US2616988A - Self-balancing push-pull amplifier - Google Patents

Self-balancing push-pull amplifier Download PDF

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Publication number
US2616988A
US2616988A US745616A US74561647A US2616988A US 2616988 A US2616988 A US 2616988A US 745616 A US745616 A US 745616A US 74561647 A US74561647 A US 74561647A US 2616988 A US2616988 A US 2616988A
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US
United States
Prior art keywords
circuit
push
anode
grid
pull
Prior art date
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Expired - Lifetime
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US745616A
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English (en)
Inventor
Rodenhuis Klaas
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 US2616988A publication Critical patent/US2616988A/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
    • H03F1/34—Negative-feedback-circuit arrangements with or without positive feedback
    • H03F1/36—Negative-feedback-circuit arrangements with or without positive feedback 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
    • H03F1/52—Circuit arrangements for protecting such amplifiers
    • H03F1/54—Circuit arrangements for protecting such amplifiers with tubes only
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03F—AMPLIFIERS
    • H03F3/00—Amplifiers with only discharge tubes or only semiconductor devices as amplifying elements
    • H03F3/26—Push-pull amplifiers; Phase-splitters therefor
    • H03F3/28—Push-pull amplifiers; Phase-splitters therefor with tubes only

Definitions

  • This invention relates to a circuit-arrangement for the transmission of electrical oscillations, more particularly of intermediate frequency and/or high-frequency oscillations, by means of at least two push-pull connected discharge systems, notably two discharge systems housed in a single bulb, of which the cathodes and the screen-grids, if any, are directly interconnected in pairs inside the bulb.
  • the direct voltages are each supplied, through one or more resistances, to the corresponding control grids.
  • l 1 j Each' of the aforesaid direct voltages'is preferably supplied'to a control gridof the corresponding discharge syfstem through a potentiometer which is connectedbetween the anode and the junction of the cathodes or a point ofconstant'potential (earth).
  • the undue positive nature of the voltage thus set up at the control-grids may be eliminated by inserting a resistance in the common cathodelead of the two discharge'systems, for'example, between the junction of the cathodes and the interconnected ends of the aforesaid potentiometers, the said resistance being proportioned in a manner such that the desired negative bias is set up at the control-grids of the discharge systems.
  • each of the anode circuits of the discharge systems includes a resistance and each ofthe direct voltages set up across these resistances and varying with the now be described more fully with reference to the accompanying drawing, in which one form of construction of the circuit-arrangement according to the invention is represented by way of example.
  • This drawing represents a circuit-arrangement for amplifying high-frequency oscillations by means of two push-pull connected discharge systems I, I each comprising a cathode 2', 2", a control-grid 3, 3", a screen-grid 4', 4", a suppressor 5', 5" and an anode fi', 6 respectively.
  • the two systems I, I" are housed in a single.
  • the suppressor grids 5, 5", screen grids 4', 4" and cathodes 2', 2 are interconnected in pairs inside the bulb, the suppressor grids being, moreover, directly connected to, the cathodes.
  • the two discharge systems may be so constructed as to have a common cathode.
  • A'push-pull circuit 7 which is tuned to the frequency of the oscillations to be amplified, is connected between the control grids 3 and 3".
  • This circuit comprises a variable condenser 8 and two coils 9, 9", the latter being interconnected through the series connection of two blocking condensers ID, ID".
  • the amplified oscillations may be obtained from an output circuit l l connected-in push-pull arrangement between the anodes 6, 6".
  • - push-pull circuit H is composed in the same 3 manner as the input circuit 7 and is constituted by a variable condenser l2, two coils l3, l3" and two blocking condensers l4, I4".
  • the centre of the push-pull circuits 1 and II (the junction of the blocking condensers I, I0" and I 4', l4" respectively) is earthed.
  • the cathode-lead includes a resistance [5 and. the screen-grid circuit comprises a resistance It.
  • circuit-arrangement so far described suffers, in general, from the drawback that very diiferent anode currents flow through the two discharge systems I and I", since, owing'to small disparities in construction, in contact potentials or in mutual conductances, the location of the working point of each discharge system may slightly vary. This is often undesirable, particularly if stringent requirements are imposed on the equilibrium of the output signal. It is therefore desirable to construct the push-pullcircuitarrangement in such manner that anode-current difierences are automatically neutralized.
  • each of the anode circuits includes a resistance IT, IT, at which direct voltages are set up which depend upon the anode current in question. Part of the direct voltage set up across resistance i1 and i7" respectively is supplied to the control-grid 3 and .3" respectively through a potentiometer I8 and 18f respectively.
  • the circuit-arrangement operates as follows: If for some reason the anode current of any of the discharge systems should exceed its normal value, the anode voltage falls ofi. Owing to this the potential of the associated control-grid decreases, so that the increase in anode current is counteracted by the decrease in control-grid voltage.
  • circuit-arrangement automatically seeks to maintain the anode current value once adjusted.
  • the potentiometer sets up a positive voltage at the control-grid.
  • the common cathode-lead includes the aforesaid resistance l5, through which the two anode currents flow.
  • the resistance has such a value that the voltage drop across this resistance sets up a positive potential at the. cathode, which is so much higher than that of the control-grids relatively to earth that the latter acquire the customary negative bias for the normal working point.
  • the factor f has a value of 0.25, i. e. twice as low as that generally obtained in the conventional circuitarrangement comprising resistances in the screengrid circuits, which means that the circuitarrangement operates twice as eifectively.
  • a push-pull amplifier comprising a pair of electron-discharge systems included in a common envelope, each system having a cathode, a grid and an anode, the cathodes of said systems being directly interconnected within said envelope; a push-pull input circuit including a condenser connected between the grids of said systems, a pairof inductors and a pair of by-pass capacitors, one end of each inductor being connected to a respectlve grid, the by-pass capacitors being connected in series between the other ends of said inductors, the junction of said by-pass capacitors being grounded; a push-pull output circuit including a condenser connected between the anodes of said systems, a pair of inductances and a pair of by-pass capacitances, one end of each inductance being connected to a respective anode, said by-pass capacitances being connected in series between the other ends of said inductances, the Junction of said by-pass capacitances being grounded
  • said means to apply the voltages acrosssaid resistors to said grids is constituted by a pair tentiometers being connected in series across said .of potentiometers, each having a tap, said poserially connected resistors, the tap of each I, potentiometer being connected to a respective 6 7 REFERENCES CITED
  • the following references are of record in the file of this patent:

