JPS57129014A - Code switching low-pass filter - Google Patents

Code switching low-pass filter

Info

Publication number
JPS57129014A
JPS57129014A JP1409981A JP1409981A JPS57129014A JP S57129014 A JPS57129014 A JP S57129014A JP 1409981 A JP1409981 A JP 1409981A JP 1409981 A JP1409981 A JP 1409981A JP S57129014 A JPS57129014 A JP S57129014A
Authority
JP
Japan
Prior art keywords
resistor
capacitor
input terminal
amplifier
pass filter
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
JP1409981A
Other languages
Japanese (ja)
Inventor
Hiroyuki Fujikura
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.)
Sony Corp
Original Assignee
Sony Corp
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 Sony Corp filed Critical Sony Corp
Priority to JP1409981A priority Critical patent/JPS57129014A/en
Publication of JPS57129014A publication Critical patent/JPS57129014A/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
    • H03H11/12—Frequency selective two-port networks using amplifiers with feedback
    • H03H11/126—Frequency selective two-port networks using amplifiers with feedback using a single operational amplifier
    • H03H11/1278—Modifications to reduce detrimental influences of amplifier imperfections, e.g. limited gain-bandwith product, limited input impedance

Landscapes

  • Networks Using Active Elements (AREA)

Abstract

PURPOSE:To simplify the constitution and to reduce generation of a drift and a noise, by decreasing the number of operational amplifiers to one. CONSTITUTION:An input signal is supplied to both a negative input terminal and a positive input terminal of an operational amplifier 24 through the first resistor 22 and the second resistor 23. The positive input terminal of this amplifier 24 is grounded through a parallel circuit of a junction FET 25 constituting the first switch, and a capacitor 26. Also, a parallel circuit consisting of a junction FET 27 constituting the second switch, a capacitor 28 and the third resistor 29 is connected between the output terminal and the negative input terminal of the amplifier 24. Also, resistance values of the resistor 22 and 29 are made equal. Furthermore, the product of a resistance value of the resistor 23 and a capacity value of the capacitor 26 is made equal to the product of a resistance value of the resistor 29 and a capacity value of the capacitor 28. In this way, in accordance with a code control input, said first and second switches are turned on alternately.
JP1409981A 1981-02-02 1981-02-02 Code switching low-pass filter Pending JPS57129014A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP1409981A JPS57129014A (en) 1981-02-02 1981-02-02 Code switching low-pass filter

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP1409981A JPS57129014A (en) 1981-02-02 1981-02-02 Code switching low-pass filter

Publications (1)

Publication Number Publication Date
JPS57129014A true JPS57129014A (en) 1982-08-10

Family

ID=11851662

Family Applications (1)

Application Number Title Priority Date Filing Date
JP1409981A Pending JPS57129014A (en) 1981-02-02 1981-02-02 Code switching low-pass filter

Country Status (1)

Country Link
JP (1) JPS57129014A (en)

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