JPS5471544A - Direct coupling amplifier - Google Patents

Direct coupling amplifier

Info

Publication number
JPS5471544A
JPS5471544A JP13862677A JP13862677A JPS5471544A JP S5471544 A JPS5471544 A JP S5471544A JP 13862677 A JP13862677 A JP 13862677A JP 13862677 A JP13862677 A JP 13862677A JP S5471544 A JPS5471544 A JP S5471544A
Authority
JP
Japan
Prior art keywords
amplifier
gate
potential
direct coupling
output
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
JP13862677A
Other languages
Japanese (ja)
Inventor
Motoomi Goto
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 Gakki Co Ltd
Original Assignee
Nippon Gakki 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 Gakki Co Ltd filed Critical Nippon Gakki Co Ltd
Priority to JP13862677A priority Critical patent/JPS5471544A/en
Publication of JPS5471544A publication Critical patent/JPS5471544A/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 prevent the drift of differential amplifying circuit from being taken place, by making equal the DC potential of non-inverting and inverting input, in the direct coupling amplifier performing non-inversion amplification providing the differential amplifying circuit. CONSTITUTION:The signal path of the direct coupling amplifier A is constituted with the input stage 1 consisting of differential amplifier having FETQ1, Q2, exciting stage 2 having the bipolar transister TRQ3, and output stage 3 having TrQ4, Q5. The DC potential of the gate of Q1 being the non-inverting terminal is detected with the resistor 20 and the capacitor 21, and the output is converted into rectangular wave with TRQo to which the rectangular wave signal is applied and it is DC signal with smoothing of capacitor C2s via the AC amplifier 23 and the synchronous linear detector TRQ7. This output is divided with the resistors 18 and 26 and is fed to the gate of Q2 being the inverting input. When the amplifier of the amplifier 23 or the resistor 26 is adjusted and the DC potential of the gate 7 of Q1, Q2 is made equal, then the drift of the differential amplifier can be prevented.
JP13862677A 1977-11-18 1977-11-18 Direct coupling amplifier Pending JPS5471544A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP13862677A JPS5471544A (en) 1977-11-18 1977-11-18 Direct coupling amplifier

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP13862677A JPS5471544A (en) 1977-11-18 1977-11-18 Direct coupling amplifier

Publications (1)

Publication Number Publication Date
JPS5471544A true JPS5471544A (en) 1979-06-08

Family

ID=15226451

Family Applications (1)

Application Number Title Priority Date Filing Date
JP13862677A Pending JPS5471544A (en) 1977-11-18 1977-11-18 Direct coupling amplifier

Country Status (1)

Country Link
JP (1) JPS5471544A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5635508A (en) * 1979-08-31 1981-04-08 Toshiba Corp Signal processing circuit

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5635508A (en) * 1979-08-31 1981-04-08 Toshiba Corp Signal processing circuit

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