US2257570A - Neutralized system - Google Patents

Neutralized system Download PDF

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Publication number
US2257570A
US2257570A US224063A US22406338A US2257570A US 2257570 A US2257570 A US 2257570A US 224063 A US224063 A US 224063A US 22406338 A US22406338 A US 22406338A US 2257570 A US2257570 A US 2257570A
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United States
Prior art keywords
circuit
input
frequency
oscillations
output
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Expired - Lifetime
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US224063A
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English (en)
Inventor
Posthumus Klaas
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RCA Corp
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RCA Corp
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Publication date
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Publication of US2257570A publication Critical patent/US2257570A/en
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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
    • H03F1/12—Modifications of amplifiers to reduce detrimental influences of internal impedances of amplifying elements by use of attenuating means
    • H03F1/13—Modifications of amplifiers to reduce detrimental influences of internal impedances of amplifying elements by use of attenuating means in discharge-tube amplifiers
    • 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
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03G—CONTROL OF AMPLIFICATION
    • H03G3/00—Gain control in amplifiers or frequency changers
    • H03G3/20—Automatic control
    • H03G3/22—Automatic control in amplifiers having discharge tubes

Definitions

  • This invention relates to a high frequency amplifier comprising neutralizing condensers for.
  • the desired effect is obtained by tuning the conductors, by which one or more electrodes are connected to connecting points outside'the tube and whose inductance is not negligible for the oscillations to be amplified, to the frequency of the oscillations to be amplified, and by inserting a damping resistance in the conductor through which the input impedance and the neutralizing oondenser(s) are connected to the grid, said damping resistance being shunted by a short circuit for the oscillations to be amplified.
  • This short-circuit preferably consistsof the series connection of an inductance and a capacity which is tuned to the frequency of the oscillations to be amplified.
  • Figure 1 shows the diagram of connections of a well known neutralized amplifier comprising two push-pull connected discharge tubes.
  • Figure 2 is the substitution diagram of the arrangement shown in Figure 1.
  • Figure 3 shows the same diagram of connections but embodies the improvement according to the invention.
  • Figure 4 illustrates an improvement of the arrangement shown in Figure 3.
  • Figure 5 represents an arrangement compris-- ing an amplifying tube, according to the invention-
  • the cathode grid and anode of two push-pull connected discharge tubes are designated by K1, G1, A1 and K2, G2, A2 respectively.
  • an oscillatory circuit 3 to which are supplied the oscillations to be amplified and which is tuned to the frequency of the oscillations to be amplified.
  • a circuit 4 which is also tuned to the frequency of the oscillations to be amplified, is connected between the anodes A1 and A2 of the tubes l and 2.
  • the anodes A1 and A2 are connected to the grids G2 and G1 respectively through neutralizing condensers designated by C1 and C2.
  • the cathodes K1 and K2 are interconnected through a conductor 5.
  • the required feed sources are not represented in the drawings.
  • the plates of the neutralizing condensers connected to the anode can be provided in the immediate vicinity of the anode, so that the conductors connecting the anodes A1 and A2 to'the connecting points 01 and 02 may be made very short so as to have a negligible inductance to the oscillations to be amplified.
  • the conductors 1 connecting the grids. G1 and G2 to the connecting points P1 and P2 respectively, as well as the cathode connecting leads 5 usually have such a length that the inductances of these leads are not negligible in amplifying ultra high frequency oscillations.
  • Figure 2 shows the substitution diagram of the arrangement represented in Figure 1, wherein the condensers between the point G1, K1, A1 and G2, K2, A2 respectively represent the inter-electrode capacities of the tubes I and 2 respectively. whereas the inductances 5, l, 8 represent the connecting leads between the two cathodes K1, K2 between the grid G1 and the connecting point P1 and between the grid 2 and the connecting point P2.
  • the coil 20 in the grid supply conductor 1 of the tube l is coupled to a coil 22 inserted in the part of the conductor 5 between the point l4 and the cathode K1
  • the coil 20 in the grid supply conductor 8 of the tube 2 is coupled to a coil 22 inserted in the part of the conductor 5 between the point l4 and the cathode K2.
  • the maximum output energy is obtained by proportioning the coupling so that the coupling between the electrode supply conductors inside the tube is completely removed.
  • thismeasure consists in inserting a damping resistance inthei conductors"! and' 8 through which the input. impedance and the neutralizing. condensersare connected to the grids, said damping resistancebeing bridged by ashortcircuit for the oscillations" to. b amplified.
  • Figure 3 shows a. circuit arrangement according to the invention which substantially corresponds to the arrangement shown in Figure 1', but which embodies. the improvements constituting the obj ectsof the invention"
  • the conductor 1' between G1 and. P1 and conductor 8 between G2 and P2 include a series condenser 11 by means of which these conductors are tuned to the frequency of the. oscillations to be amplified.
  • these conductors comprise a damping resistance l9 which is bridged by ashort circuit for the oscillations. to be amplified.
  • This short circuit consists of'the series connection of an inductance 2B and a capacity 2
  • this detrimental influence is entirely or partly removed by providing that the inductance, which forms part of the circuiticonstituting. for the frequency to be amplified a short circuit of the damping resistance included in th grid cir-' cuit, is inductively coupled to the cathode lead.
  • Figure 4 shows one form of construction of an amplifying circuit according totheiinvention, wherein this arrangement. is used.
  • Each of the inductances is coupled. to an inductance 22 1
  • Figure-5- showsan amplifying arrangement according toltheinvention which differs from the arrangerrrent represented in Figure 4 in that there is provided only a single amplifying tube I.
  • the output. circuit 4 is connected between the anode and the cathode of the tube l and the grid is connected to one end of the input circuit 3 whose other end is connected through a neutralizing condenserCi to th anode. A point. on the input circuit 3 between the ends is connected to a point M of the cathode: conductor 5.
  • the electrode-supply conductors 5, II and I are tuned, when necessary, by means of condensers l5, l8 and ll to the frequency of the, oscillations to be amplified, and the grid con.- ductor, 1 comprises a, damping resistance ['9 which is bridged by the series connection of a coil 20 and a condenser 2
  • the coil 20 is inductively coupled to a coil 22 inserted in the cathodeconductor 5.
  • the coils 20 and 22 shown in Figures 3, 4, and 5 need only have a slnall self induction and will often consist only of a single turn.
  • Inanultra-high' frequency amplifying system an electron discharge tube having an input electrode, a cathode and an output electrode, a highfrequency' input circuit, a high frequency output circuit, means series tuned to the frequency of said input circuit connecting said input circuit to said input electrode, a damping resistance in series-With said means, means connecting said output circuit to said output electrode, neutralizing'means coupling said input and output electrodes, and a circuit series tuned to the frequencyof operation of said high frequency input circuit connecting said cathode to said high. frequency circuits.
  • an electron discharge tube having an input electrode, a cathode and an output electrode, a high frequency input circuit, a high frequency output circuit, means series tuned to the frequency of said input circuit connecting said input circuit to said input electrode, means connecting said output circuit to said output electrode, neutralizing means coupling said input and output electrodes, a circuit series tuned to the frequency of operation of said high frequency circuits connecting said cathode to said high frequency circuits and a coupling between said series tuned circuit and said means series tuned to the frequency of said input circuit.
  • a neutralized-amplifier comprising an electron discharge device having input and output electrodes including a cathode, high frequency input and output circuits connected with the input and output electrodes in said device respectively and aneutralizing circuit inter-connecting the said input and output electrodes, means for stabilizing said amplifier comprising means for tuning out the inductive reactance' in a connection between said circuits and an electrode of said device, means for reducing voltages of frequencies difierent than the frequency of operation of said circuits including a damping resistance in said connection and a circuit series tuned to the frequency of operation of said input and output circuits connected in shunt to said damping resistance.
  • a system as recited in claim 3 wherein the cathode of said device is connected to said circuits by a circuit series tuned to the frequency of operation of said circuit and wherein said last named series tuned circuit is coupled to the circuit in shunt to said damping resistance.
  • an electron discharge device having input and output electrodes including a cathode, high frequency input and output circuits connected with the input and output electrodes in said device respectively, a neutralizing circuit connected between said input and output electrodes, a portion of said neutralizing circuit connection being common to the connection of said input circuit to said input electrodes, means for stabilizing the operation of said amplifier comprising capacitive means in said common portion of said connections for tuning out the inductive reactance in said connections, means for reducing voltages of all frequencies different than the frequency of operation of said input and output circuits including a damping resistance in said common portion of said connections and a circuit series tuned to the frequency of operation of said input and output circuits connected in shunt to said damping resistance.
  • an electron discharge device having an input electrode, an output electrode, and a cathode, high frequency input and output circuits connected with the input and output electrodes in said device respectively, a circuit series tuned to the frequency of operation of said input and output circuits in a connection between said cathode and said input and output circuits, a neutralizing circuit connected between said input and output electrodes, a portion of said neutralizing circuit connection being common to the connection of said input circuit to said input electrode, means for stabilizing the operation of said amplifier comprising capacitive means in said common portion of said connections for tuning out the inductive reactance in said connections, means for reducing voltages of all frequencies different than the frequency of operation of said input and output circuits including a damping resistance in said common portion of said connections and a circuit series tuned to the frequency of operation of said input and output circuits connected in shunt to said damping resistance, and a coupling between said series tuned circuit in shunt to said damping resistance, and said series tuned circuit in said connection between the cathode of said

