JPH0543204B2 - - Google Patents
Info
- Publication number
- JPH0543204B2 JPH0543204B2 JP8741486A JP8741486A JPH0543204B2 JP H0543204 B2 JPH0543204 B2 JP H0543204B2 JP 8741486 A JP8741486 A JP 8741486A JP 8741486 A JP8741486 A JP 8741486A JP H0543204 B2 JPH0543204 B2 JP H0543204B2
- Authority
- JP
- Japan
- Prior art keywords
- distortion
- signal
- level
- time constant
- generation 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.)
- Expired - Lifetime
Links
- 230000003321 amplification Effects 0.000 claims description 4
- 238000003199 nucleic acid amplification method Methods 0.000 claims description 4
- 230000002159 abnormal effect Effects 0.000 description 6
- 230000000630 rising effect Effects 0.000 description 3
- 230000005540 biological transmission Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 230000005284 excitation Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 1
- 230000001771 impaired effect Effects 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 230000001052 transient effect Effects 0.000 description 1
- 230000007704 transition Effects 0.000 description 1
Description
【発明の詳細な説明】
〔産業上の利用分野〕
本発明は線形化電力増幅装置に関し、特に自動
出力レベル制御された歪発生回路を用いる線形化
電力増幅装置に関する。DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a linearized power amplifier, and more particularly to a linearized power amplifier that uses a distortion generation circuit with automatic output level control.
電力増幅器は、飽和出力レベル付近で使用すれ
ば大きな出力が得られ、また電力効率も高くなる
が、この場合信号に振幅変調成分があると非線形
歪を発生する。
If a power amplifier is used near the saturation output level, a large output can be obtained and the power efficiency will also be high, but in this case, nonlinear distortion will occur if the signal contains an amplitude modulation component.
無線通信において、専有周波数幅に対して大き
い情報量を伝送して電波の有効利用をはかるため
に多値直交振幅変調方式が用いられている。多値
直交振幅変調波は大きな振幅変調成分があるの
で、かかる方式の無線送信機の最終段である電力
増幅器を飽和出力レベル付近で使用すると、電力
増幅器の非線形歪で符号間干渉を発生し、伝送品
質が劣化する。 In wireless communications, a multilevel orthogonal amplitude modulation method is used to transmit a large amount of information over a dedicated frequency width and to effectively utilize radio waves. Since multilevel orthogonal amplitude modulation waves have large amplitude modulation components, if the power amplifier, which is the final stage of such a wireless transmitter, is used near the saturation output level, intersymbol interference will occur due to nonlinear distortion of the power amplifier. Transmission quality deteriorates.
電力増幅器の前段に歪発生回路を備え、この歪
発生回路で電力増幅器が発生する非直線歪を補償
するような歪を発生させることにより増幅動作を
線形化して、飽和出力レベル付近においても全体
としての非線形歪を無くするようにした線形化電
力増幅装置が知られている（たとえば、特開昭58
−14608号公報）。 A distortion generation circuit is provided before the power amplifier, and this distortion generation circuit generates distortion that compensates for the nonlinear distortion generated by the power amplifier, thereby linearizing the amplification operation and improving the overall performance even near the saturation output level. A linearized power amplifier device that eliminates nonlinear distortion is known (for example, Japanese Patent Laid-Open No. 58
-14608 Publication).
