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GB1212671A - Active filters with independent control of the pole and zero locations - Google Patents

Active filters with independent control of the pole and zero locations

Info

Publication number
GB1212671A
GB1212671A GB3523766A GB3523766A GB1212671A GB 1212671 A GB1212671 A GB 1212671A GB 3523766 A GB3523766 A GB 3523766A GB 3523766 A GB3523766 A GB 3523766A GB 1212671 A GB1212671 A GB 1212671A
Authority
GB
United Kingdom
Prior art keywords
pole
independent control
active filters
zero locations
twin
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
GB3523766A
Inventor
Walter Farrer
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.)
Individual
Original Assignee
Individual
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 Individual filed Critical Individual
Priority to GB3523766A priority Critical patent/GB1212671A/en
Publication of GB1212671A publication Critical patent/GB1212671A/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
    • H03H11/04—Frequency selective two-port networks
    • H03H11/12—Frequency selective two-port networks using amplifiers with feedback
    • H03H11/1295—Parallel-T filters

Landscapes

  • Networks Using Active Elements (AREA)

Abstract

1,212,671. Transistor amplifying circuits. W. FARRER. 5 Oct., 1967 [5 Aug., 1966], No. 35237/66. Heading H3T. A filter having independently adjustable poles and zeros comprises a twin-T resistance capacitance network R1, R2, Cl and C2, C3, R3 feeding a unity gain amplifier T1, T2 and feedback from the amplifier to the shunt arms of the twin-T. The poles and zeros are adjusted by means of potentiometers RV1, RV2. In an alternative arrangement, the connections of R1 and C2 to the potentiometer RV1 are interchanged. A number of basic units may be connected in parallel or series.
GB3523766A 1966-08-05 1966-08-05 Active filters with independent control of the pole and zero locations Expired GB1212671A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB3523766A GB1212671A (en) 1966-08-05 1966-08-05 Active filters with independent control of the pole and zero locations

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB3523766A GB1212671A (en) 1966-08-05 1966-08-05 Active filters with independent control of the pole and zero locations

Publications (1)

Publication Number Publication Date
GB1212671A true GB1212671A (en) 1970-11-18

Family

ID=10375433

Family Applications (1)

Application Number Title Priority Date Filing Date
GB3523766A Expired GB1212671A (en) 1966-08-05 1966-08-05 Active filters with independent control of the pole and zero locations

Country Status (1)

Country Link
GB (1) GB1212671A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2314475A (en) * 1996-06-21 1997-12-24 Northern Telecom Ltd An operational amplifier connected to a low pass filter with complex pole pairs and having a feedback loop with a real pole to maintain good output impedance
GB2458631A (en) * 2008-03-11 2009-09-30 Oxford Digital Ltd Improving audio equalization and filtering to address problems of disruptive phase response in graphic equalizers
EP2773041A1 (en) * 2013-03-01 2014-09-03 Imec A two stage source-follower based filter

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2314475A (en) * 1996-06-21 1997-12-24 Northern Telecom Ltd An operational amplifier connected to a low pass filter with complex pole pairs and having a feedback loop with a real pole to maintain good output impedance
GB2314475B (en) * 1996-06-21 2000-08-23 Northern Telecom Ltd An operational amplifier filter arrangement
GB2458631A (en) * 2008-03-11 2009-09-30 Oxford Digital Ltd Improving audio equalization and filtering to address problems of disruptive phase response in graphic equalizers
GB2458631B (en) * 2008-03-11 2013-03-20 Oxford Digital Ltd Audio processing
US9203366B2 (en) 2008-03-11 2015-12-01 Oxford Digital Limited Audio processing
EP2773041A1 (en) * 2013-03-01 2014-09-03 Imec A two stage source-follower based filter
US9124251B2 (en) 2013-03-01 2015-09-01 Imec Vzw Two stage source-follower based filter

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Legal Events

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