  • An object of the invention is an improved circuit that is capable of more complete compensation for the inherent interelectrode impedance than circuits of the prior art, particularly at very high frequencies.
  • cir cuits are provided which are capable of compensating or neutralizing the interelectrode coupling impedance, including both the capacity and resistance components.
  • Fig. 1 is a diagram of an equivalent circuit which applicant has worked out for the general case of a triode
  • Fig. 2 is a schematic circuit diagram of one form of circuit for carrying out the invention
  • Fig. 3 is a similar diagram of an alternative form for carrying out the invention.
  • Fig. 1 is self-explanatory, the feature of chief interest being that the impedance branch connecting the grid and plate contains not only the 5 inherent capacity Cgp as heretofore assumed but also a resistance component Tgp which is in series with Cgp and which is negative in sign.
  • the other branches of the equivalent network are of the form that has been assumed heretofore with 10 the exception that a small positive resistance appears in series with the cathode-grid capacity.
  • tube H] has its grid and cathode connected to a tuned input circuit L1C1 and its plate and cathode connected to a tuned output circuit LzCz. Between grid and plate the capacity C and negative resistance Tgp are to be thought of as existing, as shown in Fig. 1.
  • a coil L3 and a positive resistance R3 are connected in series with each other and with a blocking condenser ll across the grid and plate.
  • the inductance L3 is made of the right value to resonate with C at the same frequency at which L1C1 and L202 resonate.
  • Resistance R3 is made equal to Tgp and is, as stated, opposite in sign to r
  • the anti-resonant combination L3,C is therefore resistanceless and offers practically infinite impedance between the grid and plate terminals. (The resistance R3 has been assumed to represent the actual resistance of the circuit branch L3,C11.)
  • R3 may be adjusted experimentally by applying an electromotive force of the operating frequency to the output terminals in the system of Fig. 2 and measuring the voltage produced across the input terminals. When both L3 and R3 are correctly adjusted this voltage will be zero. The procedure is to tune L3 first until the voltage is a minimum. Then adjust R3 to reduce it still further. It may be that L3 will require a slight readjustment, which again requires a change in R3, but these variations rapidly become smaller so that two resettings usually are sufiicient.
  • FIG. 3 An alternative circuit is shown in Fig. 3 employing a balancing method for neutralizing the inherent grid-to-plate coupling impedance.
  • the grid and cathode of tube ID are assumed to be connected to any suitable input wave source at terminals I5, l6.
  • a load circuit is to be connected to output terminals l1, 18.
  • the plate is connected through inductance coil Z1 to the positive pole of the plate battery l9, the negative pole of which is connected to the cathode.
  • the neutralizing connection includes an inductance Z2 in series with a capacity C and a negative resistance, these elements being connected between the cathode and grid, and the inductance Z2 having practically unity coupling with the coil Z1.
  • Condenser 25 may be used to tune the circuit Z1, Z2, 25 to the signal frequency.
  • the negative resistance can be of suitable type and is shown for illustration as a positive grid tube 20 in series with a positive resistance 2 I.
  • the grid 22 is made more positive than the anode 23, and the working range of the tube 20 is kept Within the limits of the well-known downwardly sloping or negative resistance portion of the characteristic corresponding to the condition that the flow of secondary emission electrons away from the plate exceeds the flow of primary electrons in the direction from the cathode to the plate.
  • Anode current is supplied to plate 23 through impedance 24.
  • the circuit elements are proportioned so that the instantaneous potential produced at point 26 due to a disturbance in potential of the plate of tube l9 sets up a potential through the elements C,
  • the resultant is zero reaction of the plate on the grid.
  • the system for compensating the inherent grid-to-plate coupling impedance Tgp Cgp contains a reactance element (coil L3 or condenser C) to compensate the capacity Cgp and an element (R3 or -
  • a system for compensating said inherent coupling comprising: coupling between the plate and grid circuits and including reactance to compensate the reactance component of the inherent coupling and an element to compensate the negative resistance component of the inherent coupling.
  • a system coupled between the grid and plate for compensating said inherent coupling comprising means for compensating the negative resistance component of said coupling impedance, in series with a reactance which compensates the capacity component.
  • a space discharge tube circuit for translating waves of many megacycles in frequency, said tube having a cathode, grid and anode, and possessing interelectrode coupling, means coupled between the plate and grid for neutralizing on the grid the potentials set up by voltage changes on the plate acting through said interelectrode coupling, said means comprising a reactance across which is developed a potential of a magnitude and phase to neutralize the potential due to the reactive component of said interelectrode coupling and a resistive element for neutralizing the potential due to the negative resistive component of said interelectrode coupling.

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Amplifiers (AREA)
US104193A 1936-10-06 1936-10-06 Space discharge tube circuit Expired - Lifetime US2118931A (en)

Priority Applications (4)

Application Number Priority Date Filing Date Title
US104193A US2118931A (en) 1936-10-06 1936-10-06 Space discharge tube circuit
GB24151/37A GB477270A (en) 1936-10-06 1937-09-03 Space discharge tube circuit
NL84343A NL48409C (enrdf_load_stackoverflow) 1936-10-06 1937-09-30
FR827425D FR827425A (fr) 1936-10-06 1937-10-02 Circuits de tubes à décharge spatiale

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US104193A US2118931A (en) 1936-10-06 1936-10-06 Space discharge tube circuit

Publications (1)

Publication Number Publication Date
US2118931A true US2118931A (en) 1938-05-31

Family

ID=22299150

Family Applications (1)

Application Number Title Priority Date Filing Date
US104193A Expired - Lifetime US2118931A (en) 1936-10-06 1936-10-06 Space discharge tube circuit

Country Status (4)

Country Link
US (1) US2118931A (enrdf_load_stackoverflow)
FR (1) FR827425A (enrdf_load_stackoverflow)
GB (1) GB477270A (enrdf_load_stackoverflow)
NL (1) NL48409C (enrdf_load_stackoverflow)

Also Published As

Publication number Publication date
FR827425A (fr) 1938-04-26
NL48409C (enrdf_load_stackoverflow) 1940-05-15
GB477270A (en) 1937-12-24

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