JPS54157459A - Amplifier circuit - Google Patents

Amplifier circuit

Info

Publication number
JPS54157459A
JPS54157459A JP6581278A JP6581278A JPS54157459A JP S54157459 A JPS54157459 A JP S54157459A JP 6581278 A JP6581278 A JP 6581278A JP 6581278 A JP6581278 A JP 6581278A JP S54157459 A JPS54157459 A JP S54157459A
Authority
JP
Japan
Prior art keywords
diode
current
input
bias voltage
same time
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
JP6581278A
Other languages
Japanese (ja)
Inventor
Nobutaka Amada
Gichu Oota
Shigeki Inoue
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.)
Hitachi Ltd
Original Assignee
Hitachi 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 Hitachi Ltd filed Critical Hitachi Ltd
Priority to JP6581278A priority Critical patent/JPS54157459A/en
Publication of JPS54157459A publication Critical patent/JPS54157459A/en
Pending 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
    • H03F1/02—Modifications of amplifiers to raise the efficiency, e.g. gliding Class A stages, use of an auxiliary oscillation
    • H03F1/0205—Modifications of amplifiers to raise the efficiency, e.g. gliding Class A stages, use of an auxiliary oscillation in transistor amplifiers
    • H03F1/0211—Modifications of amplifiers to raise the efficiency, e.g. gliding Class A stages, use of an auxiliary oscillation in transistor amplifiers with control of the supply voltage or current
    • H03F1/0244—Stepped control

Abstract

PURPOSE:To obtain a high-efficiency amplifier circuit featuring the steady idle current and an improved distortion factor by applying the bias voltage to the output transistor and at the same time supplying a constant current to the saturation preventing diode. CONSTITUTION:Diode 14 and 15 are connected between the input of output transistor Tr10/12 and 11/13. At the same time, the bias voltage caused by diode 18 is applied directly between the base and the emitter of Tr10 and 11 to compensate the temperature of them. As diode 14 and 15 are not inserted into the input of Tr10 and 11, the idle current of Tr10 and 11 is not affected at all by the temperature characteristics of diode 14 and 15. Furthermore, the DC current large enough compared with the signal current is supplied to diode 14 and 15 via driving circuit 2, and thus the operation resistance does not change substantially. Accordingly, the transmission characteristics is not fluctuated with supply of the input signal to Tr10 and 11, with no distortion caused.
JP6581278A 1978-06-02 1978-06-02 Amplifier circuit Pending JPS54157459A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP6581278A JPS54157459A (en) 1978-06-02 1978-06-02 Amplifier circuit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP6581278A JPS54157459A (en) 1978-06-02 1978-06-02 Amplifier circuit

Publications (1)

Publication Number Publication Date
JPS54157459A true JPS54157459A (en) 1979-12-12

Family

ID=13297803

Family Applications (1)

Application Number Title Priority Date Filing Date
JP6581278A Pending JPS54157459A (en) 1978-06-02 1978-06-02 Amplifier circuit

Country Status (1)

Country Link
JP (1) JPS54157459A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5970307A (en) * 1982-10-15 1984-04-20 Matsushita Electric Ind Co Ltd Amplifier
US4472688A (en) * 1982-06-09 1984-09-18 Trio Kabushiki Kaisha Amplifier circuit
EP1241780A3 (en) * 2001-03-15 2004-09-22 Bluetek Co Limited Audio power amplifying apparatus and method

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4472688A (en) * 1982-06-09 1984-09-18 Trio Kabushiki Kaisha Amplifier circuit
JPS5970307A (en) * 1982-10-15 1984-04-20 Matsushita Electric Ind Co Ltd Amplifier
EP1241780A3 (en) * 2001-03-15 2004-09-22 Bluetek Co Limited Audio power amplifying apparatus and method
US7123730B2 (en) 2001-03-15 2006-10-17 Bluetek Co., Ltd. Audio power amplifying apparatus and method

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