JPH10341114A - Power supply switching device for amplifier - Google Patents
Power supply switching device for amplifierInfo
- Publication number
- JPH10341114A JPH10341114A JP9150987A JP15098797A JPH10341114A JP H10341114 A JPH10341114 A JP H10341114A JP 9150987 A JP9150987 A JP 9150987A JP 15098797 A JP15098797 A JP 15098797A JP H10341114 A JPH10341114 A JP H10341114A
- Authority
- JP
- Japan
- Prior art keywords
- power supply
- voltage
- supply voltage
- transistor
- amplifier
- 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
(57)【要約】
【課題】 消費電力を低減するために、増幅器の出力信
号電圧の変化に対応して増幅器に供給する電源電圧を切
り換える電源電圧切換装置において、電圧切り換え時に
発生する高周波ノイズを抑制し、出力信号へのノイズの
重畳を低減する。
【解決手段】 トランジスタ14のベースに印加する基準
電圧より、トランジスタ13のベースに印加される信号増
幅器２の出力検出電圧が高くなるとトランジスタ７をオ
ンにし、一定の遅延時間後、電源電圧切換トランジスタ
３をオンにして高電圧側電源を信号増幅器２に接続す
る。トランジスタ13のベース電圧がトランジスタ14のベ
ース電圧より下がると、トランジスタ７をオフにし、一
定の遅延時間後、電源電圧切換トランジスタ３をオフに
して、低電圧側電源を接続する。電圧切り換えの立上
り、立下りに傾斜を持たせる。
(57) Abstract: A power supply voltage switching device that switches a power supply voltage supplied to an amplifier in response to a change in an output signal voltage of the amplifier in order to reduce power consumption. Suppress and reduce the superimposition of noise on the output signal. SOLUTION: When the output detection voltage of the signal amplifier 2 applied to the base of the transistor 13 becomes higher than the reference voltage applied to the base of the transistor 14, the transistor 7 is turned on. After a certain delay time, the power supply voltage switching transistor 3 is turned on. Is turned on to connect the high voltage side power supply to the signal amplifier 2. When the base voltage of the transistor 13 falls below the base voltage of the transistor 14, the transistor 7 is turned off, and after a certain delay time, the power supply voltage switching transistor 3 is turned off to connect the low voltage side power supply. The rising and falling of the voltage switching is provided with a slope.
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、増幅器の電源電圧
切換装置に関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a power supply voltage switching device for an amplifier.
【０００２】[0002]
【従来の技術】従来、増幅器においては、消費電力を低
減する目的で、増幅器の出力電圧の変化に対応して電源
電圧を切り換える回路を付加したものが知られている。2. Description of the Related Art Conventionally, there has been known an amplifier provided with a circuit for switching a power supply voltage in response to a change in an output voltage of the amplifier in order to reduce power consumption.
【０００３】例えば、図２において、増幅器の出力信号
波形25において、その電圧が予め設定した電圧(以下切
換設定電圧という)26以下では低い電源電圧Ｖ1が供給さ
れ、切換設定電圧26以上になると高い電源電圧Ｖ2が供
給される。これにより、消費電力を低減することができ
る。For example, in FIG. 2, the output signal waveform 25 of the amplifier, the voltage is low supply voltages V 1 is supplied with preset voltage (hereinafter referred to as switch setting voltage) 26 or less, at a higher switch setting voltage 26 high supply voltage V 2 is supplied. Thereby, power consumption can be reduced.
【０００４】[0004]
【発明が解決しようとする課題】しかしながら、このよ
うに構成された従来例では、電源電圧切換曲線27で示し
たように、切り換わる電源電圧の立上り、立下りが急峻
であり、その結果、電源電圧切り換え時に高周波ノイズ
が発生して、これが出力信号に重畳し、出力信号の歪率
を悪化させてしまうという問題があった。However, in the conventional example configured as described above, as shown by the power supply voltage switching curve 27, the rising and falling of the switching power supply voltage is steep. There has been a problem that high-frequency noise is generated at the time of voltage switching and is superimposed on an output signal, thereby deteriorating the distortion rate of the output signal.
