JP2884578B2 - Power amplifier - Google Patents
Power amplifierInfo
- Publication number
- JP2884578B2 JP2884578B2 JP29997388A JP29997388A JP2884578B2 JP 2884578 B2 JP2884578 B2 JP 2884578B2 JP 29997388 A JP29997388 A JP 29997388A JP 29997388 A JP29997388 A JP 29997388A JP 2884578 B2 JP2884578 B2 JP 2884578B2
- Authority
- JP
- Japan
- Prior art keywords
- signal
- transmission
- amplifier
- power
- power 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.)
- Expired - Fee Related
Links
Landscapes
- Control Of Amplification And Gain Control (AREA)
- Cable Transmission Systems, Equalization Of Radio And Reduction Of Echo (AREA)
- Radio Relay Systems (AREA)
Description
【発明の詳細な説明】 ［産業上の利用分野］ 本発明は衛星通信地球局の送信電力の制御方式に関
し、特に送信機の入出力特性の非直線性から送信チャン
ネル数の増減により発生する送信機の利得変動を安定化
する手段に関する。Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a transmission power control system for a satellite communication earth station, and more particularly to a transmission system which is generated by increasing or decreasing the number of transmission channels due to non-linearity of input / output characteristics of a transmitter. The present invention relates to a means for stabilizing gain fluctuation of a machine.
［従来の技術およびその問題点］ 一般に送信機に用いられる電力増幅器は第２図に示す
通りの特性を有しており、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、直線性が劣化す
る。このような電力増幅器に複数チャンネルからの送信
信号を入力すると、このチャンネル数に応じて電力増幅
器の動作点が変動し、その結果電力増幅器の利得が変化
することになる。このような送信系利得の不安定な地球
局が複数同時に衛星中継器をアクセスした場合には衛星
中継器が飽和し回線品質の劣化が生ずるという問題点が
ある。[Prior art and its problems] Generally, a power amplifier used for a transmitter has characteristics as shown in FIG. 2, and as the input level increases, the output level corresponding thereto becomes more saturated and the linearity decreases. to degrade. When transmission signals from a plurality of channels are input to such a power amplifier, the operating point of the power amplifier fluctuates according to the number of channels, and as a result, the gain of the power amplifier changes. When a plurality of earth stations having unstable transmission system gains access to the satellite repeater at the same time, there is a problem that the satellite repeater is saturated and the line quality is deteriorated.
［問題点を解決するための手段］ 本発明の電力増幅装置は送信チャンネル数に応じて電
力増幅器の利得を一定に制御する機能を有する。[Means for Solving the Problems] The power amplifying device of the present invention has a function of controlling the gain of the power amplifier to be constant according to the number of transmission channels.
本願発明の要旨は、複数の送信信号入力端子に接続さ
れ複数のチャンネルを介して上記複数の送信入力端子に
選択的に供給される送信信号を合成し合成信号を発生す
る合成器と、上記合成信号の電力を増幅し送信信号を発
生する増幅器とを備えた電力増幅装置において、複数の
送信制御信号入力端子にそれぞれ接続される送信制御信
号が指定する使用チャンネルの数に応じたディジタルレ
ベル信号を発生する読み出し専用メモリと、上記ディジ
タルレベル信号をアナログレベル信号に変換する変換器
と、上記アナログレベル信号を波形整形し利得制御信号
とするフィルタとをさらに有し、上記増幅器は上記利得
制御信号に応答し上記合成信号の電力増幅する利得制御
用増幅器と、該利得制御用増幅器の出力信号を一定利得
で増幅し上記送信信号を発生する電力増幅器とを有する
ことである。The gist of the present invention is that a combiner that is connected to a plurality of transmission signal input terminals and selectively combines transmission signals supplied to the plurality of transmission input terminals via a plurality of channels to generate a combined signal; A power amplifier comprising an amplifier for amplifying signal power and generating a transmission signal, wherein a digital level signal corresponding to the number of used channels specified by the transmission control signals respectively connected to the plurality of transmission control signal input terminals is provided. A read-only memory to be generated, a converter for converting the digital level signal to an analog level signal, and a filter for shaping the waveform of the analog level signal to be used as a gain control signal, wherein the amplifier is adapted to output the gain control signal. A gain control amplifier that responds and amplifies the power of the composite signal; and amplifies the output signal of the gain control amplifier with a constant gain to generate the transmission signal. It is to have a power amplifier for generating.
