US2761021A - Multiple way inverse feed-back connection - Google Patents

Multiple way inverse feed-back connection Download PDF

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Publication number
US2761021A
US2761021A US239714A US23971451A US2761021A US 2761021 A US2761021 A US 2761021A US 239714 A US239714 A US 239714A US 23971451 A US23971451 A US 23971451A US 2761021 A US2761021 A US 2761021A
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United States
Prior art keywords
circuit
tuned
feed
path
phase
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Expired - Lifetime
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US239714A
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English (en)
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Leuthold Eugen
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Individual
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Individual
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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
    • H03H—IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS
    • H03H7/00—Multiple-port networks comprising only passive electrical elements as network components
    • H03H7/01—Frequency selective two-port networks
    • H03H7/0138—Electrical filters or coupling circuits

Definitions

  • This invention relates to a multiple path inverse feedback connection and is especially applicable to high frequency resonant circuits as they are used in radio receivers for example.
  • the invention mainly consists in the compensation of certain phase displacements which, when present, adversely affect the resonance curve of the resonant circuits. It is, therefore, the main object of the invention to improve the shape of the resonance curve by eliminating such phase displacements and, incidentally, to thereby improve the sound transmitting properties of the radio receiver.
  • the invention mainly consists of the compensation of adverse phase displacements or shifts of the current in relation to the generating inverse feed-back voltage by the employment of impedance elements which are connected to produce phase coincidence.
  • the invention thus provides the necessary phase coincidence by compensating for the adverse phase displacements or shifts of the current in relation to the inverse feed-back voltage, which are introduced by the interaction of the capacitative and/or inductive impedances as well as the resistive impedances in the amplifier circuit.
  • This phase coincidence and correction is produced by the employment of impedances such as are capable of achieving this result.
  • phase-reversing circuit which is connected in parallel and/ or in series with capacitative and/or inductive impedances.
  • a further feature of the invention resides in obtaining the required phase coincidence by an additional path of inverse feed-back consisting of a phase-reversing circuit applied to a point of inverse feed-back voltage of more than 90 displacement.
  • a phase displacement of 180 will be imparted to the inverse feed-back voltage.
  • a further modification of the present invention consists in procuring the symmetry of the inverse feed-back resistance R2.
  • FIG. 2 shows a circuit in accordance with the invention with an additional inverse feed-back
  • Fig. 3 shows a modified embodiment of the invention in which purelyresistive impedances and a phase bridge for the additional inverse feed-back are used;
  • Fig. 4 is a vector diagram forexplaining the phase relationships of the voltages and currents in the feedback circuits of the present invention.
  • Fig. 1 a known form of the multiple inverse feedback circuit is shown, in which an inverse feed-back is produced in the two circuits 1 and 2 by the resonant circuit 3, whereby all circuits are controlled with a single tube 4.
  • One inverse feedaback path leads from the resonant circuit 3 through the resistance R2 to the resonant circuit 2, and another inversefeed-back path through the condenser C1 'to the resonant circuit 1.
  • Fig. 2 illustrates a multiple path inverse feed-back coni nection in accordance with the present invention in which an additional inverse feed-back path is introduced in the resonant circuit 1, which leads to this circuit through an inductor Li thereby causing a voltage which is in opposite phase to the feed-back voltage-caused by capacitor
  • a further embodiment of the invention is shown in Fig. 3.
  • a first inverse feed-back path leads in' known manner to the resonant circuit 2 through the
  • a second inverse feed-back path leads to the resonant circuit 1 by means of a phase bridge CY-R C R, consisting ofcapacitors C and resistoi's R, and by means of resistor R1.
  • CY-R C R consisting ofcapacitors C and resistoi's R
  • the feed-back voltage across resistor R2 in the feedback branch leading to tuned input circuit 2 is represented by vector E.
  • E the feed-back voltage across resistor R2 in the feedback branch leading to tuned input circuit 2
  • the feed-back of energy to the tuned output circuit 1 of the immediately preceding stage be precisely out of phase with the energy fed back to the tuned input circuit 2. It might appear that this could be accomplished merely by using a capacitive feed-back path.
  • the voltage across capacitance C1 has a phase relationship relative to E as illustrated by the vector E0, and the voltage across resistor R1 is B3,.
  • the I current through capacitance C1 leads the voltage thereacross by 90 as indicated by the dashed line vector 10,.
  • the voltage E across the inductive branch of the feedback path is also broken up into two components, EL1 across coupling coil L1 and ER, across the resistor R1. These vectors are indicated in Fig. 4.
  • the current through coupling coil L1 lags the voltage thereacross by 90 and is indicated on the vector diagram by the dashed line 1L1.
  • current vector Ir. may be indicated by a second vector IL, which is out of phase with 11.
  • a circuit arrangement comprising-11incombination,-
  • tuned input circuit for: feeding energy thereto;
  • vcapacitive means defining one path-:lportion between-said .coue:
  • a circuit arrangement comprising, :in' combination,
  • an additional:tuned circuit coupledw tosaid tuned input circuit for feeding energy theretoyaw resistive first feed-back path from said tuned output Cit cuit to' said tuned input circuition-supplying negative feed-back energy to said tuned input circuit, comprising a coil coupled to said input circuit and a resistor coupled between said output tunedcircuit andrsaid coil;' and means,
  • a circuit arrangement comprising, in combination, an amplifierstagehaving a tuned input circuit and a tuned output circuit; an additional tuned circuit-coupled to said; tuned :input, circuit.

