JPS5683111A - Active filter - Google Patents

Active filter

Info

Publication number
JPS5683111A
JPS5683111A JP16015779A JP16015779A JPS5683111A JP S5683111 A JPS5683111 A JP S5683111A JP 16015779 A JP16015779 A JP 16015779A JP 16015779 A JP16015779 A JP 16015779A JP S5683111 A JPS5683111 A JP S5683111A
Authority
JP
Japan
Prior art keywords
terminal
capacitors
active filter
twin
resistors
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.)
Pending
Application number
JP16015779A
Other languages
Japanese (ja)
Inventor
Kazuhiro Kaneko
Shinpei Matsuzaki
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.)
Fujitsu Ltd
Original Assignee
Fujitsu 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 Fujitsu Ltd filed Critical Fujitsu Ltd
Priority to JP16015779A priority Critical patent/JPS5683111A/en
Publication of JPS5683111A publication Critical patent/JPS5683111A/en
Pending 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

Landscapes

  • Networks Using Active Elements (AREA)

Abstract

PURPOSE:To reduce the required area at circuit integration, by giving specific relation to the 1st and 4-th capacitances of LPF shown in a specific transfer function, in an active filter of the second order polar type having a twin T-circuits consisting of capacitors and a resistors. CONSTITUTION:The 1st terminal of an active filter of the second order polar type having a twin T-circuits consisting of resistors R1-R3 and capacitors C1-C3, is connected to the input terminal 1, the 2nd terminal is to the input terminal 2 of the operational amplifier OPA, and the third terminal is to the output terminal 3 of the operational amplifier OPA respectively, and a capacitor C4 is connected between the terminal 2 of the OPA and ground. Further, the transfer function S(P) of LPF is expressed as equation 1 and the relation between the capacitors C2 and C4 is determined as equation 2. Thus, the number of components is reduced than conventional systems and the required area for circuit integration is made smaller.
JP16015779A 1979-12-10 1979-12-10 Active filter Pending JPS5683111A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP16015779A JPS5683111A (en) 1979-12-10 1979-12-10 Active filter

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP16015779A JPS5683111A (en) 1979-12-10 1979-12-10 Active filter

Publications (1)

Publication Number Publication Date
JPS5683111A true JPS5683111A (en) 1981-07-07

Family

ID=15709094

Family Applications (1)

Application Number Title Priority Date Filing Date
JP16015779A Pending JPS5683111A (en) 1979-12-10 1979-12-10 Active filter

Country Status (1)

Country Link
JP (1) JPS5683111A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6149515A (en) * 1984-08-17 1986-03-11 Toyo Commun Equip Co Ltd Active filter

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6149515A (en) * 1984-08-17 1986-03-11 Toyo Commun Equip Co Ltd Active filter

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