JPS61131918A - Transmission output control circuit - Google Patents

Transmission output control circuit

Info

Publication number
JPS61131918A
JPS61131918A JP25360384A JP25360384A JPS61131918A JP S61131918 A JPS61131918 A JP S61131918A JP 25360384 A JP25360384 A JP 25360384A JP 25360384 A JP25360384 A JP 25360384A JP S61131918 A JPS61131918 A JP S61131918A
Authority
JP
Japan
Prior art keywords
output
voltage
controller
transmission
controlled attenuator
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
JP25360384A
Other languages
Japanese (ja)
Inventor
Shigeru Yokosuka
横須加　茂
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 JP25360384A priority Critical patent/JPS61131918A/en
Publication of JPS61131918A publication Critical patent/JPS61131918A/en
Pending legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
    • H04B1/02—Transmitters
    • H04B1/04—Circuits
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
    • H04B1/02—Transmitters
    • H04B1/04—Circuits
    • H04B2001/0408—Circuits with power amplifiers
    • H04B2001/0416—Circuits with power amplifiers having gain or transmission power control

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Transmitters (AREA)

Abstract

PURPOSE:To attain stable output control by using a designation signal of a transmission output so as to control a voltage controlled attenuator and an amplifier thereby making a negative feedback quantity constant independently of the transmission output. CONSTITUTION:A control signal bringing the transmission output to the rated output is fed to voltage controllers 13, 14 via a controller 8. A control voltage being a level difference between the normal output and the minimum output is given from the controller 13 to the voltage controlled attenuator 12, a normal power supply voltage is given from the controller 14 to a power amplifier 3, an output subtracted by an attenuation is detected (6), compared and amplified (10) with an output of a reference voltage generator 7, and it is fed back negatively to a voltage controlled attenuator 21 as an error voltage. Thus, the transmission output at an output terminal 5 is kept constant. In minimizing the transmission output, a control signal designating the output to the minimum value is fed from the controller 8, and in bringing the attenuation of the attenuator 21 to the attenuation equal to that at the rated output, the transmission power is kept to the minimum value and the output of the detector 6 is made nearly equal for both the rated output and the minimum output.

Description

【発明の詳細な説明】 （産業上の利用分野） 本発明は、移動無線機に使用される送信機の出力制御回
路に関する。DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to an output control circuit for a transmitter used in a mobile radio device.

（従来の技術） 自動車電話システムにおいては日清にシステムを運用す
るため、移動無線機を備えた移動端末局はシステムの無
線ゾーンの大きさに応じて移動無線機の送信出力を最適
な値に設定し、他のゾーンへのオーパリ〜チや基地局で
の過大入力による混変調等の妨害を除く必要があった。(Prior art) In the car telephone system, since the system is operated by Nissin, a mobile terminal station equipped with a mobile radio sets the transmission power of the mobile radio to an optimal value according to the size of the wireless zone of the system. It was necessary to set this and eliminate interference such as over-reach to other zones and cross-modulation caused by excessive input at the base station.

このため、移動無線機の送信出力は多段階にわたって可
変できる機能が要求されてき念。For this reason, there is a strong demand for a function that allows the transmission output of mobile radio equipment to be varied over multiple stages.

従来の斯かる送信出力制御回路の代表例を第３図に示す
。第３図において、１は送信信号入力端子、２は電圧制
御減衰器、３は電力増幅器、４は方向性結合器、５は送
信信号出力端子、６は検波器、７は基準電圧発生器、８
は制御器、９は制御信号入力端子である。A typical example of such a conventional transmission output control circuit is shown in FIG. In FIG. 3, 1 is a transmission signal input terminal, 2 is a voltage controlled attenuator, 3 is a power amplifier, 4 is a directional coupler, 5 is a transmission signal output terminal, 6 is a wave detector, 7 is a reference voltage generator, 8
is a controller, and 9 is a control signal input terminal.

