JPS55120213A - Switched capacitor filter - Google Patents

Switched capacitor filter

Info

Publication number
JPS55120213A
JPS55120213A JP2837579A JP2837579A JPS55120213A JP S55120213 A JPS55120213 A JP S55120213A JP 2837579 A JP2837579 A JP 2837579A JP 2837579 A JP2837579 A JP 2837579A JP S55120213 A JPS55120213 A JP S55120213A
Authority
JP
Japan
Prior art keywords
capacitor
control circuit
memory
alpha1
beta2
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
JP2837579A
Other languages
Japanese (ja)
Inventor
Mitsuo Tsunoishi
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 JP2837579A priority Critical patent/JPS55120213A/en
Publication of JPS55120213A publication Critical patent/JPS55120213A/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 miniaturize a switched capacitor filter and reduce the price by incorporating a control circuit with a memory function in a semiconductor substrate forming a basic filter block. CONSTITUTION:On a semiconductor substrate, a general basic filter block which has the variable constant of a transfer function is formed and control circuit CNT with a memory function is incorporated in the substrate. According to desired filter characteristics, constants alpha1, alpha2, beta1 and beta2 are determined and a capacitor to be selected is determined correspondingly. Connection/disconnection data of this capacitor are stored in the memory part of control circuit CNT. Next, the contents of the memory are read out, the selected capacitor is connected, and constants alpha1 to beta2 are set to desired values, thereby setting desired filter characteristics. Thus, integrated circuits can be mass-produced, and consequently while its price is reduced, the number of pins is also reduced, so that it can be miniaturized.
JP2837579A 1979-03-12 1979-03-12 Switched capacitor filter Pending JPS55120213A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP2837579A JPS55120213A (en) 1979-03-12 1979-03-12 Switched capacitor filter

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP2837579A JPS55120213A (en) 1979-03-12 1979-03-12 Switched capacitor filter

Publications (1)

Publication Number Publication Date
JPS55120213A true JPS55120213A (en) 1980-09-16

Family

ID=12246881

Family Applications (1)

Application Number Title Priority Date Filing Date
JP2837579A Pending JPS55120213A (en) 1979-03-12 1979-03-12 Switched capacitor filter

Country Status (1)

Country Link
JP (1) JPS55120213A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS592417A (en) * 1982-06-29 1984-01-09 Fujitsu Ltd Electronic variable attenuation circuit
US4862121A (en) * 1987-08-13 1989-08-29 Texas Instruments Incorporated Switched capacitor filter

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS592417A (en) * 1982-06-29 1984-01-09 Fujitsu Ltd Electronic variable attenuation circuit
JPH0126565B2 (en) * 1982-06-29 1989-05-24 Fujitsu Ltd
US4862121A (en) * 1987-08-13 1989-08-29 Texas Instruments Incorporated Switched capacitor filter

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