JPS56131209A - Power amplifying circuit - Google Patents
Power amplifying circuitInfo
- Publication number
- JPS56131209A JPS56131209A JP3553680A JP3553680A JPS56131209A JP S56131209 A JPS56131209 A JP S56131209A JP 3553680 A JP3553680 A JP 3553680A JP 3553680 A JP3553680 A JP 3553680A JP S56131209 A JPS56131209 A JP S56131209A
- Authority
- JP
- Japan
- Prior art keywords
- circuit
- output
- voltage
- amplifier
- pulse
- 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 reduce a circuit loss by obtaining an irreducible necessary power voltage by controlling the output voltage of a variable DC power source corresponding to the peak envelope of output signal amplitude simultaneously with the gain control over an amplifier.
CONSTITUTION: Direct current power source 10 supplying a voltage between power terminals 8 and 9 of main amplifier 5 is a system which performs the pulse-width modulation of the output of DC power source 16 whose output voltage is constant corresponding to the output pulse of pulse-width modulating circuit 11. Meanwhile, the output of preamplifier 2 is amplified by variable gain amplifier 14 whose gain is adjusted by coupling with variable attenuator 4 and then smoothed by rectifying circuit 15 to obtain a modulated control signal, which is supplied to circuit 11. Therefore the voltage at output terminal 6 of amplifier 5 is in inverse proportion to the smoothing output of circuit 15. As a result, the output of circuit 10 is nearly equal to or greater than the output voltage of amplifier 5. In the responding of circuit 15 and the operation of circuit 10, however, there is time lag, so that delay circuit 3 will make time connections of it. Thus, the loss can be reduced by obtaining an irreducible necessary power voltage adequate for the voltage amplitude of amplifier 5.
COPYRIGHT: (C)1981,JPO&Japio
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3553680A JPS56131209A (en) | 1980-03-18 | 1980-03-18 | Power amplifying circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3553680A JPS56131209A (en) | 1980-03-18 | 1980-03-18 | Power amplifying circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS56131209A true JPS56131209A (en) | 1981-10-14 |
Family
ID=12444447
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP3553680A Pending JPS56131209A (en) | 1980-03-18 | 1980-03-18 | Power amplifying circuit |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS56131209A (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS59108376U (en) * | 1983-01-12 | 1984-07-21 | 松下電器産業株式会社 | television receiver |
| JPS59177266U (en) * | 1983-05-16 | 1984-11-27 | 松下電器産業株式会社 | Television receiver audio circuit device |
| WO1994016493A1 (en) * | 1993-01-14 | 1994-07-21 | Marshall Amplification Plc | Audio amplifiers |
| JP2012135015A (en) * | 2008-03-03 | 2012-07-12 | Qualcomm Inc | System and method of reducing power consumption for audio playback |
-
1980
- 1980-03-18 JP JP3553680A patent/JPS56131209A/en active Pending
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS59108376U (en) * | 1983-01-12 | 1984-07-21 | 松下電器産業株式会社 | television receiver |
| JPS59177266U (en) * | 1983-05-16 | 1984-11-27 | 松下電器産業株式会社 | Television receiver audio circuit device |
| WO1994016493A1 (en) * | 1993-01-14 | 1994-07-21 | Marshall Amplification Plc | Audio amplifiers |
| JP2012135015A (en) * | 2008-03-03 | 2012-07-12 | Qualcomm Inc | System and method of reducing power consumption for audio playback |
| JP2016007005A (en) * | 2008-03-03 | 2016-01-14 | クゥアルコム・インコーポレイテッドＱｕａｌｃｏｍｍ Ｉｎｃｏｒｐｏｒａｔｅｄ | System and method of reducing power consumption for audio playback |
| US9425747B2 (en) | 2008-03-03 | 2016-08-23 | Qualcomm Incorporated | System and method of reducing power consumption for audio playback |
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