JPH03227129A - Transmission output automatic control circuit - Google Patents

Transmission output automatic control circuit

Info

Publication number
JPH03227129A
JPH03227129A JP2123290A JP2123290A JPH03227129A JP H03227129 A JPH03227129 A JP H03227129A JP 2123290 A JP2123290 A JP 2123290A JP 2123290 A JP2123290 A JP 2123290A JP H03227129 A JPH03227129 A JP H03227129A
Authority
JP
Japan
Prior art keywords
power amplifier
phase
signal
output
transmission 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.)
Pending
Application number
JP2123290A
Other languages
Japanese (ja)
Inventor
Mayumi Takizawa
滝沢 真弓
Shogo Minami
南 省吾
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
NEC Corp
Original Assignee
NEC Corp
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by NEC Corp filed Critical NEC Corp
Priority to JP2123290A priority Critical patent/JPH03227129A/en
Publication of JPH03227129A publication Critical patent/JPH03227129A/en
Pending legal-status Critical Current

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  • Control Of Amplification And Gain Control (AREA)
  • Transmitters (AREA)

Abstract

PURPOSE:To adjust an output level of a synthesized transmission signal optionally by varying a phase of a signal of one power amplifier with a phase of a signal of the other power amplifier. CONSTITUTION:Level control of a transmission signal synthesized and outputted by a synthesizer 6 is implemented by varying a phase of an output signal of a power amplifier 4 with respect to a phase of an output signal of a power amplifier 5 by a phase shifter 3. Thus, when an output level after the synthesis of the two power amplifiers 4, 5 is increased or decreased, the phase of the output signal of the power amplifier 4 is shifted increasingly or decreasingly by the phase control of the phase shifter 3 so as to adjust the transmission output level. Thus, the transmission output level is controlled to be constant without addition of an ALC circuit respectively to the power amplifiers 4, 5.

Description

【発明の詳細な説明】 〔産業上の利用分野〕 本発明は2台のパワーアンプの出力を合成して送信出力
を得るマイクロ波帯無線通信装置に関し、特にその送信
出力を自動制御するための回路に関する。
[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a microwave band wireless communication device that obtains a transmission output by combining the outputs of two power amplifiers, and in particular, a method for automatically controlling the transmission output. Regarding circuits.

〔従来の技術〕[Conventional technology]

従来、送信出力を得るために2台のパワーアンプで構成
した無線通信装置が提案され、1台のパワーアンプが故
障したときにも他方のパワーアンプで最低限の送信出力
を確保するようにしている。
Conventionally, wireless communication devices configured with two power amplifiers have been proposed in order to obtain transmission output, and even if one power amplifier fails, the other power amplifier is designed to ensure the minimum transmission output. There is.

このような装置では、通常では2台のパワーアンプの出
力を合成して送信出力を得るように構成される。
Such devices are usually configured to combine the outputs of two power amplifiers to obtain a transmission output.

例えば、第3図に示すものは、入力端1に入力される送
信信号を分岐器2で2つに分岐し、夫々をパワーアンプ
4.5で増幅する。増幅された各信号は合成器6で合成
され、送信出力として出力端9から出力される。
For example, in the one shown in FIG. 3, a transmission signal input to an input terminal 1 is split into two by a splitter 2, and each is amplified by a power amplifier 4.5. The amplified signals are combined by a combiner 6 and outputted from an output terminal 9 as a transmission output.

ここで、各パワーアンプ4.5でそれぞれの出力レベル
を一定にするために、各パワーアンプ4゜5の出力一部
をカブラ10,11で取り出した上で、その出力レベル
を検波器12.13で検出し、この検出値に基づいてパ
ワーアンプ4.5の利得を制御する回路構成、即ち自動
利得制御回路(ALC回路)として構成している。
Here, in order to make the output level of each power amplifier 4.5 constant, a part of the output of each power amplifier 4.5 is taken out by couplers 10 and 11, and the output level is measured by detector 12.5. 13 and controls the gain of the power amplifier 4.5 based on this detected value, that is, it is configured as an automatic gain control circuit (ALC circuit).

〔発明が解決しようとする課題〕[Problem to be solved by the invention]

上述した従来の回路では、各パワーアンプ45の出力レ
ベルを一定にするために、各パワーアンプ4,5にそれ
ぞれALC回路を付設する必要があり、回路が複雑にな
るという問題がある。
In the conventional circuit described above, in order to make the output level of each power amplifier 45 constant, it is necessary to attach an ALC circuit to each power amplifier 4, 5, which causes a problem that the circuit becomes complicated.

