GB1230496A - - Google Patents

Info

Publication number
GB1230496A
GB1230496A GB1230496DA GB1230496A GB 1230496 A GB1230496 A GB 1230496A GB 1230496D A GB1230496D A GB 1230496DA GB 1230496 A GB1230496 A GB 1230496A
Authority
GB
United Kingdom
Prior art keywords
network
amplifier
star
capacitors
inverting
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
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 filed Critical
Publication of GB1230496A publication Critical patent/GB1230496A/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03H—IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS
    • H03H11/00—Networks using active elements
    • H03H11/02—Multiple-port networks
    • H03H11/16—Networks for phase shifting
    • H03H11/18—Two-port phase shifters providing a predetermined phase shift, e.g. "all-pass" filters
    • 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
    • H03H11/1217—Frequency selective two-port networks using amplifiers with feedback using a plurality of operational amplifiers
    • 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
    • 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
    • H03H11/1295—Parallel-T filters
    • 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

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Networks Using Active Elements (AREA)
  • Amplifiers (AREA)

Abstract

1,230,496. Active filters. RFT MESSELEKTRONIK DRESDEN VEB. 29 April, 1969, No. 21744/69. Heading H3W. An active filter comprising an amplifier V with a negative feedback path including a bridged T network is characterized in that a star network Z x , Z y , Z z is provided with its outer terminals connected to the star point of the T network c, and inverting and non inverting inputs of the amplifier a, b and the filter input is connected to the star point of this network c. The impedances in the star and bridged-T networks are capacitors and resistor which may be arranged as shown in Fig. 1, alternatively the resistors and capacitors may be interchanged Fig. 2 (not shown). The inverting and non inverting inputs to the amplifier may be provided by employing a two stage amplifier and connecting the impedances Z y , Z z to different stages Figs. 3a, 3b (not shown). In a further modification Fig. 5 (not shown) the bridging impedance of the T network in the feedback path is constituted by a further CR T network, the impedance Z x being connected to the star point of this further network. Any arrangement of capacitors and resistors may be used in this further T network Fig. 4 (not shown).
GB1230496D 1968-12-13 1969-04-29 Expired GB1230496A (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DD13666268 1968-12-13
FR6901087A FR2029266A5 (en) 1968-12-13 1969-01-22
GB2174469 1969-04-29

Publications (1)

Publication Number Publication Date
GB1230496A true GB1230496A (en) 1971-05-05

Family

ID=27179733

Family Applications (1)

Application Number Title Priority Date Filing Date
GB1230496D Expired GB1230496A (en) 1968-12-13 1969-04-29

Country Status (4)

Country Link
AT (1) AT292785B (en)
DE (1) DE1954543A1 (en)
FR (1) FR2029266A5 (en)
GB (1) GB1230496A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0100597A1 (en) * 1982-06-29 1984-02-15 British Telecommunications RC-active filters

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0100597A1 (en) * 1982-06-29 1984-02-15 British Telecommunications RC-active filters
US4553103A (en) * 1982-06-29 1985-11-12 British Telecommunications RC-Active filters

Also Published As

Publication number Publication date
DE1954543A1 (en) 1970-07-09
FR2029266A5 (en) 1970-10-16
AT292785B (en) 1971-08-15

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Legal Events

Date Code Title Description
PS Patent sealed
PLNP Patent lapsed through nonpayment of renewal fees