JPS5680906A - Acoustic power amplifier - Google Patents

Acoustic power amplifier

Info

Publication number
JPS5680906A
JPS5680906A JP15681479A JP15681479A JPS5680906A JP S5680906 A JPS5680906 A JP S5680906A JP 15681479 A JP15681479 A JP 15681479A JP 15681479 A JP15681479 A JP 15681479A JP S5680906 A JPS5680906 A JP S5680906A
Authority
JP
Japan
Prior art keywords
current
circuit
output
type
envelope
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
JP15681479A
Other languages
Japanese (ja)
Inventor
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 JP15681479A priority Critical patent/JPS5680906A/en
Publication of JPS5680906A publication Critical patent/JPS5680906A/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
    • H03F3/30—Single-ended push-pull [SEPP] amplifiers; Phase-splitters therefor
    • H03F3/3001—Single-ended push-pull [SEPP] amplifiers; Phase-splitters therefor with field-effect transistors

Landscapes

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

Abstract

PURPOSE:To obtain high performance of an output amplifier and to miniaturize it by reducing the heating of an output stage by suppressing the generation of distortion during music reproduction by increasing or decreasing the bias current of an output stage transistor according to the envelope amplitude of input music. CONSTITUTION:Load 3 is connected to the output-stage amplifier consisting of N type MOSFET1 and P type MOSFET2 and to this load 3, rectifying circuit 13 and smoothing circuit 14 are also connected so as to detect the envelope amplitude of an output signal. This detected envelope amplitude is converted by voltage-current converting circuit 15 into electric current, which is supplied to terminal 18 of current output type current Miller circuit 16 and terminal 20 of current input type current Miller circuit 17. Then, current proportional to the envelope voltage is led from terminals 18 and 19 of circuit 16 to terminals 20 and 21 of circuit 17 and the current of resistance 12 is increased or decreased in proportion to the envelope voltage to vary biases of FETs 1 and 2, so that the heating is reduced by suppressing the generation of distortion.
JP15681479A 1979-12-05 1979-12-05 Acoustic power amplifier Pending JPS5680906A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP15681479A JPS5680906A (en) 1979-12-05 1979-12-05 Acoustic power amplifier

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP15681479A JPS5680906A (en) 1979-12-05 1979-12-05 Acoustic power amplifier

Publications (1)

Publication Number Publication Date
JPS5680906A true JPS5680906A (en) 1981-07-02

Family

ID=15635905

Family Applications (1)

Application Number Title Priority Date Filing Date
JP15681479A Pending JPS5680906A (en) 1979-12-05 1979-12-05 Acoustic power amplifier

Country Status (1)

Country Link
JP (1) JPS5680906A (en)

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5979613A (en) * 1982-09-24 1984-05-08 エツセジ−エツセ−アテイイ−エツセ・コンポネンテイ・エレツトロニ−チ・ソチエタ・ペル・アノニマ Power amplifier for amplifying audio
JPS5997211A (en) * 1982-11-27 1984-06-05 Matsushita Electric Ind Co Ltd Bias voltage varying circuit
JPS59140704A (en) * 1983-01-31 1984-08-13 Rohm Co Ltd Amplifier circuit
JPS60194813A (en) * 1984-03-16 1985-10-03 Toshiba Corp Crossover distortion reduction circuit
JPS619914U (en) * 1984-06-21 1986-01-21 三洋電機株式会社 power amplifier circuit
WO2002003546A1 (en) * 2000-06-30 2002-01-10 Mitsubishi Denki Kabushiki Kaisha High-frequency amplifier
WO2002003545A1 (en) * 2000-06-30 2002-01-10 Mitsubishi Denki Kabushiki Kaisha High-frequency amplifier

Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5979613A (en) * 1982-09-24 1984-05-08 エツセジ−エツセ−アテイイ−エツセ・コンポネンテイ・エレツトロニ−チ・ソチエタ・ペル・アノニマ Power amplifier for amplifying audio
JPS5997211A (en) * 1982-11-27 1984-06-05 Matsushita Electric Ind Co Ltd Bias voltage varying circuit
JPS59140704A (en) * 1983-01-31 1984-08-13 Rohm Co Ltd Amplifier circuit
JPH0425725B2 (en) * 1983-01-31 1992-05-01 Rohm Kk
JPS60194813A (en) * 1984-03-16 1985-10-03 Toshiba Corp Crossover distortion reduction circuit
JPS619914U (en) * 1984-06-21 1986-01-21 三洋電機株式会社 power amplifier circuit
JPH0533058Y2 (en) * 1984-06-21 1993-08-24
WO2002003546A1 (en) * 2000-06-30 2002-01-10 Mitsubishi Denki Kabushiki Kaisha High-frequency amplifier
WO2002003545A1 (en) * 2000-06-30 2002-01-10 Mitsubishi Denki Kabushiki Kaisha High-frequency amplifier
US6650181B2 (en) 2000-06-30 2003-11-18 Mitsubishi Denki Kabushiki Kaisha High-frequency amplifier
US6873208B2 (en) 2000-06-30 2005-03-29 Mitsubishi Denki Kabushiki Kaisha High-frequency amplifier

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