かかる線形化電力増幅装置において、歪発生回
路の平均値として動作レベルを一定にする必要が
あるので、通常その前段に最終段の電力増幅器に
対する励振電力の増幅を行い、かつ、その励新電
力のレベルを一定に制御する機能を有するドライ
バ増幅器であるレベル制御回路を備えて、歪発生
回路の入力レベルを一定に保つ。このレベル制御
回路の自動出力レベル制御の時定数は、信号の振
幅変動の最大周期より十分大きい値に設定され
る。またこのレベル制御回路は、入力信号の投入
時、自動出力レベル制御動作の収束する前に過渡
的に出力レベルが過大になるのを防止するため
に、入力信号断の間は最小利得の状態で待機し入
力信号が投入されると自動出力レベル制御の時定
数で利得が上昇するようになされている。 In such a linearized power amplifier, since it is necessary to keep the operating level constant as the average value of the distortion generation circuit, the excitation power for the final stage power amplifier is usually amplified in the preceding stage, and the excitation power is A level control circuit, which is a driver amplifier having a function of controlling the level to a constant level, is provided to keep the input level of the distortion generation circuit constant. The time constant for automatic output level control of this level control circuit is set to a value sufficiently larger than the maximum cycle of amplitude fluctuations of the signal. In addition, this level control circuit maintains the minimum gain state while the input signal is turned off, in order to prevent the output level from becoming transiently excessive before the automatic output level control operation converges when the input signal is turned on. When it is on standby and an input signal is applied, the gain is increased by the time constant of automatic output level control.
歪発生回路の（平均値としての）入出力レベル
差、すなわち利得が変動すると、電力増幅器の
（平均値としての）入力レベルが変動して歪発生
回路の歪補償動作が損われるので、歪発生回路も
自動出力レベル制御されることが多い。この自動
出力レベル制御の時定数も、信号の振幅変動の最
大周期より十分大きい値に設定される。 If the input/output level difference (as an average value) of the distortion generation circuit, that is, the gain fluctuates, the input level (as an average value) of the power amplifier will fluctuate, impairing the distortion compensation operation of the distortion generation circuit. Circuits also often have automatic output level control. The time constant of this automatic output level control is also set to a value sufficiently larger than the maximum cycle of amplitude fluctuations of the signal.
かかる従来の線形化電力増幅装置は、レベル制
御回路の自動出力レベル制御の時定数と歪発生回
路の自動出力レベル制御の時定数との間の関係に
ついては何等考慮されていないので、信号の投入
時に、歪発生回路の自動出力レベル制御動作が収
束するより早くレベル制御回路の出力レベルが立
上り、その結果歪発生回路の動作レベルが狂つて
歪発生動作が正常でなくなり、電力増幅器から異
常な歪を出力するおそれがあるという欠点があ
る。
In such conventional linearized power amplifier devices, no consideration is given to the relationship between the time constant of automatic output level control of the level control circuit and the time constant of automatic output level control of the distortion generation circuit, so that it is difficult to input the signal. Sometimes, the output level of the level control circuit rises faster than the automatic output level control operation of the distortion generation circuit converges, and as a result, the operation level of the distortion generation circuit goes out of order, the distortion generation operation becomes abnormal, and abnormal distortion is generated from the power amplifier. The disadvantage is that there is a risk of outputting.
本発明の目的は、上記欠点を解決して信号投入
時にも異常な歪を出力するおそれのない線形化電
力増幅装置を提供することにある。 SUMMARY OF THE INVENTION An object of the present invention is to provide a linearized power amplification device that solves the above-mentioned drawbacks and is free from the possibility of outputting abnormal distortion even when a signal is input.
本発明の線形化電力増幅装置は、出力レベルを
第一の時定数であらかじめ定めた第一のレベルに
自動制御するレベル制御回路と、このレベル制御
回路から受けた入力信号に非線形歪を重畳した信
号を前記第一の時定数より小さい第二の時定数で
あらかじめ定めた第二のレベルに自動制御して出
力する歪発生回路と、この歪発生回路から受けた
入力信号を電力増幅し、この電力増幅時に発生を
する非直線歪を前記歪発生回路で重畳した非線形
歪により補償し、前記第二の時定数より小さい第
三の時定数であらかじめ定めた第三のレベルに自
動制御する電力増幅器とを備えて構成される。
The linearized power amplifier device of the present invention includes a level control circuit that automatically controls the output level to a predetermined first level using a first time constant, and a level control circuit that superimposes nonlinear distortion on the input signal received from the level control circuit. a distortion generation circuit that automatically controls and outputs a signal to a predetermined second level with a second time constant smaller than the first time constant; and a distortion generation circuit that power amplifies the input signal received from the distortion generation circuit; A power amplifier that compensates for nonlinear distortion generated during power amplification by the nonlinear distortion superimposed by the distortion generation circuit, and automatically controls it to a predetermined third level with a third time constant smaller than the second time constant. It is composed of:
以下実施例を示す図面を参照して本発明につい
て詳細に説明する。
The present invention will be described in detail below with reference to drawings showing embodiments.