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Filters And Equalizers (AREA)
  • Microwave Amplifiers (AREA)
  • Amplifiers (AREA)
US224063A 1937-09-11 1938-08-10 Neutralized system Expired - Lifetime US2257570A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DEN41142D DE734230C (de) 1937-09-11 1937-09-11 Radioempfaenger mit Schwundausgleich

Publications (1)

Publication Number Publication Date
US2257570A true US2257570A (en) 1941-09-30

Family

ID=7348337

Family Applications (1)

Application Number Title Priority Date Filing Date
US224063A Expired - Lifetime US2257570A (en) 1937-09-11 1938-08-10 Neutralized system

Country Status (6)

Country Link
US (1) US2257570A (da)
BE (1) BE430082A (da)
DE (1) DE734230C (da)
FR (1) FR843184A (da)
GB (1) GB500790A (da)
NL (1) NL57282C (da)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7863978B1 (en) * 2009-09-11 2011-01-04 Harris Corporation RF amplifier system for neutralizing internal capacitance in a cavity

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7863978B1 (en) * 2009-09-11 2011-01-04 Harris Corporation RF amplifier system for neutralizing internal capacitance in a cavity

Also Published As

Publication number Publication date
NL57282C (da) 1946-04-15
BE430082A (da) 1938-10-31
DE734230C (de) 1943-04-10
GB500790A (en) 1939-02-15
FR843184A (fr) 1939-06-27

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