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Magnetically Actuated Valves (AREA)
  • Control Of Indicators Other Than Cathode Ray Tubes (AREA)
  • Lasers (AREA)
US745616A 1946-03-30 1947-05-02 Self-balancing push-pull amplifier Expired - Lifetime US2616988A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
NL641948X 1946-03-30

Publications (1)

Publication Number Publication Date
US2616988A true US2616988A (en) 1952-11-04

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Family Applications (1)

Application Number Title Priority Date Filing Date
US745616A Expired - Lifetime US2616988A (en) 1946-03-30 1947-05-02 Self-balancing push-pull amplifier

Country Status (4)

Country Link
US (1) US2616988A (de)
DE (1) DE806558C (de)
FR (1) FR944141A (de)
GB (1) GB641948A (de)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2745907A (en) * 1951-05-03 1956-05-15 Gunter K Guttwein Tone control circuit
US2751444A (en) * 1952-05-21 1956-06-19 Ind Dev Engineering Associates Stabilizer for radio frequency amplifier
US2782266A (en) * 1954-08-30 1957-02-19 Rca Corp Volume control
US2806208A (en) * 1951-09-29 1957-09-10 Columbia Broadcasting Syst Inc Vacuum tube voltmeter
US2854530A (en) * 1953-02-23 1958-09-30 Philips Corp A. c.-biased amplifier circuit arrangement
US2901561A (en) * 1956-01-23 1959-08-25 Bendix Aviat Corp High frequency amplifier circuit

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2901557A (en) * 1955-02-07 1959-08-25 Bendix Aviat Corp Oscillator and amplifier circuit

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1998479A (en) * 1934-06-13 1935-04-23 Bell Telephone Labor Inc Push-pull amplifier
US2123241A (en) * 1937-08-05 1938-07-12 Bell Telephone Labor Inc Electric wave amplifier
US2154200A (en) * 1934-11-12 1939-04-11 Rca Corp Voltage regulator device
US2157870A (en) * 1936-08-21 1939-05-09 Bell Telephone Labor Inc High frequency circuit and apparatus
US2300133A (en) * 1940-09-20 1942-10-27 Bell Telephone Labor Inc Broad band amplifier

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1998479A (en) * 1934-06-13 1935-04-23 Bell Telephone Labor Inc Push-pull amplifier
US2154200A (en) * 1934-11-12 1939-04-11 Rca Corp Voltage regulator device
US2157870A (en) * 1936-08-21 1939-05-09 Bell Telephone Labor Inc High frequency circuit and apparatus
US2123241A (en) * 1937-08-05 1938-07-12 Bell Telephone Labor Inc Electric wave amplifier
US2300133A (en) * 1940-09-20 1942-10-27 Bell Telephone Labor Inc Broad band amplifier

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2745907A (en) * 1951-05-03 1956-05-15 Gunter K Guttwein Tone control circuit
US2806208A (en) * 1951-09-29 1957-09-10 Columbia Broadcasting Syst Inc Vacuum tube voltmeter
US2751444A (en) * 1952-05-21 1956-06-19 Ind Dev Engineering Associates Stabilizer for radio frequency amplifier
US2854530A (en) * 1953-02-23 1958-09-30 Philips Corp A. c.-biased amplifier circuit arrangement
US2782266A (en) * 1954-08-30 1957-02-19 Rca Corp Volume control
US2901561A (en) * 1956-01-23 1959-08-25 Bendix Aviat Corp High frequency amplifier circuit

Also Published As

Publication number Publication date
FR944141A (fr) 1949-03-28
GB641948A (en) 1950-08-23
DE806558C (de) 1951-06-14

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