JPH0691388B2 - Power amplifier - Google Patents
Power amplifierInfo
- Publication number
- JPH0691388B2 JPH0691388B2 JP21187588A JP21187588A JPH0691388B2 JP H0691388 B2 JPH0691388 B2 JP H0691388B2 JP 21187588 A JP21187588 A JP 21187588A JP 21187588 A JP21187588 A JP 21187588A JP H0691388 B2 JPH0691388 B2 JP H0691388B2
- Authority
- JP
- Japan
- Prior art keywords
- power amplifier
- gain
- transmission
- input
- output
- 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 - Fee Related
Links
Landscapes
- Control Of Amplification And Gain Control (AREA)
- Radio Relay Systems (AREA)
Description
【発明の詳細な説明】 〔産業上の利用分野〕 本発明は電力増幅装置に関し、特に衛星通信の地球局で
送信信号の電力増幅を行う電力増幅装置に関する。TECHNICAL FIELD The present invention relates to a power amplifier, and more particularly to a power amplifier for amplifying the power of a transmission signal in an earth station for satellite communication.
衛星通信の各地球局は、それぞれ独自に衛星中継局と複
数アクセスしている。Each earth station for satellite communications has unique access to multiple satellite relay stations.
一般に、送信機に用いられる電力増幅器は、入力レベル
が大きくなるほどこれに対応した出力レベルが飽和して
直線性が劣化する。In general, in a power amplifier used in a transmitter, as the input level increases, the output level corresponding to this becomes saturated and the linearity deteriorates.
このような電力増幅器に複数チャネルの送信信号を入力
すると、使用チャネル数に応じて電力増幅器の動作点，
つまり入力電力が変化し、その結果電力増幅器の利得お
よび各チャネルごとの出力電力が変化することになる。When the transmission signals of multiple channels are input to such a power amplifier, the operating point of the power amplifier depends on the number of channels used.
That is, the input power changes, and as a result, the gain of the power amplifier and the output power of each channel change.
従って、上述の電力増幅器を用いる複数の地球局から同
時に衛星中継器をアクセスした場合には、使用チャネル
数によって衛星中継器への各チャネルの入力電力が変化
するので、S/N比の劣化や衛星中継器の飽和による相互
ひずみ雑音の増加を生じ、回線品質の劣化が生ずるとい
う問題がある。Therefore, when the satellite repeater is simultaneously accessed from a plurality of earth stations using the above power amplifier, the input power of each channel to the satellite repeater changes depending on the number of channels used, which causes deterioration of the S / N ratio. There is a problem that the mutual distortion noise increases due to the saturation of the satellite repeater and the line quality deteriorates.
本発明の電力増幅装置は、Ｎ個の送信信号入力の各各に
対する利得制御を利得設定信号に基づいてそれぞれ行う
Ｎ個の利得制御用増幅器と、前記Ｎ個の利得制御用増幅
器の出力を合成する合成器と、前記合成器の出力に所定
の固定減衰量を付与する固定減衰器と、前記固定減衰器
の出力を電力増幅する電力増幅器と、前記Ｎ個の送信信
号入力のうち実際に送信を行う送信信号入力数と前記電
力増幅器の入出力特性とに対応して予め定めた前記利得
設定信号を出力する制御回路とを備えて構成される。The power amplification device of the present invention combines N gain control amplifiers that perform gain control for each of the N transmission signal inputs based on the gain setting signal with the outputs of the N gain control amplifiers. Synthesizer, a fixed attenuator that gives a predetermined fixed amount of attenuation to the output of the synthesizer, a power amplifier that power-amplifies the output of the fixed attenuator, and the actual transmission of the N transmission signal inputs. And a control circuit for outputting the gain setting signal determined in advance corresponding to the number of input transmission signals and the input / output characteristics of the power amplifier.
次に、本発明について図面を参照して説明する。 Next, the present invention will be described with reference to the drawings.
第１図は本発明の一実施例の構成図である。FIG. 1 is a block diagram of an embodiment of the present invention.