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Amplifiers (AREA)
US239714A 1950-08-10 1951-08-01 Multiple way inverse feed-back connection Expired - Lifetime US2761021A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE319081X 1950-08-10

Publications (1)

Publication Number Publication Date
US2761021A true US2761021A (en) 1956-08-28

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Family Applications (1)

Application Number Title Priority Date Filing Date
US239714A Expired - Lifetime US2761021A (en) 1950-08-10 1951-08-01 Multiple way inverse feed-back connection

Country Status (4)

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US (1) US2761021A (xx)
CH (1) CH319081A (xx)
GB (1) GB696928A (xx)
NL (2) NL163018B (xx)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2886655A (en) * 1955-06-30 1959-05-12 Mcintosh Lab Inc Amplifier
US3569851A (en) * 1967-04-20 1971-03-09 Siemens Ag Electrical filter circuit

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2156137A (en) * 1937-10-16 1939-04-25 Hazeltine Corp Band-pass selector
US2205075A (en) * 1936-07-10 1940-06-18 Telefunken Gmbh Variable width band-pass filter
US2268672A (en) * 1938-05-24 1942-01-06 Radio Patents Corp Selective amplifier
US2383867A (en) * 1943-01-13 1945-08-28 Rca Corp Power output amplifier circuit
US2404809A (en) * 1941-08-05 1946-07-30 Decca Record Co Ltd Compensating circuit
US2455471A (en) * 1946-03-28 1948-12-07 Operadio Mfg Co Electrical apparatus for loudspeaker systems

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2205075A (en) * 1936-07-10 1940-06-18 Telefunken Gmbh Variable width band-pass filter
US2156137A (en) * 1937-10-16 1939-04-25 Hazeltine Corp Band-pass selector
US2268672A (en) * 1938-05-24 1942-01-06 Radio Patents Corp Selective amplifier
US2404809A (en) * 1941-08-05 1946-07-30 Decca Record Co Ltd Compensating circuit
US2383867A (en) * 1943-01-13 1945-08-28 Rca Corp Power output amplifier circuit
US2455471A (en) * 1946-03-28 1948-12-07 Operadio Mfg Co Electrical apparatus for loudspeaker systems

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2886655A (en) * 1955-06-30 1959-05-12 Mcintosh Lab Inc Amplifier
US3569851A (en) * 1967-04-20 1971-03-09 Siemens Ag Electrical filter circuit

Also Published As

Publication number Publication date
GB696928A (en) 1953-09-09
NL83763C (xx)
NL163018B (nl)
CH319081A (de) 1957-01-31

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