JPS5526713A - Operation trimming method of active filter - Google Patents

Operation trimming method of active filter

Info

Publication number
JPS5526713A
JPS5526713A JP9899778A JP9899778A JPS5526713A JP S5526713 A JPS5526713 A JP S5526713A JP 9899778 A JP9899778 A JP 9899778A JP 9899778 A JP9899778 A JP 9899778A JP S5526713 A JPS5526713 A JP S5526713A
Authority
JP
Japan
Prior art keywords
phase
signal
active filter
comparator
trimming
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
JP9899778A
Other languages
Japanese (ja)
Inventor
Minoru Yamanishi
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 JP9899778A priority Critical patent/JPS5526713A/en
Publication of JPS5526713A publication Critical patent/JPS5526713A/en
Pending legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03H—IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS
    • H03H3/00—Apparatus or processes specially adapted for the manufacture of impedance networks, resonating circuits, resonators

Abstract

PURPOSE:To shorten the time required for the trimming of an active filter, by using a phase synchronous loop and digital phase detector. CONSTITUTION:A rectiangular-wave signal obtained by comparator 15 from an input signal and a rectangular signal obtained by comparator 13 from the output of active filter 12 are both inputted to phase detector 14, which outputs a difference in phase between both the signals. Further, phase synchronous loop 19 supplies a signal, obtained by multiplying the output of comparator 15 by N, to gate circuit 18. Circuit 18 gates the phase-difference output and passess the N-multiplication signal. This penetrating signal is counted by counter 20 and trimming is carried on until its content reaches a fixed value. Consequently, rapid trimming can be performed.
JP9899778A 1978-08-16 1978-08-16 Operation trimming method of active filter Pending JPS5526713A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP9899778A JPS5526713A (en) 1978-08-16 1978-08-16 Operation trimming method of active filter

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP9899778A JPS5526713A (en) 1978-08-16 1978-08-16 Operation trimming method of active filter

Publications (1)

Publication Number Publication Date
JPS5526713A true JPS5526713A (en) 1980-02-26

Family

ID=14234607

Family Applications (1)

Application Number Title Priority Date Filing Date
JP9899778A Pending JPS5526713A (en) 1978-08-16 1978-08-16 Operation trimming method of active filter

Country Status (1)

Country Link
JP (1) JPS5526713A (en)

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