この電力増幅装置は、端子11−１〜11−Ｎを介して入力
するチャネル１−ＮのＮ個の送信信号の利得制御を行う
Ｎ個の利得制御用増幅器１−１〜１−Ｎ、Ｎ個の利得制
御用増幅器１−１〜１−Ｎの出力を合成する合成器３、
合成器３の出力に所定の固定減衰量を付与する固定減衰
器４、固定減衰器４の出力を電力増幅する電力増幅器
５、端子12−１〜12−Ｎを介して入力するチャネル１〜
ＮのＮ個の送信信号入力のうち実際に送信を行う送信信
号数と電力増幅器５の入出力特性とに対応してＮ個の利
得制御用増幅器１−１〜１−Ｎの利得を制御する利得設
定信号を出力する制御回路２を備えて構成される。This power amplification device includes N gain control amplifiers 1-1 to 1-N, N for performing gain control of N transmission signals of channels 1-N input through terminals 11-1 to 11-N. A combiner 3 for combining the outputs of the individual gain control amplifiers 1-1 to 1-N,
A fixed attenuator 4 for giving a predetermined fixed amount of attenuation to the output of the combiner 3, a power amplifier 5 for power-amplifying the output of the fixed attenuator 4, and channels 1 to 1 input via terminals 12-1 to 12-N.
The gains of the N gain control amplifiers 1-1 to 1-N are controlled according to the number of transmission signals to be actually transmitted among the N transmission signal inputs of N and the input / output characteristics of the power amplifier 5. It is configured to include a control circuit 2 that outputs a gain setting signal.
端子11−１〜11−Ｎから入力されたＮ個の送信信号入力
は、利得制御用増幅器１−１〜１−Ｎ、入力数Ｎの合成
器３、固定減衰器４を経て電力増幅器５に入力され、送
信信号出力端子６から送信信号として出力される。The N transmission signal inputs input from the terminals 11-1 to 11-N are fed to the power amplifier 5 via the gain control amplifiers 1-1 to 1-N, the combiner 3 having the number N of inputs, and the fixed attenuator 4. It is input and is output as a transmission signal from the transmission signal output terminal 6.
一方、チャネル１〜Ｎの送信制御入力が端子12−１〜12
−Ｎを介して制御回路２に供給される。この送信制御入
力は、送信信号入力11−１〜11−Ｎが利得制御用増幅器
１−１〜１−Ｎに実際に入力しているか否かをそれぞれ
“1"および“0"で示す情報である。つまり、送信制御入
力が“1"の場合には、このチャネルの送信信号が送信信
号出力端子６から送信されている。On the other hand, the transmission control inputs of channels 1 to N are connected to terminals 12-1 to 12
It is supplied to the control circuit 2 via −N. This transmission control input is information indicating whether or not the transmission signal inputs 11-1 to 11-N are actually input to the gain control amplifiers 1-1 to 1-N by "1" and "0", respectively. is there. That is, when the transmission control input is “1”, the transmission signal of this channel is transmitted from the transmission signal output terminal 6.
制御回路２はROM8,D−Ａ変換器９およびフィルタ10を備
えて構成される。ROM8は、Ｎ個の送信制御入力の“1",
“0"を判断して使用チャネル数を知り、この使用チャネ
ル数と電力増幅器５の入出力特性とに対応して予め設定
してある利得設定信号を出力する。この利得設定信号
が、Ｄ−Ａ変換器９でアナログ化されたのちフィルタ10
を通して利得制御用増幅器１−１〜１−Ｎに供給され
る。The control circuit 2 comprises a ROM 8, a DA converter 9 and a filter 10. ROM8 has N transmission control inputs of "1",
By determining "0", the number of used channels is known, and a gain setting signal set in advance corresponding to the number of used channels and the input / output characteristics of the power amplifier 5 is output. This gain setting signal is converted into an analog signal by the DA converter 9 and then the filter 10
Through the gain control amplifiers 1-1 to 1-N.
第２図は、第１図の実施例の電力増幅器５の入出力特性
図である。FIG. 2 is an input / output characteristic diagram of the power amplifier 5 of the embodiment shown in FIG.
