JPS56131210A - Power amplifying circuit - Google Patents
Power amplifying circuitInfo
- Publication number
- JPS56131210A JPS56131210A JP3553580A JP3553580A JPS56131210A JP S56131210 A JPS56131210 A JP S56131210A JP 3553580 A JP3553580 A JP 3553580A JP 3553580 A JP3553580 A JP 3553580A JP S56131210 A JPS56131210 A JP S56131210A
- Authority
- JP
- Japan
- Prior art keywords
- voltage
- amplifier
- pulse
- output
- circuit
- 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 supplying an irreducible necessary power voltage to an amplifier by controlling the output voltage of a variable DC voltage source simultaneously with gain control over the amplifier.
CONSTITUTION: To supply DC voltage sources ±Vc to terminals 5 and 6 of main amplifier 4, pulse-width modulation system power source 11 performs the pulse- width modulation of the output of DC power source 10 corresponding to the output pulse of pulse-width modulating circuit 9. For the output voltage of this power source 10, this output voltage is compared by error detecting circuit 15 with the reference voltage obtained by dividing a constant voltage applied to terminal 12 through resistor 13 and variable resistor 14, and the output pulse width of circuit 9 is so controlled that the difference will be zero. Variable attenuator 3 controlling the gain of the said amplifier and resistor 14 are coupled with each other and then made controllable from the outside, so that voltages ±Vc can be varied corresponding to the output voltage of amplifier 4.
COPYRIGHT: (C)1981,JPO&Japio
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3553580A JPS56131210A (en) | 1980-03-18 | 1980-03-18 | Power amplifying circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3553580A JPS56131210A (en) | 1980-03-18 | 1980-03-18 | Power amplifying circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS56131210A true JPS56131210A (en) | 1981-10-14 |
Family
ID=12444420
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP3553580A Pending JPS56131210A (en) | 1980-03-18 | 1980-03-18 | Power amplifying circuit |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS56131210A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2010536197A (en) * | 2007-08-03 | 2010-11-25 | ウォルフソン・マイクロエレクトロニクス・ピーエルシー | Amplifier circuit |
| JP2011515918A (en) * | 2008-03-03 | 2011-05-19 | クゥアルコム・インコーポレイテッド | System and method for reducing power consumption for audio playback |
| US8717211B2 (en) | 2010-11-30 | 2014-05-06 | Qualcomm Incorporated | Adaptive gain adjustment system |
-
1980
- 1980-03-18 JP JP3553580A patent/JPS56131210A/en active Pending
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2010536197A (en) * | 2007-08-03 | 2010-11-25 | ウォルフソン・マイクロエレクトロニクス・ピーエルシー | Amplifier circuit |
| JP2013141302A (en) * | 2007-08-03 | 2013-07-18 | Wolfson Microelectronics Plc | Amplifier circuit |
| JP2011515918A (en) * | 2008-03-03 | 2011-05-19 | クゥアルコム・インコーポレイテッド | System and method for reducing power consumption for audio playback |
| JP2014060731A (en) * | 2008-03-03 | 2014-04-03 | 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 |
| US8717211B2 (en) | 2010-11-30 | 2014-05-06 | Qualcomm Incorporated | Adaptive gain adjustment system |
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