JPS57133707A - Bias circuit for power amplifier - Google Patents

Bias circuit for power amplifier

Info

Publication number
JPS57133707A
JPS57133707A JP1980581A JP1980581A JPS57133707A JP S57133707 A JPS57133707 A JP S57133707A JP 1980581 A JP1980581 A JP 1980581A JP 1980581 A JP1980581 A JP 1980581A JP S57133707 A JPS57133707 A JP S57133707A
Authority
JP
Japan
Prior art keywords
trs
voltage
power amplifier
current
gate
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
JP1980581A
Other languages
Japanese (ja)
Inventor
Tadashi Higuchi
Shiyuwarutsu Manfuretsudo
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.)
Sony Corp
Original Assignee
Sony Corp
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 Sony Corp filed Critical Sony Corp
Priority to JP1980581A priority Critical patent/JPS57133707A/en
Publication of JPS57133707A publication Critical patent/JPS57133707A/en
Pending legal-status Critical Current

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  • Amplifiers (AREA)

Abstract

PURPOSE: To achieve a bias circuit for power amplifier using a transistor (TR) of voltage drive, by rejecting nonlinear distortion of the power amplifier without deteriorating various performances of amplifier such as distortion factor.
CONSTITUTION: Current flows from variable current sources 27, 25 in accordance with positive and negative cycles at an audio signal input terminal 1, and the set of initial current of the sources 25, 27 is made at a constant current source 32. A voltage V4 between the gate of an MOS transistor (TR)4 and an output terminal being connecting point of resistors 7, 8, and a voltage V3 between the gate of a TR3 and the output terminal, change as shown in A, currents Ia, Ib of the TRs 3, 4, change as shown in B. Since the TRs 3, 4 are not cut off and the current flowing to TRs 25a, 27a is controlled with the output signal of TRs28, 30 being the voltage detecting circuit, the bias voltage of the TRs 3, 4 is controlled, the upper and lower waveform of current flowing to a load 9 is smoothed to achieve the synthesized output waveform with low distortion.
COPYRIGHT: (C)1982,JPO&Japio
JP1980581A 1981-02-13 1981-02-13 Bias circuit for power amplifier Pending JPS57133707A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP1980581A JPS57133707A (en) 1981-02-13 1981-02-13 Bias circuit for power amplifier

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP1980581A JPS57133707A (en) 1981-02-13 1981-02-13 Bias circuit for power amplifier

Publications (1)

Publication Number Publication Date
JPS57133707A true JPS57133707A (en) 1982-08-18

Family

ID=12009545

Family Applications (1)

Application Number Title Priority Date Filing Date
JP1980581A Pending JPS57133707A (en) 1981-02-13 1981-02-13 Bias circuit for power amplifier

Country Status (1)

Country Link
JP (1) JPS57133707A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS59188208A (en) * 1983-04-08 1984-10-25 Onkyo Corp Power amplifier
JPS61136618U (en) * 1985-02-13 1986-08-25
JP2010028392A (en) * 2008-07-17 2010-02-04 Sanyo Electric Co Ltd Load driving circuit

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS59188208A (en) * 1983-04-08 1984-10-25 Onkyo Corp Power amplifier
JPS61136618U (en) * 1985-02-13 1986-08-25
JP2514066Y2 (en) * 1985-02-13 1996-10-16 暢道 大谷 FET amplifier circuit
JP2010028392A (en) * 2008-07-17 2010-02-04 Sanyo Electric Co Ltd Load driving circuit

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