JPS57176813A - Amplifier - Google Patents
AmplifierInfo
- Publication number
- JPS57176813A JPS57176813A JP56062895A JP6289581A JPS57176813A JP S57176813 A JPS57176813 A JP S57176813A JP 56062895 A JP56062895 A JP 56062895A JP 6289581 A JP6289581 A JP 6289581A JP S57176813 A JPS57176813 A JP S57176813A
- Authority
- JP
- Japan
- Prior art keywords
- circuit
- output
- current
- speaker
- clip
- 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.)
- Granted
Links
Abstract
PURPOSE: To prevent clip and distortion of power waveform by detecting the current level of an output signal of a power amplifier circuit and providing a current detection circuit that generates output at a specified level or above and operating a control circuit by this circuit output.
CONSTITUTION: When speaker impedance is Z<4Ω, a current detection circuit 16 operates, and if the current flowing in a speaker 15 is within the range that does not generate clip, that is 12W, a power amplifier circuit 12 is in A-class condition. When the current value exceeds the above value, output V0 appears in the current detection circuit 16. By this, a comparator 17→a monostable multivibrator 18→a control circuit 19 operate successively, and three electronic switches S1, S2, S3 are turned on, and becomes AB-class ∼ B-class condition. Accordingly, even if the load of the main amplifier, that is, the impedance of the speaker changes to the direction of decrease, clip is not generated by this, and distortion is not caused.
COPYRIGHT: (C)1982,JPO&Japio
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP56062895A JPS57176813A (en) | 1981-04-24 | 1981-04-24 | Amplifier |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP56062895A JPS57176813A (en) | 1981-04-24 | 1981-04-24 | Amplifier |
Publications (2)
Publication Number | Publication Date |
---|---|
JPS57176813A true JPS57176813A (en) | 1982-10-30 |
JPH0474884B2 JPH0474884B2 (en) | 1992-11-27 |
Family
ID=13213433
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP56062895A Granted JPS57176813A (en) | 1981-04-24 | 1981-04-24 | Amplifier |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS57176813A (en) |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5963805A (en) * | 1982-10-04 | 1984-04-11 | Hideo Ikeda | Amplifier device |
JPS6139706A (en) * | 1984-07-31 | 1986-02-25 | Matsushita Electric Ind Co Ltd | Output limit device of power amplifier |
JP2013005447A (en) * | 2011-06-17 | 2013-01-07 | Analog Devices Inc | Method and apparatus for biasing rail-to-rail dmos amplifier output stage |
-
1981
- 1981-04-24 JP JP56062895A patent/JPS57176813A/en active Granted
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5963805A (en) * | 1982-10-04 | 1984-04-11 | Hideo Ikeda | Amplifier device |
JPS6139706A (en) * | 1984-07-31 | 1986-02-25 | Matsushita Electric Ind Co Ltd | Output limit device of power amplifier |
JP2013005447A (en) * | 2011-06-17 | 2013-01-07 | Analog Devices Inc | Method and apparatus for biasing rail-to-rail dmos amplifier output stage |
Also Published As
Publication number | Publication date |
---|---|
JPH0474884B2 (en) | 1992-11-27 |
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