第３図において、送信信号入力端子１より入力された送
信信号は電圧制御減衰器２により、あらかじめ定められ
た減衰量だけ減衰させられ念後、電力増幅器３で電力増
幅され、送信信号出力端子５に出力される。いっぽう、
電力増幅器３の出力信号の一部は方向性結合器４により
取出され、ダイオード検波器６により直流電圧に変換さ
れる。また、制御信号入力端子９より送信出力を指定す
る制御信号が制御器８に入力されると、制御器８によジ
基準電圧発生器７は送信出力の規定値に対応した基準電
圧を出力する。この基準電圧と上記ダイオード検波器６
よりの直流電圧とが比較増幅器ｌＯに加えられ、比較増
幅１％ｌｏから誤差電圧から出力される。この誤差電圧
が電圧制例器１１に入力されると、電圧制御器１１の出
力電圧は電圧制御減衰器２０制御電圧として負帰還され
、電力増幅器３の出力が規定値になるように制御される
。ここで、出力の規定値は、上記出力を指定する制御信
号によって基準電圧発生器の出力電圧を変えて設定され
る。In FIG. 3, a transmission signal inputted from a transmission signal input terminal 1 is attenuated by a predetermined attenuation amount by a voltage control attenuator 2, and then power amplified by a power amplifier 3, and the transmission signal is output from a transmission signal output terminal 5. is output to. On the other hand,
A part of the output signal of the power amplifier 3 is extracted by a directional coupler 4 and converted into a DC voltage by a diode detector 6. Further, when a control signal specifying the transmission output is input to the controller 8 from the control signal input terminal 9, the reference voltage generator 7 outputs a reference voltage corresponding to the specified value of the transmission output. . This reference voltage and the diode detector 6
A DC voltage of 1% is applied to the comparator amplifier lO, and an error voltage is output from the comparator amplifier 1%lo. When this error voltage is input to the voltage regulator 11, the output voltage of the voltage controller 11 is negatively fed back as a control voltage of the voltage control attenuator 20, and the output of the power amplifier 3 is controlled to a specified value. . Here, the prescribed value of the output is set by changing the output voltage of the reference voltage generator in accordance with the control signal specifying the output.

（発明が解決しようとする問題点） このように、基準′α圧を変化させて送信出力を変化さ
せる従来の送信出力の制御器８では送信出力の可変範囲
が小さくて数ｄＢ糧変の範囲ではあｉ９問題がないが、
送信出力を多段階に可変する必要性がある無線機では以
下に説明するような欠点がある。すなわち、最近の自動
車電話システムにかいては送信出力の可変範囲が非常に
大きく、約３０ｄＢにも及んでいるので、従来の回路方
式で斯かる仕様を満足させるためには、検波器６のダイ
ナミックレンジヲ広くする必要が島る。しかし、移動無
線機の′１源として自動車のバッテリを使用している関
係で、一般には定格出力の時でも検波出力電圧は最大は
ソ１０ｖとなる。いっぽう、出力が最低値に設定されて
いる場合には、数百ｍＶの非常に小さな電圧となり、外
来雑音や電源電圧変動、あるいは温度変化に影響されて
送信出力を安定に規定値に保つのは困蝿になる。また、
検波器６の出力電圧の変化幅が大きくなると電圧制御減
衰器２への帰還量も大きく変化するため、電力増幅器３
０入カレベルの変化が大きくなる。しかしながら、電力
増幅器３は概して大幅な入力レベル変化に対処できない
ため、送信出力の可変範囲を大きくすると送信出力を低
くした時に出力制御の負帰還ループの動作が不安定にな
り易いと云う欠点があった。(Problems to be Solved by the Invention) As described above, in the conventional transmitting output controller 8 that changes the transmitting output by changing the reference 'α pressure, the variable range of the transmitting output is small and ranges from a few dB variation. Well, there is no problem with i9,
Radio equipment that requires variable transmission output in multiple stages has the following drawbacks. In other words, in recent car telephone systems, the variable range of the transmission output is very large, reaching approximately 30 dB, so in order to satisfy such specifications with the conventional circuit system, the dynamic There is a need to widen the range. However, since a car battery is used as a power source for a mobile radio, the maximum detection output voltage is generally 10V even at the rated output. On the other hand, when the output is set to the lowest value, the voltage is very small, several hundred mV, and it is difficult to maintain the transmitting output stably at the specified value due to external noise, power supply voltage fluctuations, or temperature changes. I get into trouble. Also,
As the range of change in the output voltage of the detector 6 increases, the amount of feedback to the voltage controlled attenuator 2 also changes significantly.
The change in the 0 input level becomes large. However, since the power amplifier 3 is generally unable to handle large input level changes, increasing the variable range of the transmission output has the disadvantage that the operation of the negative feedback loop for output control tends to become unstable when the transmission output is lowered. Ta.