この図は、送信チャネル数が増加して入力レベル（入力
電力）が増大すると、電力増幅器５は、出力レベル（出
力電力）の飽和傾向を示し、利得が低下することを示し
ている。送信チャネル数が１のときの電力増幅器５の利
得はＧ＋ΔG1（dB）である。また、送信チャネル数６の
ときの電力増幅器５の利得は、Ｇ＋ΔG6（dB）となり、
送信チャネル数１のときより（ΔG1−ΔG6）（dB）だけ
低くなる。つまり、送信チャネル数６のときの電力増幅
器５の出力端における各チャネルの出力は、送信チャネ
ル数１のときより（ΔG1−ΔG6）（dB）だけ低くなる。
なお、Ｇ（dB）は後述するとおりこの電力増幅装置全体
の総利得を表わし、ΔG1〜ΔG6（dB）は電力増幅器５の
入力レベルの変化によるＧ（dB）からの利得変動分を表
わしている 第３図は、第１図の実施例の送信チャネル数１〜６に対
応する電力増幅器５の利得ならびに利得制御用増幅器１
−１〜１−Ｎの設定利得ならびに固定減衰器４の付与減
衰量（−ｇ）（dB）およびこれらの値を与えたときの電
力増幅装置の総利得を示す図である。This figure shows that when the number of transmission channels increases and the input level (input power) increases, the power amplifier 5 shows a saturation tendency of the output level (output power) and the gain decreases. The gain of the power amplifier 5 when the number of transmission channels is 1 is G + ΔG1 (dB). Further, the gain of the power amplifier 5 when the number of transmission channels is 6 is G + ΔG6 (dB),
It becomes (ΔG1-ΔG6) (dB) lower than when the number of transmission channels is 1. That is, the output of each channel at the output end of the power amplifier 5 when the number of transmission channels is 6 is lower by (ΔG1−ΔG6) (dB) than when the number of transmission channels is 1.
As will be described later, G (dB) represents the total gain of the entire power amplification device, and ΔG1 to ΔG6 (dB) represents the gain variation from G (dB) due to the change in the input level of the power amplifier 5. FIG. 3 shows the gain of the power amplifier 5 and the gain control amplifier 1 corresponding to the number of transmission channels 1 to 6 in the embodiment of FIG.
It is a figure which shows the setting gain of -1 to 1-N, the amount of attenuation (-g) (dB) of the fixed attenuator 4, and the total gain of the power amplification device when these values are given.
送信チャネル数１に相当する入力信号を加えた場合の電
力増幅器５の利得をＧ＋ΔG1（dB）として、この電力増
幅器５前段の利得制御用増幅器１−１〜１−Ｎの利得
が、ｇ−ΔG1（dB）になるようにROM8に利得制御情報を
予め書き込んでおくと、所定の固定減衰量，この場合は
固定減衰量ｇの固定減衰器４をそう入することにより本
実施例の電力増幅装置の総利得がＧ（aB）となる。他の
送信チャネル数の場合にも、同様の考え方に基づいてRO
M8に利得制御情報を書き込んでおくことによりこの電力
増幅装置の総利得がＧ（dB）になり、つまり各チャネル
の総利得も送信チャネル数に無関係に一定の利得Ｇ（d
B）となる。従って、送信信号出力端子６から送信され
る各チャネルの送信信号のレベルは、送信チャネル数と
は無関係に一定となる。Letting G + ΔG1 (dB) be the gain of the power amplifier 5 when an input signal corresponding to the number of transmission channels 1 is added, the gains of the gain control amplifiers 1-1 to 1-N in the preceding stage of the power amplifier 5 are g−ΔG1. If gain control information is written in advance in the ROM 8 so as to be (dB), the fixed attenuator 4 having a predetermined fixed attenuation amount, in this case, the fixed attenuation amount g is inserted so that the power amplifying apparatus of the present embodiment. The total gain of is G (aB). For other numbers of transmission channels, RO
By writing gain control information in M8, the total gain of this power amplification device becomes G (dB), that is, the total gain of each channel is a constant gain G (d
B). Therefore, the level of the transmission signal of each channel transmitted from the transmission signal output terminal 6 becomes constant regardless of the number of transmission channels.
以上説明したように本発明の電力増幅装置は、実際に送
信を行う送信信号入力数と電力増幅器の入出力特性とに
対応する利得設定信号によってＮ個の利得制御用増幅器
の利得制御を行うので、送信チャネル数が変化しても総
利得および各チャネルの出力レベルを一定に保つことが
できるという効果がある。As described above, the power amplification device of the present invention performs gain control of N gain control amplifiers by the gain setting signals corresponding to the number of transmission signal inputs for actual transmission and the input / output characteristics of the power amplifier. Even if the number of transmission channels changes, the total gain and the output level of each channel can be kept constant.
