JPS5583321A - Filter available for selective variation in frequency characteristic - Google Patents

Filter available for selective variation in frequency characteristic

Info

Publication number
JPS5583321A
JPS5583321A JP15838578A JP15838578A JPS5583321A JP S5583321 A JPS5583321 A JP S5583321A JP 15838578 A JP15838578 A JP 15838578A JP 15838578 A JP15838578 A JP 15838578A JP S5583321 A JPS5583321 A JP S5583321A
Authority
JP
Japan
Prior art keywords
capacitors
capacitor
frequency characteristics
switching
constitution
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
JP15838578A
Other languages
Japanese (ja)
Inventor
Norio Ueno
Seiji Kato
Shinpei Matsuzaki
Mitsuo Tsunoishi
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 JP15838578A priority Critical patent/JPS5583321A/en
Publication of JPS5583321A publication Critical patent/JPS5583321A/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

Landscapes

  • Filters That Use Time-Delay Elements (AREA)

Abstract

PURPOSE:To vary frequency characteristics by selectively connecting auxiliary capacitor by exercising control over switching element on a common substrate under external control. CONSTITUTION:In a filter where capacitors CA1-CA8 connected to a signal input terminal and earth terminal by switching are arranged and connected by switching at a fixed clock frequency, auxiliary capacitors CAS1-CAS8 are provided in parallel to respective capacitors and then connected via switches S1-S8. A capacitor with a small value among capacitors determining frequency characteristics is regarded as a main capacitor, and a difference among respective capacitors corresponding to respective characteristics is considered to be the value of an auxiliary capacitor. For example, switches employ MOSFETs and are controlled by applying a direct- current voltage to gate electrodes. In this constitution, extremely-easy and selective variation in frequency characteristics can be done and all elements are arranged on the common substrate, so that miniature and excellent characteristic filters can be mass-produced.
JP15838578A 1978-12-19 1978-12-19 Filter available for selective variation in frequency characteristic Pending JPS5583321A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP15838578A JPS5583321A (en) 1978-12-19 1978-12-19 Filter available for selective variation in frequency characteristic

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP15838578A JPS5583321A (en) 1978-12-19 1978-12-19 Filter available for selective variation in frequency characteristic

Publications (1)

Publication Number Publication Date
JPS5583321A true JPS5583321A (en) 1980-06-23

Family

ID=15670555

Family Applications (1)

Application Number Title Priority Date Filing Date
JP15838578A Pending JPS5583321A (en) 1978-12-19 1978-12-19 Filter available for selective variation in frequency characteristic

Country Status (1)

Country Link
JP (1) JPS5583321A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4924189A (en) * 1987-08-26 1990-05-08 L'etat Francais, Represente Par La Ministre Delegue Des Postes Et Telecommunications, (Centre National D'etudes Des Telecommunications) Two-port switched capacitor filter netowrk with linearized phase/frequency response

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4924189A (en) * 1987-08-26 1990-05-08 L'etat Francais, Represente Par La Ministre Delegue Des Postes Et Telecommunications, (Centre National D'etudes Des Telecommunications) Two-port switched capacitor filter netowrk with linearized phase/frequency response

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