JPS55110419A - Rc active filter - Google Patents

Rc active filter

Info

Publication number
JPS55110419A
JPS55110419A JP1882579A JP1882579A JPS55110419A JP S55110419 A JPS55110419 A JP S55110419A JP 1882579 A JP1882579 A JP 1882579A JP 1882579 A JP1882579 A JP 1882579A JP S55110419 A JPS55110419 A JP S55110419A
Authority
JP
Japan
Prior art keywords
capacitor
terminal
input terminal
cut
taken
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
JP1882579A
Other languages
Japanese (ja)
Inventor
Mitsutoshi Ito
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.)
NEC Corp
Original Assignee
NEC Corp
Nippon Electric Co 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 NEC Corp, Nippon Electric Co Ltd filed Critical NEC Corp
Priority to JP1882579A priority Critical patent/JPS55110419A/en
Publication of JPS55110419A publication Critical patent/JPS55110419A/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 establish BPF having the fourth cut-off characteristics substantially with high selectivity, by connecting the first capacitor to the input terminal, grounding the one end, and connecting the second capacitor and taking another end as new input terminal. CONSTITUTION:In RC active filter suitable to obtain the tuning characteristics higher in the selectivity, the capacitor 17 is connected to the input terminal 13 and one end is grounded, the capacitor 16 is connected and another end is taken as the new input terminal 15. The T-type circuit network consisting of CR circuit is formed between the terminal 15 and the input summing point 18 of the operational amplifier 1, and the summing point 18 is taken as a virtual ground with parallel feedback effect. Further, the capacitance is taken as C16>C17, and the transmission frequency characteristics from the terminal 15 to the terminal 13 show the band- pass characteristics having the low cut-off frequency fL and the high cut-off frequency fH. Thus, BPF having substantially the fourth order cut-off characteristics and higher selectivity can be obtained by adding further two capacitors to the active filter.
JP1882579A 1979-02-20 1979-02-20 Rc active filter Pending JPS55110419A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP1882579A JPS55110419A (en) 1979-02-20 1979-02-20 Rc active filter

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP1882579A JPS55110419A (en) 1979-02-20 1979-02-20 Rc active filter

Publications (1)

Publication Number Publication Date
JPS55110419A true JPS55110419A (en) 1980-08-25

Family

ID=11982329

Family Applications (1)

Application Number Title Priority Date Filing Date
JP1882579A Pending JPS55110419A (en) 1979-02-20 1979-02-20 Rc active filter

Country Status (1)

Country Link
JP (1) JPS55110419A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2018067907A (en) * 2016-08-12 2018-04-26 ザ・ボーイング・カンパニーＴｈｅ Ｂｏｅｉｎｇ Ｃｏｍｐａｎｙ Active bandpass filter circuit with adjustable resistance device and adjustable capacitance device

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2018067907A (en) * 2016-08-12 2018-04-26 ザ・ボーイング・カンパニーＴｈｅ Ｂｏｅｉｎｇ Ｃｏｍｐａｎｙ Active bandpass filter circuit with adjustable resistance device and adjustable capacitance device

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