US2444864A - High-frequency tuned amplifying circuit - Google Patents

High-frequency tuned amplifying circuit Download PDF

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Publication number
US2444864A
US2444864A US480199A US48019943A US2444864A US 2444864 A US2444864 A US 2444864A US 480199 A US480199 A US 480199A US 48019943 A US48019943 A US 48019943A US 2444864 A US2444864 A US 2444864A
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United States
Prior art keywords
input
cathode
circuit
grid
capacity
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
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US480199A
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English (en)
Inventor
Ziel Aldert Van Der
Strutt Maximiliaan Julius Otto
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.)
Hartford National Bank and Trust Co
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Hartford National Bank and Trust Co
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 Hartford National Bank and Trust Co filed Critical Hartford National Bank and Trust Co
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Publication of US2444864A publication Critical patent/US2444864A/en
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Expired - Lifetime legal-status Critical Current

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    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03G—CONTROL OF AMPLIFICATION
    • H03G1/00—Details of arrangements for controlling amplification
    • H03G1/04—Modifications of control circuit to reduce distortion caused by control
    • 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
    • H03F1/10—Modifications of amplifiers to reduce detrimental influences of internal impedances of amplifying elements by use of amplifying elements with multiple electrode connections

Definitions

  • the invention relates to a circuit arrangement for transmitting high frequency electrical oscillations with the aid of a discharge tube which comprises an input electrode with a regulable bias voltage and whose input circuit comprises an oscillatory circuit tuned to the frequency of the oscillations to be transmitted, said oscillatory circuit being hereinafter referred to as input circuit.
  • the cathode alternating current sets up across this resistance a voltage which is, at least approximately, in phase with the input alternating voltage set up at the input electrode and which depends on the value of the mutual conductance of the tube and therefore on the bias voltage of the input electrode.
  • the voltage set up across the resistance causes in its turn a current flowing from the cathode to the input electrode through the natural capacity between these two electrodes, which current is also dependent on the bias voltage of the input electrode and leads by about 90 with respect to the input alternating voltage.
  • This current may be considered to be a result of a negative capacity which is apparently present between the input electrode and the cathode and whose value depends on the bias voltage of the input electrode,
  • the undesired damping variations above referred to may also be suppressed by providing an ohmic resistance which is not short circuited for high frequencies in that part of the cathode lead which is common to the input and output circuits.
  • the ohmic resistance must have for this purpose a higher value than is required for the compensation of the capacity variations.
  • the suppression of the damping variations is facilitated, however, by providing in parallel with the ohmic resistance a capacity whose impedance for the frequencies to be transmitted is at least of the order of magnitude of the ohmic resistance.
  • this drawback may be obviated by utilizing a discharge tube whose cathode is provided with two separated supply conductors and is connected for high frequencies through the intermediary of one of these supply conductors, referred to hereinafter as the input supply conductor, to the input electrode and through the intermediary of the other supply conductor, referred to hereinafter as the output supply conductor, to the output electrode.
  • a system comprising a discharge tube provided with at, least two separated cathode supply conductors
  • compensation of the variations of the input capacity and/or of the input damping of the discharge tube which occur upon variation of the bias voltage of the input electrode is rendered possible by connecting the cathode for high frequencies to a positive auxiliary electrode present in the tube, via the input supply conductor and via an ohmic resistance which is arranged in series with the input supply conductor and which is not short circuited for high frequencies, that end of the said ohmic resistance which is remote from the cathode being connected to that end of the input circuit which is remote from the input electrode.
  • the drawing represents a discharge tube i comprising a cathode 2, an input electrode (control grid) 3, a positive auxiliary electrode (screen grid) 4 and an output electrode (anode) 5.
  • the control grid 3 is connected to an input circuit 6 which is tuned to the oscillations to be transmitted whilst the anode circuit comprises an output circuit 7 which is also tuned to the oscillations to be transmitted.
  • the cathode 2 is provided with two separated supply conductors, viz, an input supply conductor 8 through the intermediary of which the oathode is connected for high frequencies to the control grid 3, and an output supply conductor 9 through the intermediary of which the cathode is connected, for high frequencies, to the anode 5.
  • a variable bias voltage which may be generated, for example, in the usual manner by a control rectifier for automatic volume control.
  • the variations of the capacity and/or of the damping which occurs between the control grid and the cathode, which variations are produced upon variation of the bias voltage, are compensated owing to the fact that, for high frequencies, the screen grid 4 is connected to the cathode through the input supply conductor 8 and through a resistance H which is connected in series with the supply conductor and which is not short circuited for high frequencies, that end of the said resistance which is remote from the cathode being connected to that end of the input circuit 6 which is remote from the control grid.
  • the required value of the resistance ll lies in general between 50 and 500 ohms.
  • the compensation aimed at is brought about by the fact that the screen grid alternating current sets up across the resistance il a voltage which gives rise to a current flowing from the cathode to the control grid through the natural capacity between the control grid and the cathode.
  • a capacity l2 whose impedance for the oscillations to be transmitted is at least of the order of magnitude of the resistance II. If only the variations of the input capacity have to be compensated, the capacity l2 may be suppressed.
  • a multi-electrode electron discharge device having electrodes include a cathode, a first grid, a second grid and an anode in the order named, and which has associated therewith a circuit for varying the bias voltage on said first grid, means for supplying a positive direct current potential to said second grid, a parallel tuned input circuit and a parallel tuned output circuit, a pair of supply leads for said cathode, a connection from said first grid to one terminal of said input circuit, a connection from one of said cathode supply leads to the other terminal of said input circuit, said last connection including a resistor in series therewith which is unbypassed for high frequencies, a connection from said anode to one terminal of said output circuit, and a connection from the other cathode supply lead to the other terminal of said output circuit.
  • a multi-electrode electron discharg device having electrodes include a cathode, a first grid, a second grid and an anode in the order named, and which has associated therewith a circuit for varying the bias voltage on said first grid, means for supplying a positive direct current potential to said second grid, a parallel tuned input circuit and a parallel tuned output circuit, a pair of supply leads for said cathode, a connection from said first grid to one terminal of said input circuit, a connection from one of said cathode supply leads to the other terminal of said input circuit, said last connection including a resistor in series therewith which is unbypassed for high frequencies, said resistor having a value in the range between fifty and five hundred ohms, a condenser in shunt to.
  • said resistor whose impedance for energy of the operating frequency is at least of the order of magnitude of said resistor, a connection from said anode to one terminal of said output circuit, and a connection from the other cathode supply lead to the other terminal of said output circuit.
  • a multi-electrode electron discharge device having electrodes include a cathode, a first grid, a second grid and an anode in the order named, and which has associated therewith a circuit for varying the bias voltage on said first grid, means for supplying a positive direct current potential to said second grid, a parallel tuned input circuit and a parallel tuned output circuit, a pair of supply leads for said cathode, a connection from said first grid to one terminal of said input circuit, a connection including a condenser in series therewith from one of said cathode supply leads to the other terminal of said input circuit, said last connection including a resistor in series therewith which is unbypassed for high frequencies, said resistor having a value in the range between fifty and five hundred ohms, a connection from said anode to one terminal of said output circuit, and a connection including a condenser in series therewith from the other cathode supply lead to the other terminal of said output circuit.