［実施例］ 次に本発明の実施例について図面を参照して説明す
る。[Example] Next, an example of the present invention will be described with reference to the drawings.
第１図は本発明の一実施例を示すブロック図である。
送信信号入力端子11,12,13〜1Nから入力されたＮ個の送
信信号は、入力数Ｎの合成器２で電力合成される。この
合成信号は利得制御用増幅器３を介して電力増幅器４に
入力され、電力増幅される。電力増幅された送信信号は
送信出力端子５から送信信号として出力される。一方送
信制御信号入力端子61,62,63〜6Nから入力される送信制
御信号は例えば送信時「１」、非送信時「０」となる状
態信号であり、使用チャンネル数を判定するためのもの
である。これらの送信制御信号が入力されるROM7は使用
チャンネル数に応じて利得制御のレベル信号を発生する
ためのROMテーブルになっている。FIG. 1 is a block diagram showing one embodiment of the present invention.
The N transmission signals input from the transmission signal input terminals 11, 12, 13 to 1N are power-combined by the number N of combiners 2. This synthesized signal is input to the power amplifier 4 via the gain control amplifier 3 and is power-amplified. The power-amplified transmission signal is output from the transmission output terminal 5 as a transmission signal. On the other hand, the transmission control signal input from the transmission control signal input terminals 61, 62, 63 to 6N is, for example, a state signal that becomes "1" at the time of transmission and "0" at the time of non-transmission, and is used to determine the number of used channels. It is. The ROM 7 to which these transmission control signals are input is a ROM table for generating a gain control level signal according to the number of channels used.
D/A変換器８及びフィルタ９はこのROM8から出力され
るビット情報をアナログ信号に変換し、利得制御用増幅
器３に利得制御信号として供給される。The D / A converter 8 and the filter 9 convert the bit information output from the ROM 8 into an analog signal, and are supplied to the gain control amplifier 3 as a gain control signal.
利得制御用増幅器３に入力される利得制御信号は第２
図及び第１表に示す通りに設定される。第２図は電力増
幅器４の入出力特性で送信チャンネル数に応じて動作点
が移動するために、利得が変化することを示している。The gain control signal input to the gain control amplifier 3 is the second
It is set as shown in the figure and Table 1. FIG. 2 shows that the gain changes because the operating point moves according to the number of transmission channels in the input / output characteristics of the power amplifier 4.
第１表は送信チャンネル数が１から６まで変化した場
合について電力増幅器４の利得と利得制御用増幅器３の
利得の関係を示している。Table 1 shows the relationship between the gain of the power amplifier 4 and the gain of the gain control amplifier 3 when the number of transmission channels changes from 1 to 6.
送信チャンネル数が１に相当する入力信号を加えた場
合の電力増幅器４の利得をＧ−ｇ＋ΔG1として、この電
力増幅器４の前段の利得制御用増幅器３の利得がｇ−Δ
G1になるようにROM7に利得制御情報を書き込むと、この
電力増幅装置の総利得はＧとなる。Assuming that the gain of the power amplifier 4 when an input signal corresponding to one transmission channel is added is G−g + ΔG1, the gain of the gain control amplifier 3 preceding the power amplifier 4 is g−Δ
When the gain control information is written into the ROM 7 so as to be G1, the total gain of the power amplifying device becomes G.
他の送信チャンネル数についても同様の考え方に基づ
いて電力増幅装置の総利得をＧにすることが可能とな
り、結果として送信チャンネル数に無関係に一定利得の
電力増幅装置が構成できる。The total gain of the power amplifying device can be set to G based on the same concept for other numbers of transmission channels, and as a result, a power amplifying device having a constant gain can be configured regardless of the number of transmission channels.
［発明の効果］ 以上説明したように本発明は、送信チャンネル数に応
じて電力増幅器に入力される入力信号レベルを制御する
ことにより、等価的に電力増幅装置の総利得を一定に
し、結果として衛星中継器の入力レベルを安定化するこ
とが可能となる。 [Effects of the Invention] As described above, the present invention controls the input signal level input to the power amplifier in accordance with the number of transmission channels, thereby equivalently making the total gain of the power amplifying device constant, and as a result The input level of the satellite repeater can be stabilized.
