JPS55138905A - Bias circuit of amplifier - Google Patents

Bias circuit of amplifier

Info

Publication number
JPS55138905A
JPS55138905A JP4696779A JP4696779A JPS55138905A JP S55138905 A JPS55138905 A JP S55138905A JP 4696779 A JP4696779 A JP 4696779A JP 4696779 A JP4696779 A JP 4696779A JP S55138905 A JPS55138905 A JP S55138905A
Authority
JP
Japan
Prior art keywords
voltage
amplified
amplifier
differential amplifier
bias
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
JP4696779A
Other languages
Japanese (ja)
Inventor
Ryuichi Fukuda
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 Columbia Co Ltd
Original Assignee
Nippon Columbia 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 Columbia Co Ltd filed Critical Nippon Columbia Co Ltd
Priority to JP4696779A priority Critical patent/JPS55138905A/en
Publication of JPS55138905A publication Critical patent/JPS55138905A/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
    • H03F1/0261—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 polarisation voltage or current, e.g. gliding Class A

Abstract

PURPOSE:Not only to make an amplifier perform class A amplification but also to elevate its efficiency, irrespective of magnitude of the load impedance, by deciding the bias depending upon the signal current component of the amplifier output. CONSTITUTION:The transistors 4, 5 are subjected to class A bias, perform a complementary action mutually, and AC voltage applied to the load 14 is produced between the terminals 15, 16. This AC voltage is applied to the differential amplifier 10 and is amplified furthermore, after it has been amplified, it is applied to the peak detector 11, and it is converted to a DC signal after both the wave peaks have been detected. This DC signal becomes a differential output by being amplified by the differential amplifier 12, and is applied to the base of the transistors 4, 5. Resulting from the foregoing, DC voltage is produced between the terminals 17, 18. This DC voltage is fed back as negative to the inverted input terminal of the differential amplifier 12 after it has been amplified by the differential amplifier 13. The bias voltage is controlled depending upon the signal level by the aforesaid negative feedback action.
JP4696779A 1979-04-17 1979-04-17 Bias circuit of amplifier Pending JPS55138905A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP4696779A JPS55138905A (en) 1979-04-17 1979-04-17 Bias circuit of amplifier

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP4696779A JPS55138905A (en) 1979-04-17 1979-04-17 Bias circuit of amplifier

Publications (1)

Publication Number Publication Date
JPS55138905A true JPS55138905A (en) 1980-10-30

Family

ID=12762030

Family Applications (1)

Application Number Title Priority Date Filing Date
JP4696779A Pending JPS55138905A (en) 1979-04-17 1979-04-17 Bias circuit of amplifier

Country Status (1)

Country Link
JP (1) JPS55138905A (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5797209A (en) * 1980-12-08 1982-06-16 Marantz Japan Inc Power amplifying circuit
EP0054938A1 (en) * 1980-12-23 1982-06-30 Zdzislaw Gulczynski Power amplifier with quiescent current regulator
FR2533779A1 (en) * 1982-09-24 1984-03-30 Ates Componenti Elettron AUDIO FREQUENCY POWER AMPLIFIER WITH AUTOMATIC REGULATION OF THE POLARIZATION CURRENT ABSORBED BY THE FINAL STAGE
GB2482338A (en) * 2010-07-30 2012-02-01 Just Audio Ltd Portable headphone amplifier with user-selectable bias

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5797209A (en) * 1980-12-08 1982-06-16 Marantz Japan Inc Power amplifying circuit
EP0054938A1 (en) * 1980-12-23 1982-06-30 Zdzislaw Gulczynski Power amplifier with quiescent current regulator
FR2533779A1 (en) * 1982-09-24 1984-03-30 Ates Componenti Elettron AUDIO FREQUENCY POWER AMPLIFIER WITH AUTOMATIC REGULATION OF THE POLARIZATION CURRENT ABSORBED BY THE FINAL STAGE
GB2482338A (en) * 2010-07-30 2012-02-01 Just Audio Ltd Portable headphone amplifier with user-selectable bias

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