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Amplifiers (AREA)
  • Lasers (AREA)
US480199A 1940-12-30 1943-03-23 High-frequency tuned amplifying circuit Expired - Lifetime US2444864A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
NL605811X 1940-12-30

Publications (1)

Publication Number Publication Date
US2444864A true US2444864A (en) 1948-07-06

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ID=19787934

Family Applications (1)

Application Number Title Priority Date Filing Date
US480199A Expired - Lifetime US2444864A (en) 1940-12-30 1943-03-23 High-frequency tuned amplifying circuit

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US (1) US2444864A (en(2012))
DE (1) DE747584C (en(2012))
FR (1) FR878051A (en(2012))
GB (1) GB605811A (en(2012))
NL (1) NL57644C (en(2012))

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2550930A (en) * 1946-01-10 1951-05-01 Rca Corp High-frequency amplifier neutralization circuits
US2557178A (en) * 1948-04-21 1951-06-19 Hartford Nat Bank & Trust Co Input damping compensated amplifier
US2577746A (en) * 1944-11-11 1951-12-11 William R Faust Variable reactance decoupling circuit
US2872534A (en) * 1955-05-20 1959-02-03 Egyesuelt Izzolampa Interstage coupling circuits for high frequency multigrid voltage amplifiers
US3185887A (en) * 1961-03-20 1965-05-25 Tektronix Inc Deflection amplifier compensation linearizer circuit

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NL57644C (en(2012)) * 1940-12-30

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NL57644C (en(2012)) * 1940-12-30
US1878252A (en) * 1931-05-16 1932-09-20 Wired Radio Inc High frequency transmission system
US2066027A (en) * 1933-04-18 1936-12-29 Rca Corp Constant frequency generator
US2314958A (en) * 1939-07-25 1943-03-30 Ziel Aldert Van Der High frequency amplifier circuit

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1878252A (en) * 1931-05-16 1932-09-20 Wired Radio Inc High frequency transmission system
US2066027A (en) * 1933-04-18 1936-12-29 Rca Corp Constant frequency generator
US2314958A (en) * 1939-07-25 1943-03-30 Ziel Aldert Van Der High frequency amplifier circuit
NL57644C (en(2012)) * 1940-12-30

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2577746A (en) * 1944-11-11 1951-12-11 William R Faust Variable reactance decoupling circuit
US2550930A (en) * 1946-01-10 1951-05-01 Rca Corp High-frequency amplifier neutralization circuits
US2557178A (en) * 1948-04-21 1951-06-19 Hartford Nat Bank & Trust Co Input damping compensated amplifier
US2872534A (en) * 1955-05-20 1959-02-03 Egyesuelt Izzolampa Interstage coupling circuits for high frequency multigrid voltage amplifiers
US3185887A (en) * 1961-03-20 1965-05-25 Tektronix Inc Deflection amplifier compensation linearizer circuit

Also Published As

Publication number Publication date
GB605811A (en) 1948-07-30
DE747584C (de) 1944-08-23
NL57644C (en(2012))
FR878051A (fr) 1943-01-11

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