JPS5511640A - Power amplifier - Google Patents

Power amplifier

Info

Publication number
JPS5511640A
JPS5511640A JP8417378A JP8417378A JPS5511640A JP S5511640 A JPS5511640 A JP S5511640A JP 8417378 A JP8417378 A JP 8417378A JP 8417378 A JP8417378 A JP 8417378A JP S5511640 A JPS5511640 A JP S5511640A
Authority
JP
Japan
Prior art keywords
base
forming
base potential
transistor
resistance
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
JP8417378A
Other languages
Japanese (ja)
Other versions
JPS6231523B2 (en
Inventor
Masashi Shoji
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.)
NEC Corp
Original Assignee
NEC Corp
Nippon Electric 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 NEC Corp, Nippon Electric Co Ltd filed Critical NEC Corp
Priority to JP8417378A priority Critical patent/JPS5511640A/en
Publication of JPS5511640A publication Critical patent/JPS5511640A/en
Publication of JPS6231523B2 publication Critical patent/JPS6231523B2/ja
Granted 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
    • H03F3/30—Single-ended push-pull [SEPP] amplifiers; Phase-splitters therefor

Landscapes

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

Abstract

PURPOSE:To secure the normal operation for the push-pull circuit of the output step by giving control to both the base potential of the transistor which supplies the signal and the base potential of the transistor of the next step. CONSTITUTION:The amplifier circuit consists of emitter follower transistor 12, Tr14 and 15 forming a differential amplifier, Tr22 forming a preamplifier, Tr25 and 26 forming a complementary Tr, and others. In such amplifier circuit, the base of Tr12 is connected to input terminal 2 through resistance 7, and the emitter is connected to the base of Tr14 via backward diode 10. In case the negative excessive signal is applied to terminal 2, the forward collector-base current of Tr12 is supplied through resistance 7. Thus the base potential is controlled to the lower level than the collectorpotential as well as heighten the base potential of Tr14 with a level shift equivalent to the forward voltage amount of diode 10. As a result, Tr14 is never saturated, and accordingly the nonconductive state or insufficient driving is never given to Tr22 and 26. And therefore, no abnormal output waveform is produced.
JP8417378A 1978-07-10 1978-07-10 Power amplifier Granted JPS5511640A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP8417378A JPS5511640A (en) 1978-07-10 1978-07-10 Power amplifier

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP8417378A JPS5511640A (en) 1978-07-10 1978-07-10 Power amplifier

Publications (2)

Publication Number Publication Date
JPS5511640A true JPS5511640A (en) 1980-01-26
JPS6231523B2 JPS6231523B2 (en) 1987-07-09

Family

ID=13823092

Family Applications (1)

Application Number Title Priority Date Filing Date
JP8417378A Granted JPS5511640A (en) 1978-07-10 1978-07-10 Power amplifier

Country Status (1)

Country Link
JP (1) JPS5511640A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5663673A (en) * 1994-06-30 1997-09-02 Fujitsu Limited Output circuit having at least one external transistor

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH01150154U (en) * 1988-04-04 1989-10-17
JP6933797B2 (en) * 2017-02-20 2021-09-08 オンキヨーホームエンターテイメント株式会社 Audio amplifier and audio power amplifier

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5663673A (en) * 1994-06-30 1997-09-02 Fujitsu Limited Output circuit having at least one external transistor

Also Published As

Publication number Publication date
JPS6231523B2 (en) 1987-07-09

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