CA1223647A - Filter integrated circuit - Google Patents

Filter integrated circuit

Info

Publication number
CA1223647A
CA1223647A CA000477618A CA477618A CA1223647A CA 1223647 A CA1223647 A CA 1223647A CA 000477618 A CA000477618 A CA 000477618A CA 477618 A CA477618 A CA 477618A CA 1223647 A CA1223647 A CA 1223647A
Authority
CA
Canada
Prior art keywords
circuit
filter
pseudofilter
signal
reference level
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
CA000477618A
Other languages
English (en)
French (fr)
Inventor
Isao Fukushima
Kuniaki Miura
Yoshinori Okada
Kenji Kano
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.)
Hitachi Ltd
Original Assignee
Hitachi 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 Hitachi Ltd filed Critical Hitachi Ltd
Application granted granted Critical
Publication of CA1223647A publication Critical patent/CA1223647A/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
    • H03H11/1291—Current or voltage controlled 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
    • H03H11/1213—Frequency selective two-port networks using amplifiers with feedback using transistor amplifiers
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03H—IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS
    • H03H7/00—Multiple-port networks comprising only passive electrical elements as network components
    • H03H7/01—Frequency selective two-port networks
    • H03H7/0153—Electrical filters; Controlling thereof

Landscapes

  • Networks Using Active Elements (AREA)
  • Filters And Equalizers (AREA)
CA000477618A 1984-04-11 1985-03-27 Filter integrated circuit Expired CA1223647A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP70828/84 1984-04-11
JP59070828A JPS60214617A (ja) 1984-04-11 1984-04-11 フイルタ集積回路

Publications (1)

Publication Number Publication Date
CA1223647A true CA1223647A (en) 1987-06-30

Family

ID=13442824

Family Applications (1)

Application Number Title Priority Date Filing Date
CA000477618A Expired CA1223647A (en) 1984-04-11 1985-03-27 Filter integrated circuit

Country Status (7)

Country Link
US (1) US4667120A (OSRAM)
EP (1) EP0158231B1 (OSRAM)
JP (1) JPS60214617A (OSRAM)
KR (1) KR900001717B1 (OSRAM)
BR (1) BR8501655A (OSRAM)
CA (1) CA1223647A (OSRAM)
DE (1) DE3582513D1 (OSRAM)

Families Citing this family (19)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS61281613A (ja) * 1985-05-20 1986-12-12 Sanyo Electric Co Ltd アクテイブフイルタの自動調整装置
GB2190255B (en) * 1986-04-30 1989-11-29 Philips Electronic Associated Electrical filter
JPH0787332B2 (ja) * 1986-07-18 1995-09-20 株式会社東芝 フイルタ回路の時定数自動調整回路
JP2522275B2 (ja) * 1986-12-27 1996-08-07 ソニー株式会社 フィルタ調整装置
JPH07120923B2 (ja) * 1986-12-27 1995-12-20 ソニー株式会社 フイルタ調整装置
JP2522274B2 (ja) * 1986-12-27 1996-08-07 ソニー株式会社 フィルタ調整装置
JP2522276B2 (ja) * 1986-12-27 1996-08-07 ソニー株式会社 フィルタ調整装置
JPH01183908A (ja) * 1988-01-18 1989-07-21 Nec Ic Microcomput Syst Ltd フィルタ回路
US5023491A (en) * 1988-01-18 1991-06-11 Nec Corporation Filter circuit arrangements with automatic adjustment of cut-off frequencies
JPH01183907A (ja) * 1988-01-18 1989-07-21 Nec Ic Microcomput Syst Ltd フィルタ回路
JPH0693594B2 (ja) * 1989-02-16 1994-11-16 株式会社東芝 アナログフィルタの自動調整回路
US5220220A (en) * 1989-09-20 1993-06-15 Gennum Corporation Noise suppression system
US5392456A (en) * 1989-10-06 1995-02-21 Hitachi, Ltd. Method of controlling filter time constant and filter circuit having the time constant control function based on the method
JPH03175714A (ja) * 1989-12-04 1991-07-30 Nec Corp フィルタ回路
JP2811928B2 (ja) * 1990-07-17 1998-10-15 日本電気株式会社 自動調整フィルタ
DE4025428C2 (de) * 1990-08-10 1994-03-03 Siemens Ag Schaltungsanordnung zur Erzeugung von Steuerspannungen
JP2962800B2 (ja) * 1990-09-29 1999-10-12 三洋電機株式会社 可変バンドパスフィルタの制御回路
US5233245A (en) * 1991-04-10 1993-08-03 General Electric Company Rate controlled noise filter
US7032189B2 (en) * 2002-10-31 2006-04-18 Northrop Grumman Corporation Configurable amplifier array incorporating programmable EHF transmission lines

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3562675A (en) * 1969-05-16 1971-02-09 Sperry Rand Corp Automatic tuned interference signal rejection filter including drift compensation means
JPS574492Y2 (OSRAM) * 1972-05-13 1982-01-27
US3761741A (en) * 1972-06-21 1973-09-25 Signetics Corp Electrically variable impedance utilizing the base emitter junctions of transistors
JPS579530B2 (OSRAM) * 1974-07-08 1982-02-22
CA1033478A (en) * 1974-07-18 1978-06-20 Sanyo Electric Co. Ltd. Automatic tuning apparatus
NL7415210A (en) * 1974-11-21 1976-05-25 Takeda Riken Ind Co Ltd Filter with automatically controlled variable cut off frequency - has output level maintained constant via amplifier with resistive feedback and FET.
US4316108A (en) * 1979-09-25 1982-02-16 Rogers Jr Walter M Tracking filter for FM threshold extension
US4509019A (en) * 1983-01-27 1985-04-02 At&T Bell Laboratories Tunable active filter

Also Published As

Publication number Publication date
EP0158231A2 (en) 1985-10-16
US4667120A (en) 1987-05-19
JPS60214617A (ja) 1985-10-26
JPH0516696B2 (OSRAM) 1993-03-05
DE3582513D1 (de) 1991-05-23
KR900001717B1 (ko) 1990-03-19
EP0158231A3 (en) 1988-01-27
KR850008245A (ko) 1985-12-13
BR8501655A (pt) 1985-12-10
EP0158231B1 (en) 1991-04-17

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Legal Events

Date Code Title Description
MKEX Expiry