GB1242497A - Improvements in or relating to active filter networks - Google Patents

Improvements in or relating to active filter networks

Info

Publication number
GB1242497A
GB1242497A GB5087869A GB5087869A GB1242497A GB 1242497 A GB1242497 A GB 1242497A GB 5087869 A GB5087869 A GB 5087869A GB 5087869 A GB5087869 A GB 5087869A GB 1242497 A GB1242497 A GB 1242497A
Authority
GB
United Kingdom
Prior art keywords
active
active filter
circuit
relating
oct
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
GB5087869A
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.)
Siemens AG
Original Assignee
Siemens AG
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 Siemens AG filed Critical Siemens AG
Publication of GB1242497A publication Critical patent/GB1242497A/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B3/00—Line transmission systems
    • H04B3/02—Details
    • H04B3/04—Control of transmission; Equalising
    • H04B3/06—Control of transmission; Equalising by the transmitted signal
    • H04B3/08—Control of transmission; Equalising by the transmitted signal in negative-feedback path of line amplifier
    • 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
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03H—IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS
    • H03H11/00—Networks using active elements
    • H03H11/02—Multiple-port networks
    • H03H11/04—Frequency selective two-port networks
    • H03H11/12—Frequency selective two-port networks using amplifiers with feedback
    • H03H11/126—Frequency selective two-port networks using amplifiers with feedback using a single operational amplifier

Landscapes

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

Abstract

1,242,497. Active filters; amplifiers. SIEMENS A.G. 16 Oct., 1969 [17 Oct., 1968]., No. 50878/69. Headings H3U and H3W. An active filter having a variable bandpass or bandstop characteristic comprises an amplifier V1 having a negative feedback path which includes an active resonant circuit and a resistor. As shown in Fig. 6, the resonant circuit comprises an amplifier V2, resistors R3, R4, R5, R6, R7, R8 and capacitors C1, C2 and the resistor is either R1 or R2 depending on the setting of switch S1. The circuit is adjustable in frequency, band width, amplitude of the frequency peak, and mean gain by adjusting C2; C1, R3; R7; and R1, R2 respectively and either bandpass or bandstop characteristics may be selected by switch S1. Other forms of active resonant circuits may be employed, Figs. 2a, 3, 5a@, 7a, 8a, 9a, 10a (not shown). The feedback network may include an impedance bridge circuit.
GB5087869A 1968-10-17 1969-10-16 Improvements in or relating to active filter networks Expired GB1242497A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE19681803654 DE1803654B2 (en) 1968-10-17 1968-10-17 CIRCUIT ARRANGEMENT OF AN ADJUSTABLE EQUALIZER, PREFERABLY FOR CARRIER FREQUENCY SYSTEMS WITH SMALL CHANNELS

Publications (1)

Publication Number Publication Date
GB1242497A true GB1242497A (en) 1971-08-11

Family

ID=5710784

Family Applications (1)

Application Number Title Priority Date Filing Date
GB5087869A Expired GB1242497A (en) 1968-10-17 1969-10-16 Improvements in or relating to active filter networks

Country Status (5)

Country Link
JP (1) JPS4812643B1 (en)
DE (1) DE1803654B2 (en)
GB (1) GB1242497A (en)
NL (1) NL152726B (en)
SE (1) SE351343B (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2511098C2 (en) * 1975-03-13 1983-01-05 Siemens AG, 1000 Berlin und 8000 München Circuit arrangement for decoding a frequency-modulated stereo broadcast signal

Also Published As

Publication number Publication date
JPS4812643B1 (en) 1973-04-21
NL6915098A (en) 1970-04-21
SE351343B (en) 1972-11-20
DE1803654A1 (en) 1970-06-11
NL152726B (en) 1977-03-15
DE1803654B2 (en) 1972-04-13

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