JPS55147814A - Low output impedance circuit - Google Patents

Low output impedance circuit

Info

Publication number
JPS55147814A
JPS55147814A JP5540679A JP5540679A JPS55147814A JP S55147814 A JPS55147814 A JP S55147814A JP 5540679 A JP5540679 A JP 5540679A JP 5540679 A JP5540679 A JP 5540679A JP S55147814 A JPS55147814 A JP S55147814A
Authority
JP
Japan
Prior art keywords
fet
voltage
gate
potential
constant
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
JP5540679A
Other languages
Japanese (ja)
Other versions
JPH02887B2 (en
Inventor
Kunihiko Goto
Hisami Tanaka
Masayuki Takahashi
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 JP5540679A priority Critical patent/JPS55147814A/en
Publication of JPS55147814A publication Critical patent/JPS55147814A/en
Publication of JPH02887B2 publication Critical patent/JPH02887B2/ja
Granted legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03F—AMPLIFIERS
    • H03F1/00—Details of amplifiers with only discharge tubes, only semiconductor devices or only unspecified devices as amplifying elements
    • H03F1/56—Modifications of input or output impedances, not otherwise provided for

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Amplifiers (AREA)

Abstract

PURPOSE:To make it possible to keep an output voltage fixed even in case of change of a load current, by providing a linear voltage generation element in a part where voltage drop can be ignored and by causing this element to generate voltage change according to fluctuation of the load current and by feeing back this voltage change. CONSTITUTION:Resistance R and MOSFET T1-T3 are provided, and potential V1 of the connection point between FET T1 and T2 is applied to the gate of MOSFET T4. Consequently, FET T4 becomes a variable constant-current source controlled by potential V1. Resistance R is a linear voltage generating element connected between MOSFET T5 and power source Vc, and potential V4 of the connecting point between resisrance R and FET T5 is applied to the gate of FET T3. Constant voltage VB is applied to the gate of FET T1, and FET T1 out of FET T1-T3 which are connected in series between power sources VA and VC functions as a constant current source which flows always constant current I3. Potential V2 of the connecting point between FET T2 and T3 is applied to the gate, and FET T2 functions as a constant-voltage element for level shift.
JP5540679A 1979-05-07 1979-05-07 Low output impedance circuit Granted JPS55147814A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP5540679A JPS55147814A (en) 1979-05-07 1979-05-07 Low output impedance circuit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP5540679A JPS55147814A (en) 1979-05-07 1979-05-07 Low output impedance circuit

Publications (2)

Publication Number Publication Date
JPS55147814A true JPS55147814A (en) 1980-11-18
JPH02887B2 JPH02887B2 (en) 1990-01-09

Family

ID=12997652

Family Applications (1)

Application Number Title Priority Date Filing Date
JP5540679A Granted JPS55147814A (en) 1979-05-07 1979-05-07 Low output impedance circuit

Country Status (1)

Country Link
JP (1) JPS55147814A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5875909A (en) * 1981-10-31 1983-05-07 Mitsubishi Electric Corp Operational amplifying circuit

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5150553A (en) * 1974-10-29 1976-05-04 Tokyo Shibaura Electric Co fet zofukukairo
JPS5168759A (en) * 1974-12-11 1976-06-14 Sony Corp fet anpu
JPS526065A (en) * 1975-07-04 1977-01-18 Nippon Gakki Seizo Kk Transistor composite circuit

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5150553A (en) * 1974-10-29 1976-05-04 Tokyo Shibaura Electric Co fet zofukukairo
JPS5168759A (en) * 1974-12-11 1976-06-14 Sony Corp fet anpu
JPS526065A (en) * 1975-07-04 1977-01-18 Nippon Gakki Seizo Kk Transistor composite circuit

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5875909A (en) * 1981-10-31 1983-05-07 Mitsubishi Electric Corp Operational amplifying circuit
JPS6253083B2 (en) * 1981-10-31 1987-11-09 Mitsubishi Electric Corp

Also Published As

Publication number Publication date
JPH02887B2 (en) 1990-01-09

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