第１図は、本発明の線形化電力増幅装置の一実
施例を示すブロツク図である。 FIG. 1 is a block diagram showing an embodiment of a linearized power amplifier according to the present invention.
第１図に示す実施例は、信号１１を入力し信号
１２を出力するドライバ増幅器１と、信号１２を
入力し信号１３を出力する歪発生回路２と、信号
１３を入力し信号１４を出力する電力増幅器３と
を備えて構成されている。 The embodiment shown in FIG. 1 includes a driver amplifier 1 which inputs a signal 11 and outputs a signal 12, a distortion generating circuit 2 which inputs a signal 12 and outputs a signal 13, and a distortion generating circuit 2 which inputs a signal 13 and outputs a signal 14. The power amplifier 3 is configured to include a power amplifier 3.
まず、第１図に示す実施例の定常状態における
動作について説明する。 First, the operation of the embodiment shown in FIG. 1 in a steady state will be explained.
ドライバ増幅器１は、信号１１を増幅し信号１
２として出力する。この際信号１２のレベルは、
ドライバ増幅器１の自動出力レベル制御動作によ
り、信号１１の振幅変動の最大周期より十分大き
い時定数T1でレベル制御され、平均値として一
定のレベルになつている。この平均レベルをドラ
イバ増幅器１の飽和出力レベルより十分低くして
信号１２中の非線形歪が無視できるようにする。 Driver amplifier 1 amplifies signal 11 and outputs signal 1
Output as 2. At this time, the level of signal 12 is
Due to the automatic output level control operation of the driver amplifier 1, the level is controlled with a time constant T1 that is sufficiently larger than the maximum period of the amplitude fluctuation of the signal 11, and the level is kept constant as an average value. This average level is made sufficiently lower than the saturation output level of driver amplifier 1 so that nonlinear distortion in signal 12 can be ignored.
歪発生回路２は、信号１２を増幅し、信号１２
の瞬時レベルに対応して所定の非直線歪を発生し
て、この非直線歪を含んだ信号を信号１３として
出力する。歪発生回路２の利得が変動して信号１
３の平均レベルが変動するのを防止するために、
歪発生回路２は自動出力レベル制御される。この
自動出力レベル制御の時定数T2を、信号１１の
振幅変動の最大周期よりは十分大きく、しかもド
ライバ増幅器１の自動出力レベル制御の時定数
T1よりは小さく設定する。信号１３の平均レベ
ルは、信号１３の瞬時レベルの最大値が電力増幅
器３の飽和入力レベル付近になり、しかもそれを
超えないようなレベルに設定される。 The distortion generation circuit 2 amplifies the signal 12 and
A predetermined nonlinear distortion is generated corresponding to the instantaneous level of , and a signal containing this nonlinear distortion is output as a signal 13. The gain of distortion generation circuit 2 fluctuates and the signal 1
In order to prevent the average level of 3 from fluctuating,
The distortion generating circuit 2 is subjected to automatic output level control. The time constant T 2 of this automatic output level control is set to be sufficiently larger than the maximum period of the amplitude fluctuation of the signal 11, and the time constant of the automatic output level control of the driver amplifier 1 is
Set smaller than T 1 . The average level of the signal 13 is set at such a level that the maximum instantaneous level of the signal 13 is near the saturation input level of the power amplifier 3, but does not exceed it.
