JPS55149516A - Low pass filter - Google Patents

Low pass filter

Info

Publication number
JPS55149516A
JPS55149516A JP5737379A JP5737379A JPS55149516A JP S55149516 A JPS55149516 A JP S55149516A JP 5737379 A JP5737379 A JP 5737379A JP 5737379 A JP5737379 A JP 5737379A JP S55149516 A JPS55149516 A JP S55149516A
Authority
JP
Japan
Prior art keywords
fet82
resistor
filter
low pass
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.)
Granted
Application number
JP5737379A
Other languages
Japanese (ja)
Other versions
JPH0247129B2 (en
Inventor
Shigetoshi Noda
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 JP5737379A priority Critical patent/JPS55149516A/en
Publication of JPS55149516A publication Critical patent/JPS55149516A/en
Publication of JPH0247129B2 publication Critical patent/JPH0247129B2/ja
Granted 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
    • H03H11/1213—Frequency selective two-port networks using amplifiers with feedback using transistor amplifiers

Landscapes

  • Feedback Control In General (AREA)
  • Control Of Electric Motors In General (AREA)
  • Filters And Equalizers (AREA)
  • Networks Using Active Elements (AREA)
  • Stabilization Of Oscillater, Synchronisation, Frequency Synthesizers (AREA)

Abstract

PURPOSE:To shorten the time up to the servo operation at start, by constituting the low pass filter through the use of the lag-lead type filter having the same transfer function as the active filter at servo lock and the buffer of high impedance. CONSTITUTION:The output terminal of the charge-pump 6 is connected to the control terminal of FET82 via the resistor 81. The output terminal of FET82 is grounded via the resistor 83 and connected to the input terminal of the amplifier 8 via the ripple filter 84. Further, the control terminal of FET82 is grounded via the series circuit of the capacitor 85 and the resistor 86. In this circuit, the lag-lead type filter is constituted with the resistors 81, 86 and the capacitor 85, and the buffer amplifier of high input impedance is constituted with FET82 and the resistor 83.
JP5737379A 1979-05-10 1979-05-10 Low pass filter Granted JPS55149516A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP5737379A JPS55149516A (en) 1979-05-10 1979-05-10 Low pass filter

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP5737379A JPS55149516A (en) 1979-05-10 1979-05-10 Low pass filter

Publications (2)

Publication Number Publication Date
JPS55149516A true JPS55149516A (en) 1980-11-20
JPH0247129B2 JPH0247129B2 (en) 1990-10-18

Family

ID=13053783

Family Applications (1)

Application Number Title Priority Date Filing Date
JP5737379A Granted JPS55149516A (en) 1979-05-10 1979-05-10 Low pass filter

Country Status (1)

Country Link
JP (1) JPS55149516A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH04127389A (en) * 1990-09-19 1992-04-28 Fujitsu Ltd Pi arithmetic circuit of motor driving circuit

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5280808A (en) * 1975-12-27 1977-07-06 Matsushita Electric Ind Co Ltd Filter circuit

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5280808A (en) * 1975-12-27 1977-07-06 Matsushita Electric Ind Co Ltd Filter circuit

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH04127389A (en) * 1990-09-19 1992-04-28 Fujitsu Ltd Pi arithmetic circuit of motor driving circuit

Also Published As

Publication number Publication date
JPH0247129B2 (en) 1990-10-18

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