JPS5765912A - Differential amplifying circuit - Google Patents

Differential amplifying circuit

Info

Publication number
JPS5765912A
JPS5765912A JP14257280A JP14257280A JPS5765912A JP S5765912 A JPS5765912 A JP S5765912A JP 14257280 A JP14257280 A JP 14257280A JP 14257280 A JP14257280 A JP 14257280A JP S5765912 A JPS5765912 A JP S5765912A
Authority
JP
Japan
Prior art keywords
constant current
current circuit
differential amplifying
amplifying circuit
emitter
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
JP14257280A
Other languages
Japanese (ja)
Inventor
Ryuichi Fukuda
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.)
Nippon Columbia Co Ltd
Original Assignee
Nippon Columbia Co 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 Nippon Columbia Co Ltd filed Critical Nippon Columbia Co Ltd
Priority to JP14257280A priority Critical patent/JPS5765912A/en
Publication of JPS5765912A publication Critical patent/JPS5765912A/en
Pending legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03F—AMPLIFIERS
    • H03F3/00—Amplifiers with only discharge tubes or only semiconductor devices as amplifying elements
    • H03F3/45—Differential amplifiers
    • H03F3/45071—Differential amplifiers with semiconductor devices only
    • H03F3/45479—Differential amplifiers with semiconductor devices only characterised by the way of common mode signal rejection

Landscapes

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

Abstract

PURPOSE:To improve the ratio of elimination of inphase components, by driving one end of a constant current circuit, which has the other end connected to the emitter of a differential amplifying circuit, while following an input signal. CONSTITUTION:A point A of a constant current circuit 5 has the potential controlled while following an input signal. Since the constant current circuit 5 is connected to the emitter of a transistor 3, the level difference between both ends of the constant current circuit 5 is hardly fluctuated. Consequently, even if the impedance of the constant current circuit 5 is finite, the current value is not fluctuated, and the ratio of elimination of inphase components is improved.
JP14257280A 1980-10-13 1980-10-13 Differential amplifying circuit Pending JPS5765912A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP14257280A JPS5765912A (en) 1980-10-13 1980-10-13 Differential amplifying circuit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP14257280A JPS5765912A (en) 1980-10-13 1980-10-13 Differential amplifying circuit

Publications (1)

Publication Number Publication Date
JPS5765912A true JPS5765912A (en) 1982-04-21

Family

ID=15318438

Family Applications (1)

Application Number Title Priority Date Filing Date
JP14257280A Pending JPS5765912A (en) 1980-10-13 1980-10-13 Differential amplifying circuit

Country Status (1)

Country Link
JP (1) JPS5765912A (en)

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