US2510683A - Negative feedback amplifier circuit - Google Patents

Negative feedback amplifier circuit Download PDF

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Publication number
US2510683A
US2510683A US665393A US66539346A US2510683A US 2510683 A US2510683 A US 2510683A US 665393 A US665393 A US 665393A US 66539346 A US66539346 A US 66539346A US 2510683 A US2510683 A US 2510683A
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US
United States
Prior art keywords
tube
anode
cathode
circuit
voltage
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Expired - Lifetime
Application number
US665393A
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English (en)
Inventor
Carpentier Edmond Egbertus
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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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 US2510683A publication Critical patent/US2510683A/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
    • 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
    • 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

Definitions

  • the circuit arrangement shown in this figure comprises an amplifying tube I whose control grid has a voltage to be amplified, supplied to it via input terminals 2 and 3 and Whose anode circuit and cathode circuit include resistances 4 and 5 respectively of equal value.
  • the anode and the cathode of tube I are connected in the usual manner to the control grids of two push-pull connected amplifying tubes I5 and I1 respectively via coupling condensers I and 9 and leakage resistance II and I3 respectively, due to which on controlling tube I the voltages set up at the resistances 4 and 5 control the tubes I5 and I! in push-pull.
  • the anode circuits of these two tubes include the primary winding 2
  • Tube I is connected in accordance with the so-called cathodyne arrangement, with the aid of which an alternating voltage asymmetrical relatively to ground is converted into a symmetrical voltage.
  • a known property of this circuit consists in the whole voltage set up at the oathode resistance being supplied to the control grid of the amplifyin tube in anti-phase with the input voltage to be amplified, in other words tube I has negative feed-back, resulting in an appreciable decrease of the distortion which occurs in this tube.
  • Another consequence of the negative feed-back coupling is, however, that the voltage set up at the cathode resistance 5 can at most become equal to the input voltage, in other words an amplified voltage is not set up at this resistance.
  • object. ofthe invention. is to. provide.- improvement .of; the. circuitarrangementsto ,which the, invention has reference whereby negative feedback. is incorporated in the, circuit; under.
  • the invention consists. in. a; negative. feedbackv voltage: or. cur rent derived from.theoutputcircuit ofzthepush pull connected tubes bein supplied to the cathode circuit of the first-mentioned amplifying tube and the cathode impedance of this tube being given a lower value than the anode impedance.
  • tube I are in anti-phase with the input voltage of tube 1 the two first-mentioned voltages are consequently in phase and support each other, that is to say the anode current of tube I flowing through the resistance 5 is increased by the negative iced-back current flowing through the resistance 21. Consequently, the voltage drop at the resistance 5 required for the push-pull control of tube I1 is obtained at a lower value of this resistance than in the circuit shown in Fig. 1, that is to say that in the circuit according to the invention the cathode resistance 5 of tube I must be smaller than the anode resistance 4.
  • An amplifier circuit arrangement comprising a first electron discharge tube having a cathode, a grid and an anode, an anode impedance element coupled to said anode, a cathode impedance element having an impedance value smaller than that of said anode impedance element and being coupled to said cathode, means to apply signals to be amplified to the grid of said first tube to produce a first output voltage across said anode impedance element and a second output voltage across said cathode impedance element in anti-phase with respect to said first output voltage, a second and a third electron discharge tube each having a cathode, a grid and an anode and being connected in pushpull amplifying relationship, means to couple the grid of said second tube to the anode of said first tube to apply said first output voltage thereto, means to couple the grid of said third tube to the cathode of said first tube to apply said second voltage output thereto, and means to couple the anode of said second tube to the cathode
  • An amplifier circuit arrangement comprising a first electron discharge tube having a cathode, a grid and an :anode, an anode resistor coupled to said anode, a cathode resistor having a resistance value smaller than that of said anode resistor and being coupled to said cathode, means to apply signals to be amplified between the grid and cathode of said first tube to produce a first output voltage across said anode resistor and a second output voltage across said cathode resistor in anti-phase with respect to said first output voltage, a second and a third electron discharge tube each having a cathode, :a grid and an anode and being connected in pushpull amplifying relationship, means to couple the grid of said second tube to the anode of said first tube to apply said first output voltage thereto, means to couple the grid of said third tube to the cathode of said first tube to apply said second voltage output thereto, and means comprising a resistor coupling the anode of said second tube to the ca