【０００５】本発明は、このような従来の問題点を解決
し、出力信号の歪率を悪化させずに電源電圧の切り換え
を行い、消費電力を低減するようにした増幅器の電源電
圧切換装置を提供することを目的とする。The present invention solves the above-mentioned conventional problems and provides a power supply voltage switching device for an amplifier in which the power supply voltage is switched without deteriorating the distortion rate of an output signal to reduce power consumption. The purpose is to provide.
【０００６】[0006]
【課題を解決するための手段】上記目的を達成するため
に、本発明は、信号増幅器の出力信号電圧の変化に対応
して信号増幅器に供給する電源電圧を切り換える電源電
圧切換装置に、電源電圧の切換速度を遅延させる回路を
設けたものである。To achieve the above object, the present invention provides a power supply voltage switching device for switching a power supply voltage supplied to a signal amplifier in response to a change in an output signal voltage of the signal amplifier. Is provided with a circuit for delaying the switching speed.
【０００７】この構成によれば、切り換わる電源電圧の
立上り、立下りに傾斜を持たせて高周波ノイズの発生を
抑制することができ、また、電源電圧が高電圧から低電
圧に切り換わる時間を任意に設定、つまり時定数を適宜
設定した場合、高い周波数の信号が連続的に入力してい
る時は、出力信号から見た相対的切り換わり速度は周波
数が高くなるほど遅くなるので、最終的には切り換えが
行われなくなる。このようにして、出力信号の歪率を悪
化させずに電源電圧の切り換えを行い、消費電力を低減
することができる。According to this configuration, it is possible to suppress the occurrence of high-frequency noise by giving rise and fall to the slope of the switching power supply voltage, and to reduce the time for the power supply voltage to switch from high voltage to low voltage. If the time constant is set arbitrarily, that is, the time constant is set appropriately, when a high frequency signal is continuously input, the relative switching speed as seen from the output signal becomes slower as the frequency becomes higher. Will not be switched. In this way, the power supply voltage can be switched without deteriorating the distortion rate of the output signal, and power consumption can be reduced.
【０００８】[0008]
【発明の実施の形態】以下、本発明の実施の形態につい
て、図面を参照しながら詳細に説明する。図１は本発明
の一実施の形態における電源電圧切換装置の回路を示し
たものであり、１は信号入力端子、２は信号増幅器、３
は電源電圧切換トランジスタ、４，６および５は遅延時
間を設定する抵抗およびコンデンサ、９，10は信号増幅
器２の出力電圧を検出する抵抗、11，12は電圧切り換え
の基準電圧を設定する抵抗、７，13，14は電圧切換制御
用のトランジスタ、18は逆流防止用のダイオード、19は
高電圧側電源端子、20は低電圧側電源端子、21は出力端
子である。Embodiments of the present invention will be described below in detail with reference to the drawings. FIG. 1 shows a circuit of a power supply voltage switching device according to an embodiment of the present invention, wherein 1 is a signal input terminal, 2 is a signal amplifier, 3
Is a power supply voltage switching transistor, 4, 6 and 5 are resistors and capacitors for setting a delay time, 9 and 10 are resistors for detecting the output voltage of the signal amplifier 2, 11 and 12 are resistors for setting a reference voltage for voltage switching, Reference numerals 7, 13, and 14 denote transistors for controlling voltage switching, 18 denotes a diode for preventing backflow, 19 denotes a high voltage side power supply terminal, 20 denotes a low voltage side power supply terminal, and 21 denotes an output terminal.
【０００９】次に本実施の形態における動作を説明す
る。トランジスタ14のベースには低電圧側電源端子20に
供給された電圧により設定された電圧切り換えの基準電
圧が印加される。また、トランジスタ13のベースには信
号増幅器２の出力信号の電圧を検出した電圧が印加され
る。そこで、トランジスタ13のベース電位が、トランジ
スタ14のベース電位より高くなると、トランジスタ７が
オンになり、コンデンサ５および抵抗６で決定される時
定数分だけ遅れて電源電圧切換トランジスタ３がオンに
なる。その結果、信号増幅器２には、高電圧側電源端子
19を介して高電圧側電源が接続される。Next, the operation of this embodiment will be described. A reference voltage for voltage switching set by the voltage supplied to the low voltage side power supply terminal 20 is applied to the base of the transistor 14. A voltage detected from the voltage of the output signal of the signal amplifier 2 is applied to the base of the transistor 13. Therefore, when the base potential of the transistor 13 becomes higher than the base potential of the transistor 14, the transistor 7 is turned on, and the power supply voltage switching transistor 3 is turned on with a delay by a time constant determined by the capacitor 5 and the resistor 6. As a result, the signal amplifier 2 has a high voltage side power supply terminal.
