JPS57160212A - Switched capacitor filter - Google Patents

Switched capacitor filter

Info

Publication number
JPS57160212A
JPS57160212A JP4503181A JP4503181A JPS57160212A JP S57160212 A JPS57160212 A JP S57160212A JP 4503181 A JP4503181 A JP 4503181A JP 4503181 A JP4503181 A JP 4503181A JP S57160212 A JPS57160212 A JP S57160212A
Authority
JP
Japan
Prior art keywords
terminal
switch
capacity
input
grounded
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
JP4503181A
Other languages
Japanese (ja)
Inventor
Seiji Kato
Norio Ueno
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 JP4503181A priority Critical patent/JPS57160212A/en
Publication of JPS57160212A publication Critical patent/JPS57160212A/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 obtain a small coefficient value by using relatively large capacity by performing charge transfer by varying the ratio of input capacity and integral capacity according a filter coefficient supplied externally. CONSTITUTION:All terminals Ta, Tb1, Tb2, and Tn, and Tx1-Tx6 are grounded through switches S1-S4, and SW31-SW36. Then, the switch S4 is opened and the terminal Ta is connected to the side of a signal input terminal 1 through the switch S1; and some of terminals Tx1-Tx6 are grounded through the switches SW31-SW36 according to given filter coefficients, and the remainders are connected to the negative terminal 2 of an operational amplifier A. Further, the terminal Tb1 is connected to the side of the terminal 1 through the switch S2, and the terminal Tb2 is connected to the side of the terminal A of the amplifier through the switch S3. Thus, a signal input from the terminal 1 is smapled at certain repetitive timing in input capacitance constituted by the combination of capacities CA, CB and CX, and after weighting by a constant value, the resulting signal is transferred to a fixed capacitance C12 constituting integral capacity.
JP4503181A 1981-03-27 1981-03-27 Switched capacitor filter Pending JPS57160212A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP4503181A JPS57160212A (en) 1981-03-27 1981-03-27 Switched capacitor filter

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP4503181A JPS57160212A (en) 1981-03-27 1981-03-27 Switched capacitor filter

Publications (1)

Publication Number Publication Date
JPS57160212A true JPS57160212A (en) 1982-10-02

Family

ID=12707963

Family Applications (1)

Application Number Title Priority Date Filing Date
JP4503181A Pending JPS57160212A (en) 1981-03-27 1981-03-27 Switched capacitor filter

Country Status (1)

Country Link
JP (1) JPS57160212A (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6158310A (en) * 1984-08-30 1986-03-25 Seiko Epson Corp Switched capacitor integrator
JPS61177810A (en) * 1985-02-04 1986-08-09 Nec Corp Switched capacitor filter
EP0599557A2 (en) * 1992-11-20 1994-06-01 Nec Corporation Switched capacitor circuit
JP2007288553A (en) * 2006-04-18 2007-11-01 Nippon Telegr & Teleph Corp <Ntt> Switched capacitor circuit

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6158310A (en) * 1984-08-30 1986-03-25 Seiko Epson Corp Switched capacitor integrator
JPS61177810A (en) * 1985-02-04 1986-08-09 Nec Corp Switched capacitor filter
EP0599557A2 (en) * 1992-11-20 1994-06-01 Nec Corporation Switched capacitor circuit
EP0599557A3 (en) * 1992-11-20 1995-09-20 Nec Corp Switched capacitor circuit.
JP2007288553A (en) * 2006-04-18 2007-11-01 Nippon Telegr & Teleph Corp <Ntt> Switched capacitor circuit

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