この結果、地球局にこの発明の電力増幅装置を用いる
と、衛星中継器に入力されるチャネル数が変化しても、
各チャネルの入力レベルを規格内に安定化できるという
効果を生ずる。この効果は、電源効率を大きくするため
に直線性劣化の生じ勝な大電力の電力増幅器を用いる装
置において特に必要性が高い。As a result, when the power amplification device of the present invention is used for the earth station, even if the number of channels input to the satellite repeater changes,
The effect is that the input level of each channel can be stabilized within the standard. This effect is particularly necessary in a device that uses a high-power power amplifier that is liable to cause linearity deterioration in order to increase power supply efficiency.
第１図は本発明の一実施例による電力増幅装置の構成
図、第２図は第１図の実施例の電力増幅器５の入出力特
性図、第３図は第１図の実施例の送信チャネル数に対応
する電力増幅器５の利得ならびに利得制御用増幅器１−
１〜１−Ｎの設定利得ならびに固定減衰器４の付与減衰
量およびこれらの値を与えたときの電力増幅装置の総利
得を示す図である。 １−１〜１−Ｎ……利得制御用増幅器、２……制御回
路、３……合成器、４……固定減衰器、５……電力増幅
器、８……ROM、９……Ｄ−Ａ変換器、10……フィル
タ。1 is a block diagram of a power amplifier device according to an embodiment of the present invention, FIG. 2 is an input / output characteristic diagram of a power amplifier 5 of the embodiment of FIG. 1, and FIG. 3 is a transmission of the embodiment of FIG. The gain of the power amplifier 5 corresponding to the number of channels and the gain control amplifier 1-
It is a figure which shows the set gain of 1-1-N, the amount of attenuation given to the fixed attenuator 4, and the total gain of the power amplification device when these values are given. 1-1 to 1-N ... Gain control amplifier, 2 ... Control circuit, 3 ... Combiner, 4 ... Fixed attenuator, 5 ... Power amplifier, 8 ... ROM, 9 ... DA Converter, 10 ... filter.
Claims (1)
御を利得設定信号に基づいてそれぞれ行うＮ個の利得制
御用増幅器と、前記Ｎ個の利得制御用増幅器の出力を合
成する合成器と、前記合成器の出力に所定の固定減衰量
を付与する固定減衰器と、前記固定減衰器の出力を電力
増幅する電力増幅器と、前記Ｎ個の送信信号入力のうち
実際に送信を行う送信信号入力数と前記電力増幅器の入
出力特性とに対応して予め定めた前記利得設定信号を出
力する制御回路とを備えて成ることを特徴とする電力増
幅装置。1. An N gain control amplifier for performing gain control for each of N transmission signal inputs based on a gain setting signal, and a combiner for synthesizing outputs of the N gain control amplifiers. A fixed attenuator for giving a predetermined fixed attenuation amount to the output of the combiner, a power amplifier for power amplifying the output of the fixed attenuator, and a transmission for actually transmitting the N transmission signal inputs. A power amplifier comprising: a control circuit that outputs the gain setting signal determined in advance corresponding to the number of signal inputs and the input / output characteristics of the power amplifier.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP21187588A JPH0691388B2 (en) | 1988-08-25 | 1988-08-25 | Power amplifier |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP21187588A JPH0691388B2 (en) | 1988-08-25 | 1988-08-25 | Power amplifier |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0260216A JPH0260216A (en) | 1990-02-28 |
| JPH0691388B2 true JPH0691388B2 (en) | 1994-11-14 |
Family
ID=16613065
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP21187588A Expired - Fee Related JPH0691388B2 (en) | 1988-08-25 | 1988-08-25 | Power amplifier |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0691388B2 (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104874139A (en) * | 2015-06-23 | 2015-09-02 | 国家电网公司 | Folding length-adjustable safety rope |
-
1988
- 1988-08-25 JP JP21187588A patent/JPH0691388B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0260216A (en) | 1990-02-28 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| LAPS | Cancellation because of no payment of annual fees |