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GB490819A - Improvements in or relating to electrical filter arrangements - Google Patents

Improvements in or relating to electrical filter arrangements

Info

Publication number
GB490819A
GB490819A GB5153/37A GB515337A GB490819A GB 490819 A GB490819 A GB 490819A GB 5153/37 A GB5153/37 A GB 5153/37A GB 515337 A GB515337 A GB 515337A GB 490819 A GB490819 A GB 490819A
Authority
GB
United Kingdom
Prior art keywords
valve
feedback
produced
circuits
negative feedback
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
GB5153/37A
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.)
Marconis Wireless Telegraph Co Ltd
BAE Systems Electronics Ltd
Original Assignee
Marconis Wireless Telegraph Co Ltd
Marconi Co Ltd
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 Marconis Wireless Telegraph Co Ltd, Marconi Co Ltd filed Critical Marconis Wireless Telegraph Co Ltd
Priority to GB5153/37A priority Critical patent/GB490819A/en
Priority to US191426A priority patent/US2210384A/en
Publication of GB490819A publication Critical patent/GB490819A/en
Expired legal-status Critical Current

Links

Classifications

    • 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
    • H03H7/0153—Electrical filters; Controlling thereof
    • H03H7/0161—Bandpass filters
    • 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
    • H03H7/17—Structural details of sub-circuits of frequency selective networks
    • H03H7/1741—Comprising typical LC combinations, irrespective of presence and location of additional resistors
    • H03H7/1775—Parallel LC in shunt or branch path
    • 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
    • H03H7/17—Structural details of sub-circuits of frequency selective networks
    • H03H7/1741—Comprising typical LC combinations, irrespective of presence and location of additional resistors
    • H03H7/1791—Combined LC in shunt or branch path

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Amplifiers (AREA)
  • Transmitters (AREA)
  • Networks Using Active Elements (AREA)

Abstract

490,819. Valve circuits for wireless reception. MARCONI'S WIRELESS TELEGRAPH CO., Ltd., RUST, N. M., and BRAILSFORD, J. D. Feb. 20, 1937, No. 5153. [Class 40 (v)] In a wireless receiver a band-pass filter is provided and a valve having frequency selective negative feedback such that the feedback at the middle of the pass range is small and near the ends of the pass range large to give a characteristic having a flat top and a sharp cut off. The Figure shows an arrangement in which the valve 2 precedes an adjustable band filter 10, 11 and negative feedback is produced by circuits 7, 8 tuned to the limits of the pass range. In modifications the feedback is produced by an acceptor circuit in shunt to a rejector circuit Fig. 2 (not shown) or in shunt to a choke Fig. 7 (not shown) or the feedback may be produced by various arrangements of circuits coupled to the cathode circuit of the valve, Figs. 3-6 (not shown). The mutual conductance of the valve with the negative feedback may be controlled automatically in accordance with signal strength. Specification 479,599 is referred to.
GB5153/37A 1937-02-20 1937-02-20 Improvements in or relating to electrical filter arrangements Expired GB490819A (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
GB5153/37A GB490819A (en) 1937-02-20 1937-02-20 Improvements in or relating to electrical filter arrangements
US191426A US2210384A (en) 1937-02-20 1938-02-19 Electrical filter arrangement

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB5153/37A GB490819A (en) 1937-02-20 1937-02-20 Improvements in or relating to electrical filter arrangements

Publications (1)

Publication Number Publication Date
GB490819A true GB490819A (en) 1938-08-22

Family

ID=9790681

Family Applications (1)

Application Number Title Priority Date Filing Date
GB5153/37A Expired GB490819A (en) 1937-02-20 1937-02-20 Improvements in or relating to electrical filter arrangements

Country Status (2)

Country Link
US (1) US2210384A (en)
GB (1) GB490819A (en)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2431103A (en) * 1944-06-17 1947-11-18 Philco Corp Tuning device
US2652450A (en) * 1948-05-29 1953-09-15 Rca Corp Sync separation and automatic gain control
US2658958A (en) * 1949-07-16 1953-11-10 Wilcox Gay Corp Negative feedback frequency response compensation amplifier system
US2848611A (en) * 1953-07-23 1958-08-19 Collins Radio Co Phase stabilization of r. f. amplifiers and oscillator circuits
US3295045A (en) * 1963-06-21 1966-12-27 Ohio Crankshaft Co Phase and frequency conversion system

Also Published As

Publication number Publication date
US2210384A (en) 1940-08-06

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