JPS5668010A - Power amplifier - Google Patents

Power amplifier

Info

Publication number
JPS5668010A
JPS5668010A JP14369679A JP14369679A JPS5668010A JP S5668010 A JPS5668010 A JP S5668010A JP 14369679 A JP14369679 A JP 14369679A JP 14369679 A JP14369679 A JP 14369679A JP S5668010 A JPS5668010 A JP S5668010A
Authority
JP
Japan
Prior art keywords
amplifier
transistor
circuit
output
transistors
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
JP14369679A
Other languages
Japanese (ja)
Inventor
Masaru Ida
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 JP14369679A priority Critical patent/JPS5668010A/en
Publication of JPS5668010A publication Critical patent/JPS5668010A/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

Landscapes

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

Abstract

PURPOSE:To increase the absolute value of a gain according to an increase in the absolute value of a signal level by providing a negative feedback circuit to a switching circuit in an amplifier where an electric power voltage to be supplied to an output-stage amplifying element is changed over according to the signal level of an input or output. CONSTITUTION:The power amplifier is composed of the driving circuit composed of the output-stage amplifying element of transistors 31 and 32, the switching circuit composed of amplifier 38 and negative feedback circuit 50 composed of resistances 41 and 42 and capacitor 43, and differential amplifier 53 composed of transistors 51 and 52. With the output of circuit 53 in this constitution, transistor 54 and also transistor 55 are driven to supply the voltage, developed at the emitter of transistor 55 to the collector of transistor 31 via coil 40 and also to feed it back to the base of transistor 52 of amplifier 53 via circuit 50. Thus, the gain of amplifier 38 is increased and diode unit 45 connected to amplifier 52 is allowed to rise smoothly, reducing noises.
JP14369679A 1979-11-06 1979-11-06 Power amplifier Pending JPS5668010A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP14369679A JPS5668010A (en) 1979-11-06 1979-11-06 Power amplifier

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP14369679A JPS5668010A (en) 1979-11-06 1979-11-06 Power amplifier

Publications (1)

Publication Number Publication Date
JPS5668010A true JPS5668010A (en) 1981-06-08

Family

ID=15344829

Family Applications (1)

Application Number Title Priority Date Filing Date
JP14369679A Pending JPS5668010A (en) 1979-11-06 1979-11-06 Power amplifier

Country Status (1)

Country Link
JP (1) JPS5668010A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS58147207A (en) * 1982-02-26 1983-09-02 Pioneer Electronic Corp Power supply circuit of amplifier
US4518928A (en) * 1981-12-15 1985-05-21 Pioneer Electronic Corporation Power supply circuit for amplifier

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4518928A (en) * 1981-12-15 1985-05-21 Pioneer Electronic Corporation Power supply circuit for amplifier
JPS58147207A (en) * 1982-02-26 1983-09-02 Pioneer Electronic Corp Power supply circuit of amplifier
JPH0338764B2 (en) * 1982-02-26 1991-06-11 Pioneer Electronic Corp

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