US2476392A - Ultra high frequency amplifying circuit - Google Patents

Ultra high frequency amplifying circuit Download PDF

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Publication number
US2476392A
US2476392A US728708A US72870847A US2476392A US 2476392 A US2476392 A US 2476392A US 728708 A US728708 A US 728708A US 72870847 A US72870847 A US 72870847A US 2476392 A US2476392 A US 2476392A
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US
United States
Prior art keywords
impedance
grid
cathode
high frequency
control grid
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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US728708A
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English (en)
Inventor
Strutt Maximiliaan Julius Otto
Ziel Aldert Van Der
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
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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 US2476392A publication Critical patent/US2476392A/en
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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
    • H03F3/00—Amplifiers with only discharge tubes or only semiconductor devices as amplifying elements
    • H03F3/50—Amplifiers in which input is applied to, or output is derived from, an impedance common to input and output circuits of the amplifying element, e.g. cathode follower
    • H03F3/52—Amplifiers in which input is applied to, or output is derived from, an impedance common to input and output circuits of the amplifying element, e.g. cathode follower with tubes only
    • 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 an ultra-high frequency amplifying circuit comprising a discharge tube which contains at least a cathode, a control grid and an output electrode and in which the oscillations to be amplified are supplied to an input impedance connected between the control grid and the cathode, whereas the amplified oscillations are obtained from an output impedance interposed between the output electrode and the control grid.
  • common cathode circuit In the case of high frequency amplifiers use is generally made of the so-called common cathode circuit, in which the input impedance is arranged between the control grid and the cathode and the output impedance between the output electrode and the cathode of the amplifier valve.
  • the output impedance between the output electrode and the control grid it may, however, be advantageous to arrange the output impedance between the output electrode and the control grid, the latter being connected, so far as high-frequency currents are concerned, to a point of constant potential (earth) such circuit arrangement being referred to as a common grid circuit.
  • part of the control grid circuit that does not form part of the high frequency connection between the output electrode and the cathode includes a predominantly capacitative impedance which is so proportioned that the damping produced by the tube on the input impedance is substantially neutralised.
  • the said predominantly capacitative impedance is preferably constituted by a Lecher line connected between the control grid and a point of constant potential.
  • a highly efiicient embodiment of the invention may be secured, if the said predominantly capacitative impedance is constituted by a condenser which is housed in the discharge tube and shunted by a leak resistance and which is connected by connections as short as possible on the one hand to the control grid and on the other hand to a tapping point, from which issue two current supply leads one of which is connected to the input impedance and the other to the output impedance.
  • Fig. 1 is a schematic circuit diagram of one embodiment of an amplifier in accordance with the invention.
  • Fig. 2 is a schematic circuit diagram of another embodiment of an amplifier in accordance with the invention.
  • Fig. 3 is a schematic circuit diagram of yet another embodiment.
  • Figure 1 shows an amplifier circuit for ultrahigh frequency oscillations which comprises an amplifier valve I.
  • This valve contains a cathode 2, a control grid 3, a screening grid 4, a suppressor grid 5 connected to the cathode, and an anode 6.
  • the control grid 3 and the cathode 2 have arranged between them an input impedance 1 to which the oscillations to be amplified are supplied, whereas the anode 6 and the controlgrid llhave connected between them an output impedance 8 from which the amplified oscillations are obtained.
  • the connecting point between the impedances 1 and 8 isearthed.
  • control grid 3 and earth have arranged between them a condenser 9 which is proportioned in such manner that the dampin produced by the tube on the input impedance I is substantially neutralised.
  • the condenser 9 must in practice have a capacity which is of the same order of magnitude as or several times higher than the control grid-cathode capacity.
  • Figure 2 shows an embodiment of the invention in which the condenser 9 is replaced by a Lecher line In whose length is chosen to be such that it has a capacitative input impedance.
  • the input impedance 1 and the output impedance 8 are also replaced by Lecher lines, which are designated II and I 2 respectively.
  • Figure 3 shows an embodiment of the invention in which the condenser is housed jointly with a leak resistance IS in the discharge tube and connected through short connecting wires on the one hand to the control grid 3 and on the other hand to a tapping point l4. From the tapping point issue two supply leads one of which leads to the input impedance (in the present case the Lecher line I I) and the other to the output impedance (in the present case the Lecher line 12).
  • a high frequency amplifying system comprising an electron discharge device having a cathode, a control grid, a screen grid and an anode, an'input impedance having one end connected to said cathode, an output impedance hav ing one end connected to said anode, the other ends of said impedances being interconnected, a predominantly capacitive impedance'..iconnected between said interconnection and said control grid and having a value substantially neutralizing the damping effect of saidldevice .on said innit impedance, and means effectivelycoupling said screen grid to ground.
  • a high frequency amplifying system comprising an electron discharge 'device having a cathode, a control grid, a screen gridand an anode, a tuned input impedanceeconnecting said cathode to ground, a tuned output impedance coupling said anode to ground, a predominantly capacitive impedance connecting said control grid to ground and having a value substantially neutralizing the dampingzreffectofi said device on said input impedanca'and. means:effectively coupling said'screen gridftoiground forhigh 'frequencies.
  • vlthe operating frequency and connected between said cathode and ground, an output Lecher line tuned'to' the operating frequency and connected -between said anode and ground, an auxiliary Lecher line having a length at which said line acts as a capacitance at the operating frequency, said auxiliary line. being-connected between said control grid and ground and having a capacitive value substantially neutralizing the damping efiect of said device on said input Lecher line, and means effecting by-passing said screen grid to ground at M the operating frequency.
  • .Anamplifying system adapted to operate at a high frequency comprising an electron discharge device including within an envelope a cathode, a control grid, a screen grid and an anodef an input impedance. connected between saidtcathode and said :controlvgridy-an output timpedance :connected between said; anode and said control :grid, a capacitor;connectedinyparallel with a grid leak disposed ,within. the envelope of said device andelectricallyinterposed" between said control grid landxsaid'input. and output impedances, said capacitor; having a .value I substantially neutralizing therdampingefiectofisaid device on said input impedance, and meansf'effectively by-passing said screen grid to ground at the operating frequency.

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Amplifiers (AREA)
US728708A 1944-09-02 1947-02-14 Ultra high frequency amplifying circuit Expired - Lifetime US2476392A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
NL2476392X 1944-09-02

Publications (1)

Publication Number Publication Date
US2476392A true US2476392A (en) 1949-07-19

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ID=19874336

Family Applications (1)

Application Number Title Priority Date Filing Date
US728708A Expired - Lifetime US2476392A (en) 1944-09-02 1947-02-14 Ultra high frequency amplifying circuit

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US (1) US2476392A (pt)
BE (1) BE465127A (pt)
FR (1) FR938014A (pt)

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2408355A (en) * 1942-01-29 1946-09-24 Rca Corp Concentric line oscillator

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2408355A (en) * 1942-01-29 1946-09-24 Rca Corp Concentric line oscillator

Also Published As

Publication number Publication date
BE465127A (pt)
FR938014A (fr) 1948-09-02

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