GB562392A - Improvements in or relating to negative feedback amplifiers - Google Patents

Improvements in or relating to negative feedback amplifiers

Info

Publication number
GB562392A
GB562392A GB18319/42A GB1831942A GB562392A GB 562392 A GB562392 A GB 562392A GB 18319/42 A GB18319/42 A GB 18319/42A GB 1831942 A GB1831942 A GB 1831942A GB 562392 A GB562392 A GB 562392A
Authority
GB
United Kingdom
Prior art keywords
amplifier
transformer
networks
inductance
coaxial cable
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
GB18319/42A
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 GB562392A publication Critical patent/GB562392A/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04J—MULTIPLEX COMMUNICATION
    • H04J1/00—Frequency-division multiplex systems
    • H04J1/02—Details
    • H04J1/16—Monitoring arrangements
    • 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
    • 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
    • H03F1/542—Replacing by standby devices
    • 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
    • H04B1/74—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 for increasing reliability, e.g. using redundant or spare channels or apparatus

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Amplifiers (AREA)
  • Cable Transmission Systems, Equalization Of Radio And Reduction Of Echo (AREA)

Abstract

562,392. Valve amplifying circuits. STANDARD TELEPHONES & CABLES, Ltd., ROCHE, A. H., and ELLIOTT, T. W. Dec. 24, 1942, No. 18319. [Class 40 (v)] Instability during switching operations, as when a reserve negative feed-back amplifier is connected in parallel at a relay point' in a coaxial cable multi-channel carrier current signalling system, is avoided by the provision of means to ensure that the frequency of series resonance of the input and/or output transformer of one amplifier differs from that of the other amplifier. This may be achieved by connecting the second amplifier A2 through impedance networks N1, N2 so as to modify the impedance presented to the transformer of the amplifier A1. The networks will generally comprise reactive impedances and in a balanced system may be constituted by a series inductance in the conductor corresponding to the central conductor of the coaxial cable. In this way the effective leakage inductance of the corresponding transformer is increased. The networks may operate at frequencies outside the signal range and only a single network comprising only a single inductance may be used. The Specification gives an analysis of the effect of a parallel transformer and curves of the gain andphase-shift with frequency obtained.
GB18319/42A 1942-12-24 1942-12-24 Improvements in or relating to negative feedback amplifiers Expired GB562392A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB268701X 1942-12-24

Publications (1)

Publication Number Publication Date
GB562392A true GB562392A (en) 1944-06-29

Family

ID=10250498

Family Applications (1)

Application Number Title Priority Date Filing Date
GB18319/42A Expired GB562392A (en) 1942-12-24 1942-12-24 Improvements in or relating to negative feedback amplifiers

Country Status (6)

Country Link
US (1) US2364389A (en)
BE (1) BE467630A (en)
CH (1) CH268701A (en)
FR (1) FR939157A (en)
GB (1) GB562392A (en)
NL (1) NL74579C (en)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2429613A (en) * 1943-10-19 1947-10-28 Standard Telephones Cables Ltd Pulse multiplex communication system
US2429775A (en) * 1944-06-22 1947-10-28 Rca Corp Amplifier system

Also Published As

Publication number Publication date
US2364389A (en) 1944-12-05
FR939157A (en) 1948-11-05
BE467630A (en)
CH268701A (en) 1950-05-31
NL74579C (en)

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