JPS55121732A - Biquad filter - Google Patents

Biquad filter

Info

Publication number
JPS55121732A
JPS55121732A JP2920479A JP2920479A JPS55121732A JP S55121732 A JPS55121732 A JP S55121732A JP 2920479 A JP2920479 A JP 2920479A JP 2920479 A JP2920479 A JP 2920479A JP S55121732 A JPS55121732 A JP S55121732A
Authority
JP
Japan
Prior art keywords
resistances
amplifiers
plus
input terminals
biquad filter
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
JP2920479A
Other languages
Japanese (ja)
Inventor
Hiroshi Shimizu
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 JP2920479A priority Critical patent/JPS55121732A/en
Publication of JPS55121732A publication Critical patent/JPS55121732A/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
    • H03H11/1217—Frequency selective two-port networks using amplifiers with feedback using a plurality of operational amplifiers
    • H03H11/1252—Two integrator-loop-filters

Landscapes

  • Networks Using Active Elements (AREA)

Abstract

PURPOSE:To obtain a biquad filter featuring more reduced amount of the thermal noise and the simple circuit design in case the integration is carried out by decreasing the number of elements. CONSTITUTION:The biquad filter consists of three operational amplifiers 11-13, eight resistances 21-28 plus two capacitors 29, 30. The parallel circuit of capacitors 29, 30 plus resistance 21 and resistance 22 give the feedback to the output signal to minus input terminal. Resistances 23, 24 and 25 supply the output signals of operational amplifiers 13, 11 and 12 to the minus input terminals of amplifiers 11, 12 and 13 respectively. At the same time, resistances 26, 27 and 28 supply input signal VIN to minus input terminals of amplifiers 13, 12 and 11 each. Furthermore, the plus input terminals of the operational amplifiers are earthed.
JP2920479A 1979-03-13 1979-03-13 Biquad filter Pending JPS55121732A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP2920479A JPS55121732A (en) 1979-03-13 1979-03-13 Biquad filter

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP2920479A JPS55121732A (en) 1979-03-13 1979-03-13 Biquad filter

Publications (1)

Publication Number Publication Date
JPS55121732A true JPS55121732A (en) 1980-09-19

Family

ID=12269658

Family Applications (1)

Application Number Title Priority Date Filing Date
JP2920479A Pending JPS55121732A (en) 1979-03-13 1979-03-13 Biquad filter

Country Status (1)

Country Link
JP (1) JPS55121732A (en)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS58161413A (en) * 1982-03-18 1983-09-26 Sony Corp Multi-purpose filter
US4581607A (en) * 1983-02-18 1986-04-08 Nissan Motor Company, Ltd. System and method for detecting driver drowsiness of a vehicle
US4611199A (en) * 1983-02-18 1986-09-09 Nissan Motor Company Alarm system and method for sensing a stand-by state in a driver drowsiness detection system
JPS63167509A (en) * 1986-12-29 1988-07-11 Sony Corp Filter circuit
JP2011142373A (en) * 2010-01-05 2011-07-21 Renesas Electronics Corp Semiconductor integrated circuit, and radio communication terminal mounted with the same

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS58161413A (en) * 1982-03-18 1983-09-26 Sony Corp Multi-purpose filter
JPH0570966B2 (en) * 1982-03-18 1993-10-06 Sony Corp
US4581607A (en) * 1983-02-18 1986-04-08 Nissan Motor Company, Ltd. System and method for detecting driver drowsiness of a vehicle
US4611199A (en) * 1983-02-18 1986-09-09 Nissan Motor Company Alarm system and method for sensing a stand-by state in a driver drowsiness detection system
JPS63167509A (en) * 1986-12-29 1988-07-11 Sony Corp Filter circuit
JP2011142373A (en) * 2010-01-05 2011-07-21 Renesas Electronics Corp Semiconductor integrated circuit, and radio communication terminal mounted with the same

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