JPS5668010A - Power amplifier - Google Patents
Power amplifierInfo
- 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
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.
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)
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 |
-
1979
- 1979-11-06 JP JP14369679A patent/JPS5668010A/en active Pending
Cited By (3)
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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