US2662128A - Circuit-arrangement for amplifying and separating signals of different frequencies - Google Patents

Circuit-arrangement for amplifying and separating signals of different frequencies Download PDF

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Publication number
US2662128A
US2662128A US240662A US24066251A US2662128A US 2662128 A US2662128 A US 2662128A US 240662 A US240662 A US 240662A US 24066251 A US24066251 A US 24066251A US 2662128 A US2662128 A US 2662128A
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US
United States
Prior art keywords
circuit
arrangement
amplifying
anode
tube
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
Application number
US240662A
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English (en)
Inventor
Adrianus Johannes Wilhel Marie
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 US2662128A publication Critical patent/US2662128A/en
Anticipated expiration legal-status Critical
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N5/00—Details of television systems
    • H04N5/44—Receiver circuitry for the reception of television signals according to analogue transmission standards
    • H04N5/4446—IF amplifier circuits specially adapted for B&W TV
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
    • H04B1/06—Receivers
    • H04B1/10—Means associated with receiver for limiting or suppressing noise or interference
    • H04B1/12—Neutralising, balancing, or compensation arrangements
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
    • H04B1/06—Receivers
    • H04B1/16—Circuits
    • H04B1/1638—Special circuits to enhance selectivity of receivers not otherwise provided for
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N5/00—Details of television systems
    • H04N5/04—Synchronising
    • H04N5/08—Separation of synchronising signals from picture signals
    • H04N5/10—Separation of line synchronising signal from frame synchronising signal or vice versa
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N5/00—Details of television systems
    • H04N5/44—Receiver circuitry for the reception of television signals according to analogue transmission standards
    • H04N5/60—Receiver circuitry for the reception of television signals according to analogue transmission standards for the sound signals

Definitions

  • This invention relates to circuit-arrangements for amplifying and separating signals of different frequencies by means of a tube having at least a cathode, a control grid, a secondaryemission electrode and an anode, wherein the signal oscillations to be separated are supplied to the control grid circuit.
  • This circuit-arrangement may be used both for separating picture signals and sound signals and line and frame synchronizing action pulses, for removing interference signals in low-frequency amplifiers, for separating quency oscillations in reflex receivers, and for similar purposes.
  • a tube of the type described in the preamble is used.
  • a series-connection of two impedances is connected between the anode of the tube and a point of constant potential; the common point of these impedances is connected to the secondary-emission electrode of the tube.
  • a circuit tuned to one of the oscillation frequencies is connected between the junction 7 point of one impedance and the anode and a point of constant potential.
  • the two impedances have such values with respect to the resonance impedance of the tuned circuit that no voltage of this resonant frequency is set up between the secondary-emission electrode and the point of constant potential.
  • the circuit is comparable to a bridge-circuit which is in equilibrium for one of the frequencies to be separated.
  • Fig. 1 shows circuit-arrangement according to the invention, for example, for amplifying intermediatedrequency and audio-fre- 4 Claims.
  • I M audio-frequency oscillations in which an interfering signal of a frequency exceeding the range of frequencies to be amplified is required to be eliminated.
  • the signal to be amplified is sup-- plied between terminals I to control grid 3 and cathode 5 of an amplifying tube 4.
  • This tube furthermore, comprises a screen grid 6' having a positive potential, a secondary-emission electrode 1 and an anode 8.
  • a circuit 9 tuned to the interfering signal is connected in the lead between the anode 8 and the positive terminal I 3 of the supply.
  • the described circuit-arrangement operates as follows:
  • the impedance of circuit 9 is very high for the interfering signal which may, for example, have a frequency of 9000 c./s., with the result that the major part of the anode alternating current for this frequency passes through the impedance H).
  • the current passing through the impedance I! may be used to balance the alternating current of the secondary-emission electrode passing in the opposite direction, so that no interfering voltage will be produced at terminal M.
  • a circuit-arrangement, wherein the impedances are constituted by resistors I6, I! is shown in Fig. 2, these resistors serving at the same time to feed supply voltage to the secondary-emission electrode.
  • the resistor I6 is adjustable by means of sliding contact I8, so that the resistance value may be conveniently chosen.
  • this circuit may be coupled to an inductor 20, the signals of the second channel being taken from the terminals 2.
  • Apparatus responsive to an incoming signal having first and second signal components of different frequency for amplifying and separating said signal components therefrom comprising an electron discharge tube having a cathode, a control grid, an anode and a secondary emission electrode, a resonant circuit tuned to the frequency of said first signal component and coupled between the anode of said tube and a point of high constant potential relative to the cathode of said tube, means to supply said incoming signal to the control grid of said tube whereby both signal components appear in amplified form at both the anode a d the secondary emission electrode of said tube, first and second impedances serially connected together between the anode and cathode of the tube, the junction of said impedances being connected to said secondary emission electrode, said impedances having impedance values measured at the frequency of said first signal component at which relative to the corresponding impedance value of said resonant circuit substantially all of said first signal component appears across said resonant circuit and substantially all of said second signal component appears
  • Apparatus responsive to an incoming signal having first and second components of different frequency and adapted both to amplify and separate said components said apparatus comprising an electron discharge tube having a cathode, a control grid, an anode and a secondary emission electrode, means to apply a bias to said cathode relative to ground, a resonant circuit'tuned to the frequency of said first signal component, means to apply a positive potential relative to ground to said anode through said resonant circuit, means to supply said incoming signal between said grid and ground, first and second impedances connected serially between said anode and ground, the junction point of said impedances being connected to said secondary emission electrode, said impedances having values with respect to the frequency of said first component at which relative to the impedance value of said resonant circuit at the same frequency substantially all of said first frequency component is developed across said resonant circuit while substantially all of said second signal component appears between said junction and ground, means to derive the amplified first signal component from said reson

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  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Multimedia (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Amplifiers (AREA)
US240662A 1950-08-25 1951-08-07 Circuit-arrangement for amplifying and separating signals of different frequencies Expired - Lifetime US2662128A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
NL293576X 1950-08-25

Publications (1)

Publication Number Publication Date
US2662128A true US2662128A (en) 1953-12-08

Family

ID=19782868

Family Applications (1)

Application Number Title Priority Date Filing Date
US240662A Expired - Lifetime US2662128A (en) 1950-08-25 1951-08-07 Circuit-arrangement for amplifying and separating signals of different frequencies

Country Status (7)

Country Link
US (1) US2662128A (zh)
BE (1) BE505422A (zh)
CH (1) CH293576A (zh)
DE (1) DE874151C (zh)
FR (1) FR1041286A (zh)
GB (1) GB682151A (zh)
NL (1) NL81595C (zh)

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB514762A (en) * 1938-06-03 1939-11-16 Ferranti Ltd Improvements in or relating to thermionic amplifiers
US2235190A (en) * 1937-03-10 1941-03-18 Rca Corp Electronic tube circuit
US2473754A (en) * 1941-07-19 1949-06-21 Hartford Nat Bank & Trust Co Amplifier circuits with double control

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2235190A (en) * 1937-03-10 1941-03-18 Rca Corp Electronic tube circuit
GB514762A (en) * 1938-06-03 1939-11-16 Ferranti Ltd Improvements in or relating to thermionic amplifiers
US2473754A (en) * 1941-07-19 1949-06-21 Hartford Nat Bank & Trust Co Amplifier circuits with double control

Also Published As

Publication number Publication date
FR1041286A (fr) 1953-10-22
NL81595C (zh)
DE874151C (de) 1953-04-20
CH293576A (de) 1953-09-30
BE505422A (zh)
GB682151A (en) 1952-11-05

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