GB566844A - Distortion reduction on modulated amplifiers - Google Patents

Distortion reduction on modulated amplifiers

Info

Publication number
GB566844A
GB566844A GB14867/43A GB1486743A GB566844A GB 566844 A GB566844 A GB 566844A GB 14867/43 A GB14867/43 A GB 14867/43A GB 1486743 A GB1486743 A GB 1486743A GB 566844 A GB566844 A GB 566844A
Authority
GB
United Kingdom
Prior art keywords
stage
amplifier
impedance
carrier
distortion
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
Application number
GB14867/43A
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.)
STC PLC
Original Assignee
Standard Telephone and Cables PLC
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 Standard Telephone and Cables PLC filed Critical Standard Telephone and Cables PLC
Publication of GB566844A publication Critical patent/GB566844A/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03C—MODULATION
    • H03C1/00—Amplitude modulation
    • H03C1/16—Amplitude modulation by means of discharge device having at least three electrodes
    • H03C1/18—Amplitude modulation by means of discharge device having at least three electrodes carrier applied to control grid
    • H03C1/22—Amplitude modulation by means of discharge device having at least three electrodes carrier applied to control grid modulating signal applied to same grid
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03C—MODULATION
    • H03C1/00—Amplitude modulation
    • H03C1/16—Amplitude modulation by means of discharge device having at least three electrodes
    • H03C1/18—Amplitude modulation by means of discharge device having at least three electrodes carrier applied to control grid
    • H03C1/20—Amplitude modulation by means of discharge device having at least three electrodes carrier applied to control grid modulating signal applied to anode
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03C—MODULATION
    • H03C7/00—Modulating electromagnetic waves
    • H03C7/02—Modulating electromagnetic waves in transmission lines, waveguides, cavity resonators or radiation fields of antennas
    • 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
    • H03F1/02—Modifications of amplifiers to raise the efficiency, e.g. gliding Class A stages, use of an auxiliary oscillation
    • H03F1/04—Modifications of amplifiers to raise the efficiency, e.g. gliding Class A stages, use of an auxiliary oscillation in discharge-tube amplifiers
    • H03F1/06—Modifications of amplifiers to raise the efficiency, e.g. gliding Class A stages, use of an auxiliary oscillation in discharge-tube amplifiers to raise the efficiency of amplifying modulated radio frequency waves; to raise the efficiency of amplifiers acting also as modulators
    • 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
    • H03H—IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS
    • H03H7/00—Multiple-port networks comprising only passive electrical elements as network components
    • H03H7/38—Impedance-matching networks
    • H03H7/383—Impedance-matching networks comprising distributed impedance elements together with lumped impedance elements

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Amplifiers (AREA)
  • Cable Transmission Systems, Equalization Of Radio And Reduction Of Echo (AREA)

Abstract

566,844. Valve modulating circuits. STANDARD TELEPHONES & CABLES, Ltd. Sept. 10, 1943, No. 14867. Convention date, Nov. 16, 1942. [Class 40 (v)] In order to avoid distortion in an anodemodulated carrier amplifier, an impedanceinverting line or network is interposed between the carrier source and the input of the amplifier. As shown, the carrier is fed to a push-pull preamplifier D, which feeds the modulated amplifier A through a quarter-wave line N. The tuned output circuit 11 of stage D and the tuned input circuit 15 of stage D are arranged to match the impedance of the respective valves with that of the line N. The anode supply circuit of the stage A includes a transformer secondary coil 29, the primary of which is in the output circuit of a signal amplifier B. The modulating stage A operates as a Class C amplifier, and the maximum signal voltage in coil 29 is made equal to the H.T. supply voltage. As the anode voltage of stage A varies, the input impedance of this stage also varies and this normally gives rise to distortion. A rise of input impedance of stage A is, however, owing to the action of the impedance inverter N, accompanied by an increased carrier output from the stage D, and distortion is thus corrected or reduced. The quarter-wave line may be replaced by an equivalent network, and the impedance-matching networks 11, 15 may be replaced by transformers, Figs. 2 and 3 (not shown).
GB14867/43A 1942-11-16 1943-09-10 Distortion reduction on modulated amplifiers Expired GB566844A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US465712A US2393709A (en) 1942-11-16 1942-11-16 Distortion reduction on modulated amplifiers

Publications (1)

Publication Number Publication Date
GB566844A true GB566844A (en) 1945-01-16

Family

ID=23848869

Family Applications (1)

Application Number Title Priority Date Filing Date
GB14867/43A Expired GB566844A (en) 1942-11-16 1943-09-10 Distortion reduction on modulated amplifiers

Country Status (4)

Country Link
US (1) US2393709A (en)
BE (1) BE470453A (en)
CH (1) CH270144A (en)
GB (1) GB566844A (en)

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NL72257C (en) * 1943-03-27
US2571045A (en) * 1945-08-08 1951-10-09 Alan B Macnee Amplifier coupling circuit
FR959970A (en) * 1946-10-18 1950-04-07
US2743356A (en) * 1949-06-25 1956-04-24 Rca Corp Tunable frequency systems of constant band width
BE506890A (en) * 1950-11-06
NL237518A (en) * 1958-04-08
US3290653A (en) * 1963-01-10 1966-12-06 Control Data Corp Single ended to double ended to single ended communication system

Also Published As

Publication number Publication date
CH270144A (en) 1950-08-15
BE470453A (en)
US2393709A (en) 1946-01-29

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