また、各パワーアンプ4.5の出力レベルのみを制御す
るため、両出力に位相差が生じているような場合は、所
期の合成出力レベルを得ることができず、適正な制御が
難しいという問題もある。
In addition, since only the output level of each power amplifier 4.5 is controlled, if there is a phase difference between the two outputs, the desired combined output level cannot be obtained and proper control is difficult. There are also problems.

本発明の目的は、回路の簡略化を図るとともに、所期の
出力レベルを容易に得ることを可能にした送信出力自動
制御回路を提供することにある。
SUMMARY OF THE INVENTION An object of the present invention is to provide an automatic transmission output control circuit that has a simplified circuit and that makes it possible to easily obtain a desired output level.

〔課題を解決するための手段〕[Means to solve the problem]

本発明の自動制御回路は、2台のパワーアンプの一方に
移相器を接続し、合成された送信出力のレベルを検波器
で検出した上で、この送信出力レベルに基づいて移相器
により一方のパワーアンプにおける信号の位相を変化さ
せるように構成している。
The automatic control circuit of the present invention connects a phase shifter to one of two power amplifiers, detects the level of the combined transmission output with a wave detector, and then uses the phase shifter based on this transmission output level. The configuration is such that the phase of the signal in one power amplifier is changed.

〔作用〕[Effect]

本発明によれば、一方のパワーアンプにおける信号の位
相を他方のパワーアンプにおける信号の位相に対して変
化させることで、合成される送信信号の出力レベルを任
意に調整することが可能となる。
According to the present invention, by changing the phase of the signal in one power amplifier with respect to the phase of the signal in the other power amplifier, it is possible to arbitrarily adjust the output level of the transmitted signal to be combined.

〔実施例〕〔Example〕

次に、本発明を図面を参照して説明する。 Next, the present invention will be explained with reference to the drawings.

第1図は本発明の一実施例のブロック回路図である。図
において、1は送信信号が入力される入力端であり、入
力された送信信号はハイブリッドで構成される分岐器2
により2つに分岐される。
FIG. 1 is a block circuit diagram of one embodiment of the present invention. In the figure, 1 is an input terminal to which a transmission signal is input, and the input transmission signal is transmitted to a branching device 2 composed of a hybrid.
It is divided into two parts.

そして、各分岐路には夫々パワーアンプ4.5を配設し
、分岐された送信信号をそれぞれ増幅する。
A power amplifier 4.5 is disposed in each branch path to amplify the branched transmission signals, respectively.

ここで、一方の分岐路、ここではパワーアンプ4を配設
した分岐路には、パワーアンプ4の前段に移相器3を介
挿している。
Here, in one of the branch paths, in this case, the branch path in which the power amplifier 4 is disposed, a phase shifter 3 is inserted before the power amplifier 4.

前記各パワーアンプ4.5の出力は合成器6で合成され
、出力端9から送信信号として出力される。前記合成器
6の後段には送信信号の一部を取り出すためのカプラ8
を介挿し、かつこのカブラ8には取り出した信号のレベ
ルを検出するための検波器7を接続している。そして、
この検波器7の出力は前記移相器3に帰還させ、検出し
たレベル値に応じてパワーアンプ4で増幅される信号の
位相を制御するように構成している。
The outputs of the respective power amplifiers 4.5 are combined by a combiner 6 and outputted from an output terminal 9 as a transmission signal. A coupler 8 is provided after the combiner 6 for extracting a part of the transmitted signal.
is inserted, and a detector 7 is connected to this coupler 8 to detect the level of the extracted signal. and,
The output of the detector 7 is fed back to the phase shifter 3, and the phase of the signal amplified by the power amplifier 4 is controlled according to the detected level value.

この構成によれば、第2図(a)及び(b)にそれぞれ
パワーアンプ4,5の出力波形を示すように、パワーア
ンプ5の出力信号に対してパワーアンプ4の出力信号の
位相を移相器3により変化させることで、合成器6で合
成されて出力される送信信号のレベル制御を行うことが
できる。
According to this configuration, the phase of the output signal of the power amplifier 4 is shifted relative to the output signal of the power amplifier 5, as shown in FIGS. 2(a) and 2(b), which show the output waveforms of the power amplifiers 4 and 5, respectively. By changing the phase shifter 3, it is possible to control the level of the transmission signal that is synthesized and output by the synthesizer 6.

例えば、送信出力レベルの標準値を合成器6における最
大合成出力レベルより1dB程度低い値とし、この値に
なるようにパワーアンプ4の出力信号の位相を移相器3
で調整しておく。これにより、2台のパワーアンプ4.
5の合成後の出力レベルを上げる場合、または下げる場
合のいずれの場合でも、移相器3における位相制御によ
ってパワーアンプ4の出力信号の位相を前後に移動させ
、送信出力レベルを調整することが可能となる。
For example, the standard value of the transmission output level is set to a value approximately 1 dB lower than the maximum combined output level in the combiner 6, and the phase of the output signal of the power amplifier 4 is adjusted by the phase shifter 3 so that the standard value of the output signal of the power amplifier 4 becomes this value.
Adjust it with. This allows two power amplifiers 4.
In either case, when increasing or decreasing the output level after the synthesis of 5, the phase of the output signal of the power amplifier 4 can be shifted forward or backward by the phase control in the phase shifter 3, and the transmission output level can be adjusted. It becomes possible.