電力増幅器３は、信号１３を増幅し信号１４と
して出力する。電力増幅器３が発生する非直線歪
は入力信号である信号１３中の非直線歪により打
消され、その結果、第１図に示す実施例は、電力
増幅器３の飽和レベル付近のレベルの信号を非直
線歪のない信号１４として出力する。信号１４の
平均レベルが変動しないように、電力増幅器３も
自動出力レベル制御される。この自動出力レベル
制御の時定数T3を、信号１１の振幅変動の最大
周期よりは十分大きく、しかも歪発生回路２の自
動出力レベル制御の時定数T2より小さく設定す
る。 Power amplifier 3 amplifies signal 13 and outputs it as signal 14. The nonlinear distortion generated by the power amplifier 3 is canceled by the nonlinear distortion in the input signal 13, and as a result, the embodiment shown in FIG. It is output as a signal 14 without linear distortion. The power amplifier 3 is also subjected to automatic output level control so that the average level of the signal 14 does not fluctuate. The time constant T 3 of this automatic output level control is set to be sufficiently larger than the maximum period of amplitude fluctuation of the signal 11 and smaller than the time constant T 2 of the automatic output level control of the distortion generating circuit 2.
次に、第１図に示す実施例の、信号１１の投入
時の過渡状態における動作について説明する。 Next, the operation of the embodiment shown in FIG. 1 in a transient state when the signal 11 is applied will be described.
第１図に示す実施例に信号１１が投入され、そ
のレベルが階段状に立上ると、ドライバ増幅器１
の利得が最小値から時定数T1で上昇し、信号１
２のレベルは、信号１１の投入時のレベルとドラ
イバ増幅器１の最小利得とで定まるレベルからド
ライバ増幅器１の自動出力レベル制御により定ま
るレベルまで時定数T1で立上る。 When the signal 11 is applied to the embodiment shown in FIG. 1 and its level rises in a stepwise manner, the driver amplifier 1
The gain of increases from the minimum value with a time constant T 1 , and the signal 1
The level of signal 2 rises with a time constant T 1 from a level determined by the level at the time of input of signal 11 and the minimum gain of driver amplifier 1 to a level determined by automatic output level control of driver amplifier 1.
歪発生回路２は、入力信号である信号１２の立
上りの時定数T1より小さい時定数T2で信号１２
の立上りに応動するので、信号１２の立上りの過
渡期においても動作レベルが狂つて歪発生動作が
正常でなくなるということはない。 The distortion generation circuit 2 generates the signal 12 with a time constant T 2 smaller than the time constant T 1 of the rise of the input signal 12.
Since the signal 12 responds to the rising edge of the signal 12, even during the transitional period of the rising edge of the signal 12, the operating level will not go out of order and the distortion generating operation will not become abnormal.
電力増幅器３は、入力信号である信号１３の立
上りの時定数T2より小さい時定数T3で信号１３
の立上りに応動するので、信号１２の立上りの過
渡期においても発生する非直線歪が信号１３中の
非直線歪により打消され、その結果非直線歪のな
い信号１４を出力する。 The power amplifier 3 outputs the signal 13 with a time constant T 3 smaller than the time constant T 2 of the rise of the input signal 13.
Since the non-linear distortion generated even during the transition period of the rising edge of the signal 12 is canceled by the non-linear distortion in the signal 13, a signal 14 without non-linear distortion is outputted.
以上説明したように第１図に示す実施例は、信
号１１を電力増幅器３の飽和出力レベル付近まで
非直線歪なく増幅し、しかも信号１１の投入時に
も異常な歪を発生することがない。 As described above, the embodiment shown in FIG. 1 amplifies the signal 11 to near the saturation output level of the power amplifier 3 without nonlinear distortion, and does not generate abnormal distortion even when the signal 11 is applied.
