JPS56157115A - Switched capacitor filter - Google Patents

Switched capacitor filter

Info

Publication number
JPS56157115A
JPS56157115A JP5942080A JP5942080A JPS56157115A JP S56157115 A JPS56157115 A JP S56157115A JP 5942080 A JP5942080 A JP 5942080A JP 5942080 A JP5942080 A JP 5942080A JP S56157115 A JPS56157115 A JP S56157115A
Authority
JP
Japan
Prior art keywords
capacitor
integrator
plus
filter
resistances
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
JP5942080A
Other languages
Japanese (ja)
Inventor
Izumi Kawakami
Tomokazu Komazaki
Atsushi Komori
Seiichiro Kozuka
Toshinori Tsuboi
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.)
Nippon Telegraph and Telephone Corp
Oki Electric Industry Co Ltd
Original Assignee
Nippon Telegraph and Telephone Corp
Oki Electric Industry 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 Nippon Telegraph and Telephone Corp, Oki Electric Industry Co Ltd filed Critical Nippon Telegraph and Telephone Corp
Priority to JP5942080A priority Critical patent/JPS56157115A/en
Publication of JPS56157115A publication Critical patent/JPS56157115A/en
Pending legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03H—IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS
    • H03H19/00—Networks using time-varying elements, e.g. N-path filters
    • H03H19/004—Switched capacitor networks

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Filters That Use Time-Delay Elements (AREA)

Abstract

PURPOSE:To prevent an increase of voltage for the output of each integrator, by using a capacitor having a constant transmission function of an equivalent leapfrog type active filter and decided with different resistance values for an LC simulation- type switched capacitor filter which is suited for an LSI formation. CONSTITUTION:A switched capacitor filter SCF2 is formed by replacing the resistance of an integrator in a leapfrog type active filter 1 which functions as an equivalent circuit in an LC filter circuit with a capacitor C and a switch SW. The 1st integrator consists of an operational amplifier AMP1, resistances R1-R3 plus a capacitor C1; the 2nd integrator consists of an operational amplifier AMP2, resistances R4 and R5 plus a capacitor C3; and the 3rd integrator consists of an operational amplifier AMP3, resistances R6 and R7 plus a capacitor C4 respectively. In such constitution, the condition under which the transmission function is constant between the input and output is obtained along with the value with which R1, R2 and R7 are 1 and R3-R6 are not 1. Thus an increase of voltage is prevented for the output of an integrator. Then an SCF is constituted with a switch having a capacitor value equivalent to the resistance plus a switch frequency.
JP5942080A 1980-05-07 1980-05-07 Switched capacitor filter Pending JPS56157115A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP5942080A JPS56157115A (en) 1980-05-07 1980-05-07 Switched capacitor filter

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP5942080A JPS56157115A (en) 1980-05-07 1980-05-07 Switched capacitor filter

Publications (1)

Publication Number Publication Date
JPS56157115A true JPS56157115A (en) 1981-12-04

Family

ID=13112745

Family Applications (1)

Application Number Title Priority Date Filing Date
JP5942080A Pending JPS56157115A (en) 1980-05-07 1980-05-07 Switched capacitor filter

Country Status (1)

Country Link
JP (1) JPS56157115A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4920325A (en) * 1987-03-05 1990-04-24 Sgs-Thomson Microelectronics S.P.A. Integrated active electronic switched capacitor filter having extremely low sensitivity to variations of the components
JPH05275974A (en) * 1992-03-30 1993-10-22 Japan Radio Co Ltd Switched capacitor filter

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4920325A (en) * 1987-03-05 1990-04-24 Sgs-Thomson Microelectronics S.P.A. Integrated active electronic switched capacitor filter having extremely low sensitivity to variations of the components
JPH05275974A (en) * 1992-03-30 1993-10-22 Japan Radio Co Ltd Switched capacitor filter

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