The high voltage side power supply is connected via 19.
【００１０】次に、トランジスタ13のベース電位がトラ
ンジスタ14のベース電位より低くなると、トランジスタ
７がオフとなり、コンデンサ５と抵抗４の時定数分だけ
遅れて電源電圧切換トランジスタ３がオフとなり、信号
増幅器２の電源の接続を、高電圧側電源から低電圧側電
源に切り換える。Next, when the base potential of the transistor 13 becomes lower than the base potential of the transistor 14, the transistor 7 is turned off, and the power supply voltage switching transistor 3 is turned off with a delay of the time constant of the capacitor 5 and the resistor 4, and the signal amplifier is turned off. The connection of the power supply 2 is switched from the high-voltage power supply to the low-voltage power supply.
【００１１】図２における破線で示した電源電圧切換曲
線28は、切換速度を遅延させた時の応答である。増幅器
の出力信号周波数が低い時は、電圧切り換わり時の立上
り、立下りが傾斜を持ち、その結果、発生する高周波ノ
イズが抑制され、出力信号へのノイズの重畳が低減され
るとともに、出力信号波形25に追従して信号出力電圧が
低いときは電源電圧も低くなるので、消費電力を低減す
ることができる。A power supply voltage switching curve 28 shown by a broken line in FIG. 2 is a response when the switching speed is delayed. When the output signal frequency of the amplifier is low, the rise and fall at the time of voltage switching have a slope. As a result, high-frequency noise generated is suppressed, noise superimposition on the output signal is reduced, and the output signal is reduced. When the signal output voltage is low following the waveform 25, the power supply voltage is also low, so that power consumption can be reduced.
【００１２】図３は、出力信号周波数が高い時の出力信
号波形と電源電圧の関係を示したものである。遅延時間
を設定する抵抗４，６およびコンデンサ５に所望の時定
数を持たせると、電源電圧切り換えの時定数は絶対値で
あるから、出力信号周波数が高い時は、出力信号波形25
から見た時の相対的な電源電圧の切り換わり時間が遅く
なり、電源電圧を切り換わりにくくしている。さらに高
い信号周波数時においては、電源電圧は切り換わらなく
なる。FIG. 3 shows the relationship between the output signal waveform and the power supply voltage when the output signal frequency is high. When the resistors 4 and 6 and the capacitor 5 for setting the delay time have desired time constants, the time constant for switching the power supply voltage is an absolute value. Therefore, when the output signal frequency is high, the output signal waveform 25
The relative switching time of the power supply voltage when viewed from the side is delayed, making it difficult to switch the power supply voltage. At a higher signal frequency, the power supply voltage does not switch.
【００１３】[0013]
【発明の効果】以上説明したように本発明によれば、電
源電圧の切換速度を適宜遅延させることで、切り換え時
の高周波ノイズの発生を抑制することができ、従って、
出力信号へのノイズの重畳を少なくして、歪率の小さい
出力信号を得ることができる。しかも、出力信号電圧の
変化に対応して電源電圧を切り換えるので、消費電力を
低減することができるという効果を奏するものである。As described above, according to the present invention, the occurrence of high frequency noise at the time of switching can be suppressed by appropriately delaying the switching speed of the power supply voltage.
It is possible to obtain an output signal having a small distortion rate by reducing the superposition of noise on the output signal. In addition, since the power supply voltage is switched in response to the change in the output signal voltage, the power consumption can be reduced.