特に、大きな出力電力を有する電力増幅器の直線性が
劣化するために、本発明による電力増幅装置の利得安定
化手段は有効である。In particular, since the linearity of a power amplifier having a large output power deteriorates, the gain stabilizing means of the power amplifier according to the present invention is effective.
第１図は本発明の電力増幅装置の系統を示すブロック
図、第２図は電力増幅器４の入出力特性を示すグラフで
ある。 11,12,13〜1N……送信信号入力端子（チャンネル1,2,3
〜Ｎ）、２……合成器、３……利得制御用増幅器、４…
…電力増幅器、５……送信信号出力端子、61,62,63〜6N
……送信制御信号入力端子（チャンネル1,2,3〜Ｎ）、
７……ROM（Read Only Memory、書込専用メモリ）、８
……D/A変換器（Digital−Analog、変換器）、９……フ
ィルタ。FIG. 1 is a block diagram showing a system of the power amplifier of the present invention, and FIG. 2 is a graph showing input / output characteristics of the power amplifier 4. 11,12,13 ~ 1N …… Transmission signal input terminals (channels 1,2,3
... N), 2 ... combiner, 3 ... gain control amplifier, 4 ...
... Power amplifier, 5 ... Transmission signal output terminal, 61,62,63-6N
...... Transmission control signal input terminals (channels 1, 2, 3 to N)
7 ROM (Read Only Memory), 8
... D / A converter (Digital-Analog, converter), 9 ... Filter.
Claims (1)
チャンネルを介して上記複数の送信入力端子に選択的に
供給される送信信号を合成し合成信号を発生する合成器
と、上記合成信号の電力を増幅し送信信号を発生する増
幅器とを備えた電力増幅装置において、 複数の送信制御信号入力端子にそれぞれ接続される送信
制御信号が指定する使用チャンネルの数に応じたディジ
タルレベル信号を発生する読み出し専用メモリと、上記
ディジタルレベル信号をアナログレベル信号に変換する
変換器と、上記アナログレベル信号を波形整形し利得制
御信号とするフィルタとをさらに有し、 上記増幅器は上記利得制御信号に応答し上記合成信号の
電力増幅する利得制御用増幅器と、該利得制御用増幅器
の出力信号を一定利得で増幅し上記送信信号を発生する
電力増幅器とを有することを特徴とする電力増幅装置。A synthesizer for combining a transmission signal connected to a plurality of transmission signal input terminals and selectively supplied to the plurality of transmission input terminals via a plurality of channels to generate a combined signal; Power amplifier comprising an amplifier for amplifying the power of the transmission control signal and generating a transmission signal, generating a digital level signal corresponding to the number of used channels specified by the transmission control signal connected to each of the plurality of transmission control signal input terminals. A read-only memory, a converter for converting the digital level signal to an analog level signal, and a filter for shaping the waveform of the analog level signal to obtain a gain control signal, wherein the amplifier responds to the gain control signal. And a gain control amplifier for amplifying the power of the synthesized signal, and amplifying the output signal of the gain control amplifier with a constant gain and transmitting the transmission signal. Power amplifier apparatus characterized by having a power amplifier for live.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP29997388A JP2884578B2 (en) | 1988-11-28 | 1988-11-28 | Power amplifier |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP29997388A JP2884578B2 (en) | 1988-11-28 | 1988-11-28 | Power amplifier |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH02145028A JPH02145028A (en) | 1990-06-04 |
| JP2884578B2 true JP2884578B2 (en) | 1999-04-19 |
Family
ID=17879211
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP29997388A Expired - Fee Related JP2884578B2 (en) | 1988-11-28 | 1988-11-28 | Power amplifier |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2884578B2 (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP3958066B2 (en) * | 2002-02-21 | 2007-08-15 | ソニー・エリクソン・モバイルコミュニケーションズ株式会社 | Transmission output circuit and mobile communication terminal |
-
1988
- 1988-11-28 JP JP29997388A patent/JP2884578B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JPH02145028A (en) | 1990-06-04 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| LAPS | Cancellation because of no payment of annual fees |