GB395111A - Improvements in or relating to electric filters - Google Patents

Improvements in or relating to electric filters

Info

Publication number
GB395111A
GB395111A GB10246/32A GB1024632A GB395111A GB 395111 A GB395111 A GB 395111A GB 10246/32 A GB10246/32 A GB 10246/32A GB 1024632 A GB1024632 A GB 1024632A GB 395111 A GB395111 A GB 395111A
Authority
GB
United Kingdom
Prior art keywords
filter
coupling
valve
frequency
april
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
GB10246/32A
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.)
Koninklijke Philips NV
Original Assignee
Philips Gloeilampenfabrieken NV
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 Philips Gloeilampenfabrieken NV filed Critical Philips Gloeilampenfabrieken NV
Publication of GB395111A publication Critical patent/GB395111A/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
    • H03H7/0115—Frequency selective two-port networks comprising only inductors and capacitors
    • 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
    • H03H7/175—Series LC in series 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
    • H03H7/1775—Parallel LC in shunt or branch path

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Amplifiers (AREA)
  • Networks Using Active Elements (AREA)
  • Electrophonic Musical Instruments (AREA)

Abstract

395,111. Valve circuits. NAAMLOOZE VENNOOTSCHAP PHILIPS' GLOEILAMPENFABRIEKEN, 13D, Emmasingel, Eindhoven, Holland. April 9, 1932, No. 10246. Convention date, April 25, 1931. [Classes 40 (iii) and 40 (v).] A filter having a characteristic 1 in the absence of dissipation or 2 when the impedance elements have appreciable resistance is flattened to forms 3, 4, by different degrees of backcoupling to the input valve. Preferably the coupling impedance is constituted by part of the resistance R2, the remainder of which provides coupling to a second valve through an output transformer T. The invention utilizes the fact that the phase-lag introduced by the filter varies with frequency: the voltage fed back at the peak frequency C is in opposite phase to the input voltage at that frequency. In the example shown the amplification at frequencies A, C, E is reduced by the back-coupling and at frequencies B, D; it is increased. The terminal impedances are matched to the filter.
GB10246/32A 1931-10-01 1932-04-09 Improvements in or relating to electric filters Expired GB395111A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US566223A US1968237A (en) 1931-10-01 1931-10-01 Band pass circuit

Publications (1)

Publication Number Publication Date
GB395111A true GB395111A (en) 1933-07-13

Family

ID=46465642

Family Applications (1)

Application Number Title Priority Date Filing Date
GB10246/32A Expired GB395111A (en) 1931-10-01 1932-04-09 Improvements in or relating to electric filters

Country Status (3)

Country Link
US (1) US1968237A (en)
DE (1) DE584644C (en)
GB (1) GB395111A (en)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
BE471221A (en) * 1945-01-01
NL278982A (en) * 1961-10-06
DE1281060B (en) * 1962-05-24 1968-10-24 Siemens Ag Bandstop filter for electrical oscillations with improved blocking damping
US3659280A (en) * 1967-11-20 1972-04-25 Dantronics Inc Communication system using the electrical power distribution network of a building
JP2005033604A (en) * 2003-07-08 2005-02-03 Taiyo Yuden Co Ltd Phase shifter

Also Published As

Publication number Publication date
US1968237A (en) 1934-07-31
DE584644C (en) 1933-09-22

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