以上、実施例により本発明を説明したが、本発
明は、レベル制御回路が自動出力レベル制御され
た中間周波増幅器と送信周波数変換器とからなる
ような場合にも適用することができる。 Although the present invention has been described above with reference to embodiments, the present invention can also be applied to a case where the level control circuit includes an intermediate frequency amplifier and a transmission frequency converter whose output level is automatically controlled.
以上詳細に説明したように本発明の線形化電力
増幅装置は、歪発生回路の利得が変動し、その結
果電力増幅器の入力レベルが変動して歪発生回路
の歪補償動作が損われるのを防止するために歪発
生回路の出力レベルを自動制御する時定数を、歪
発生回路の入力レベルを制御するレベル制御回路
の自動出力レベル制御の時定数より小さくすると
いう手段を用いているので、信号の投入時にも歪
発生回路の動作レベルが狂つて歪発生動作が正常
でなくなり、異常な歪を出力するおそれがないと
いう効果がある。
As explained in detail above, the linearization power amplifier device of the present invention prevents the gain of the distortion generation circuit from changing, resulting in the input level of the power amplifier changing, and preventing the distortion compensation operation of the distortion generation circuit from being impaired. In order to achieve this, the time constant for automatically controlling the output level of the distortion generation circuit is made smaller than the time constant for automatic output level control of the level control circuit that controls the input level of the distortion generation circuit. There is an effect that there is no risk that the operating level of the distortion generating circuit will go out of order even when it is turned on, the distortion generating operation will no longer be normal, and that abnormal distortion will be output.
第１図は、本発明の線形化電力増幅装置の一実
施例を示すブロツク図である。
１……ドライバ増幅器、２……歪発生回路、３
……電力増幅器。
FIG. 1 is a block diagram showing an embodiment of a linearized power amplifier according to the present invention. 1...Driver amplifier, 2...Distortion generation circuit, 3
...Power amplifier.
Claims (1)
た第一のレベルに自動制御するレベル制御回路
と、このレベル制御回路から受けた入力信号に非
線形歪を重畳した信号を前記第一の時定数より小
さい第二の時定数であらかじめ定めた第二のレベ
ルに自動制御して出力する歪発生回路と、 この歪発生回路から受けた入力信号を電力増幅
し、この電力増幅時に発生をする非直線歪を前記
歪発生回路で重畳した非線形歪により補償し、前
記第二の時定数より小さい第三の時定数であらか
じめ定めた第三のレベルに自動制御する電力増幅
器と を備えることを特徴とする線形化電力増幅装置。[Claims] 1. A level control circuit that automatically controls the output level to a predetermined first level using a first time constant, and a signal obtained by superimposing nonlinear distortion on the input signal received from the level control circuit. A distortion generation circuit that automatically controls the output to a predetermined second level using a second time constant smaller than the first time constant, and amplifies the power of the input signal received from this distortion generation circuit. and a power amplifier that compensates for the generated nonlinear distortion with the nonlinear distortion superimposed by the distortion generation circuit, and automatically controls the generated nonlinear distortion to a predetermined third level with a third time constant smaller than the second time constant. A linearized power amplification device characterized by:
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP8741486A JPS62242403A (en) | 1986-04-15 | 1986-04-15 | Lineared power amplifier |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP8741486A JPS62242403A (en) | 1986-04-15 | 1986-04-15 | Lineared power amplifier |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS62242403A JPS62242403A (en) | 1987-10-23 |
| JPH0543204B2 true JPH0543204B2 (en) | 1993-07-01 |
Family
ID=13914216
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP8741486A Granted JPS62242403A (en) | 1986-04-15 | 1986-04-15 | Lineared power amplifier |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS62242403A (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5793253A (en) * | 1995-04-28 | 1998-08-11 | Unisys Corporation | High power solid state microwave transmitter |
-
1986
- 1986-04-15 JP JP8741486A patent/JPS62242403A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS62242403A (en) | 1987-10-23 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| EXPY | Cancellation because of completion of term |