JPS57133707A - Bias circuit for power amplifier - Google Patents
Bias circuit for power amplifierInfo
- 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
Links
Landscapes
- 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
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)
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 |
-
1981
- 1981-02-13 JP JP1980581A patent/JPS57133707A/en active Pending
Cited By (4)
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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