このため、この回路では各パワーアンプ4.5のそれぞ
れにALC回路を付設することなく送信出力レベルを一
定に制御することができ、回路の簡略化が可能となる。
Therefore, in this circuit, the transmission output level can be controlled to be constant without adding an ALC circuit to each power amplifier 4.5, and the circuit can be simplified.

また、送信信号の位相を制御することで、確実に所期の
出力レベルを得ることが可能となる。
Furthermore, by controlling the phase of the transmission signal, it is possible to reliably obtain the desired output level.

〔発明の効果] 以上説明したように本発明は、2台のパワーアンプの一
方に移相器を接続し、合成された送信出力のレベルに基
づいて移相器により一方のパワーアンプにおける信号の
位相を他方のパワーアンプにおける信号の位相に対して
変化させるので、2台のパワーアンプのそれぞれにAL
C回路を設けなくとも所期の出力レベルを容易に得るこ
とができ、回路の簡略化が実現できる。
[Effects of the Invention] As explained above, the present invention connects a phase shifter to one of two power amplifiers, and uses the phase shifter to adjust the signal in one power amplifier based on the level of the combined transmission output. Since the phase is changed relative to the phase of the signal in the other power amplifier, each of the two power amplifiers has an AL
A desired output level can be easily obtained without providing a C circuit, and the circuit can be simplified.

【図面の簡単な説明】[Brief explanation of drawings]

第1図は本発明の一実施例のブロック回路図、第2図(
a)及び(b)はそれぞれ第1図の2台のパワーアンプ
の出力波形図、第3図は従来の自動制御回路の一例を示
すブロック回路図である。 1・・・入力端、2・・・分岐器、3・・・移相器、4
゜パワーアンプ、6・・・合成器、7・・・検波器、8
ブ5,9・・・出力端、10.11・・・カブラ、12
.13・・・検波器。 5・・・ ・・・カ 第 図 第2 図
Figure 1 is a block circuit diagram of an embodiment of the present invention, Figure 2 (
FIG. 3 is a block circuit diagram showing an example of a conventional automatic control circuit. 1... Input end, 2... Brancher, 3... Phase shifter, 4
゜Power amplifier, 6...Synthesizer, 7...Detector, 8
Bu 5, 9... Output end, 10.11... Cobra, 12
.. 13...Detector. 5...... Figure 2

Claims (1)

【特許請求の範囲】[Claims] 1、入力された信号を2つに分岐し、分岐された各信号
を2台のパワーアンプで個別に増幅し、各パワーアンプ
の出力を合成して送信出力を得るようにした回路におい
て、前記パワーアンプの一方に接続した移相器と、合成
された送信出力のレベルを検出する検波器とを備え、こ
の検出された送信出力レベルに基づいて前記移相器によ
り一方のパワーアンプにおける信号の位相を変化させる
ように構成したことを特徴とする送信出力自動制御回路
1. In a circuit that branches an input signal into two, amplifies each branched signal individually with two power amplifiers, and synthesizes the output of each power amplifier to obtain a transmission output, as described above. It is equipped with a phase shifter connected to one side of the power amplifier and a detector that detects the level of the combined transmission output. A transmission output automatic control circuit characterized by being configured to change the phase.
JP2123290A 1990-01-31 1990-01-31 Transmission output automatic control circuit Pending JPH03227129A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP2123290A JPH03227129A (en) 1990-01-31 1990-01-31 Transmission output automatic control circuit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP2123290A JPH03227129A (en) 1990-01-31 1990-01-31 Transmission output automatic control circuit

Publications (1)

Publication Number Publication Date
JPH03227129A true JPH03227129A (en) 1991-10-08

Family

ID=12049290

Family Applications (1)

Application Number Title Priority Date Filing Date
JP2123290A Pending JPH03227129A (en) 1990-01-31 1990-01-31 Transmission output automatic control circuit

Country Status (1)

Country Link
JP (1) JPH03227129A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH05129804A (en) * 1991-10-30 1993-05-25 Mitsubishi Electric Corp Microwave switching circuit and high frequency amplifier

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH05129804A (en) * 1991-10-30 1993-05-25 Mitsubishi Electric Corp Microwave switching circuit and high frequency amplifier

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