【図１】本発明の一実施の形態における増幅器の電源電
圧切換装置の回路図である。FIG. 1 is a circuit diagram of a power supply voltage switching device for an amplifier according to an embodiment of the present invention.
【図２】出力信号周波数が低い時の出力信号波形と電源
電圧との関係を示す図である。FIG. 2 is a diagram illustrating a relationship between an output signal waveform and a power supply voltage when an output signal frequency is low.
【図３】出力信号周波数が高い時の出力信号波形と電源
電圧との関係を示す図である。FIG. 3 is a diagram illustrating a relationship between an output signal waveform and a power supply voltage when an output signal frequency is high.
２…信号増幅器、 ３…電源電圧切換トランジスタ、
４,６…遅延時定数を設定する抵抗、 ５…遅延時定数
を設定するコンデンサ、 ７,13,14…トランジスタ、
９,10…増幅器の出力電圧を検出する抵抗、 11,12…電
圧切り換えの基準電圧を設定する抵抗、 18…逆流防止
用のダイオード、 19…高電圧側電源端子、 20…低電
圧側電源端子、 21…出力端子。2 ... signal amplifier 3 ... power supply voltage switching transistor
4, 6: resistor for setting delay time constant, 5: capacitor for setting delay time constant, 7, 13, 14 ... transistor,
9,10: resistor for detecting the output voltage of the amplifier, 11,12: resistor for setting the reference voltage for voltage switching, 18 ... diode for backflow prevention, 19 ... high voltage side power supply terminal, 20 ... low voltage side power supply terminal , 21… Output terminal.
Claims (2)
して前記信号増幅器に供給する電源電圧を切り換える電
源電圧切換装置であって、電源電圧の切換速度を遅延さ
せる回路を有することを特徴とする増幅器の電源電圧切
換装置。1. A power supply voltage switching device for switching a power supply voltage supplied to a signal amplifier in response to a change in an output signal voltage of the signal amplifier, comprising a circuit for delaying a power supply voltage switching speed. Power supply voltage switching device for the amplifier.
は、切り換わる電源電圧の立上り、立下りに傾斜を持た
せるとともに、高い周波数の信号が連続的に入力してい
る時は、電源電圧切り換えが行われないように時定数を
設定することを特徴とする請求項１記載の増幅器の電源
電圧切換装置。2. A circuit for delaying a switching speed of a power supply voltage, wherein the switching power supply voltage has a rising and falling slope, and when a high frequency signal is continuously input, the power supply voltage switching is performed. 2. The power supply voltage switching device for an amplifier according to claim 1, wherein a time constant is set so that the step is not performed.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP9150987A JPH10341114A (en) | 1997-06-09 | 1997-06-09 | Power supply switching device for amplifier |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP9150987A JPH10341114A (en) | 1997-06-09 | 1997-06-09 | Power supply switching device for amplifier |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH10341114A true JPH10341114A (en) | 1998-12-22 |
Family
ID=15508815
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP9150987A Pending JPH10341114A (en) | 1997-06-09 | 1997-06-09 | Power supply switching device for amplifier |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH10341114A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2009152904A (en) * | 2007-12-20 | 2009-07-09 | Fujitsu Ltd | Power amplifier |
| JP2012135015A (en) * | 2008-03-03 | 2012-07-12 | Qualcomm Inc | System and method of reducing power consumption for audio playback |
| US8717211B2 (en) | 2010-11-30 | 2014-05-06 | Qualcomm Incorporated | Adaptive gain adjustment system |
-
1997
- 1997-06-09 JP JP9150987A patent/JPH10341114A/en active Pending
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2009152904A (en) * | 2007-12-20 | 2009-07-09 | Fujitsu Ltd | Power amplifier |
| US8154341B2 (en) | 2007-12-20 | 2012-04-10 | Fujitsu Limited | Power amplifying apparatus |
| CN101465621B (en) | 2007-12-20 | 2012-05-16 | 富士通株式会社 | Power amplifier |
| 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 for 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 |
| JP2018129848A (en) * | 2008-03-03 | 2018-08-16 | 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 |
| US8717211B2 (en) | 2010-11-30 | 2014-05-06 | Qualcomm Incorporated | Adaptive gain adjustment system |
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