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Amplifiers (AREA)
US665393A 1942-09-25 1946-04-27 Negative feedback amplifier circuit Expired - Lifetime US2510683A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
NL624006X 1942-09-25

Publications (1)

Publication Number Publication Date
US2510683A true US2510683A (en) 1950-06-06

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Family Applications (1)

Application Number Title Priority Date Filing Date
US665393A Expired - Lifetime US2510683A (en) 1942-09-25 1946-04-27 Negative feedback amplifier circuit

Country Status (5)

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US (1) US2510683A (enrdf_load_html_response)
DE (1) DE927698C (enrdf_load_html_response)
FR (1) FR898262A (enrdf_load_html_response)
GB (1) GB624006A (enrdf_load_html_response)
NL (1) NL61443C (enrdf_load_html_response)

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2594912A (en) * 1945-02-27 1952-04-29 Us Sec War Electrical driving circuit
US2613344A (en) * 1949-03-08 1952-10-07 Walter H Nelson High-voltage regulator
US2659775A (en) * 1949-03-21 1953-11-17 Wallace H Coulter Amplifier circuit having seriesconnected tubes
US2815407A (en) * 1956-10-04 1957-12-03 Hafler David Audio-amplifier
US2901560A (en) * 1954-09-14 1959-08-25 Philips Corp Amplifier for a wide frequency band more particularly video frequency amplifiers
US2921193A (en) * 1956-09-21 1960-01-12 Sperry Rand Corp Voltage regulators
US2934713A (en) * 1954-09-17 1960-04-26 Itt Anode-follower amplifier

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1052594B (de) * 1955-04-06 1959-03-12 Westinghouse Electric Corp Schaltungsanordnung zur Linearisierung von durch Kondensatorent- oder -aufladung erzeugten Saegezahnspannungen

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2103506A (en) * 1936-04-01 1937-12-28 Bell Telephone Labor Inc Wave translating system
US2215439A (en) * 1939-05-31 1940-09-17 Gen Electric Amplifier
US2361198A (en) * 1942-06-12 1944-10-24 Westinghouse Electric & Mfg Co Feedback amplifier

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
BE362743A (enrdf_load_html_response) * 1928-09-19
DE710970C (de) * 1938-03-24 1941-09-24 Telefunken Gmbh Schaltungsanordnung zur Beeinflussung des Frequenzganges von Verstaerkern

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2103506A (en) * 1936-04-01 1937-12-28 Bell Telephone Labor Inc Wave translating system
US2215439A (en) * 1939-05-31 1940-09-17 Gen Electric Amplifier
US2361198A (en) * 1942-06-12 1944-10-24 Westinghouse Electric & Mfg Co Feedback amplifier

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2594912A (en) * 1945-02-27 1952-04-29 Us Sec War Electrical driving circuit
US2613344A (en) * 1949-03-08 1952-10-07 Walter H Nelson High-voltage regulator
US2659775A (en) * 1949-03-21 1953-11-17 Wallace H Coulter Amplifier circuit having seriesconnected tubes
US2901560A (en) * 1954-09-14 1959-08-25 Philips Corp Amplifier for a wide frequency band more particularly video frequency amplifiers
US2934713A (en) * 1954-09-17 1960-04-26 Itt Anode-follower amplifier
US2921193A (en) * 1956-09-21 1960-01-12 Sperry Rand Corp Voltage regulators
US2815407A (en) * 1956-10-04 1957-12-03 Hafler David Audio-amplifier

Also Published As

Publication number Publication date
FR898262A (fr) 1945-04-18
DE927698C (de) 1955-05-16
GB624006A (en) 1949-05-26
NL61443C (enrdf_load_html_response)

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