本発明の目的は、送信出力を指定する制御信号により一
送信出力信号の一部を検出する検波器への送信出力信号
レベルと電力増幅器の初段増幅部以外の震源′シ圧とを
共に劃−することによって上記欠点を除去し、種々に変
化する規定値に対しても安定に、しかも広範囲にわたっ
て、送信出力の設定が可能なように構成した送信出力制
御回路を提供することにある。An object of the present invention is to control both the transmission output signal level to a detector that detects a part of one transmission output signal and the pressure at the epicenter other than the first stage amplification section of the power amplifier by a control signal specifying the transmission output. It is therefore an object of the present invention to provide a transmission output control circuit configured to eliminate the above-mentioned drawbacks and to be able to set the transmission output stably and over a wide range even with various changing specified values.

（問題点を解決するための手段） 本発明による送信出力制御回路は第１の電圧制御減衰器
または初段増幅部と、′１力増幅器と、方向性結合器と
、第２の電圧制御減衰器と、検波器と、比較増幅器と、
第１〜第３の電圧制御器と、制−器とを具備して構成し
たものである。(Means for Solving the Problems) A transmission output control circuit according to the present invention includes a first voltage-controlled attenuator or first-stage amplifier, a '1 power amplifier, a directional coupler, and a second voltage-controlled attenuator. , a detector, a comparison amplifier,
It is configured to include first to third voltage controllers and a controller.

第１の電圧制御減衰器または初段増幅部は、人力された
送信信号に対して可変減衰量を与える次めのものである
。The first voltage-controlled attenuator or first-stage amplification section is the next one that provides a variable attenuation amount to the human-powered transmission signal.

電力増幅器は、８ｇｌの電圧制御減衰器まｔは初段増幅
部の出力を増幅するためのものである。The power amplifier is for amplifying the output of the 8gl voltage controlled attenuator or first stage amplifier.

方向性結合器は、電力増幅器のＲＦ出力を送信電力とし
て外部負荷〈供給するとともに一部を取出すためのもの
である。The directional coupler is used to supply the RF output of the power amplifier to an external load as transmission power and to extract a portion of the power.

第２の電圧制御減衰器は、方向性結合器により取出され
たＲＦ’出力の一部に対して可変減衰竜を与えるための
ものである。The second voltage controlled attenuator is for providing variable attenuation to a portion of the RF' output extracted by the directional coupler.

検波器は、第２の電圧制御減衰器の出力を直流電圧に変
換するためのものである。The detector is for converting the output of the second voltage controlled attenuator into a DC voltage.

比較増幅器は、検波器によシ得られた直流電圧と別に設
定した基準電圧とを比較して誤差電圧を出力するための
ものである。The comparator amplifier compares the DC voltage obtained by the detector with a separately set reference voltage and outputs an error voltage.

第１の゛電圧制御器は、比較増幅器から出力された誤差
電圧にもとづいて第１の電圧制御減衰器または初段増幅
部を制御するためのものである。The first voltage controller is for controlling the first voltage controlled attenuator or the first stage amplifier based on the error voltage output from the comparator amplifier.

第２の電圧制御器は、第２の電圧制御減衰器のｌ’１．
Ｆ出力を制御するためのものである。The second voltage controller includes l'1. of the second voltage controlled attenuator.
This is for controlling the F output.

第３の電圧制御器は、電力増幅器の利得を制御するため
のものである。The third voltage controller is for controlling the gain of the power amplifier.

制御器は、第２および第３の電圧制御器を制御１−て検
波器から得られる直流電圧を送信電力の値によらずに一
定値になるように設定するためのものである。The controller controls the second and third voltage controllers to set the DC voltage obtained from the detector to a constant value regardless of the value of the transmission power.

（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図および第２図は、それぞれ本発明による送信出力
制御回路の実施例の構成を示すブロック図である。第１
図および第２図において、１は送信信号入力端子、２１
は第１の電圧制御減衰器、３は電力増幅器、３１は電力
増幅７！Ｓ３の初段増幅部、３２は電力増幅器３の増幅
段部、４は方向性結合器、５は送信信号出力端子、６は
検波器、７は基準電圧発生器、８は制御器、９は制御信
号入力端子、１０は比較増幅器、１１１は第１の電圧制
御器、１２は１ＩＸ２の電圧制御減衰器、１３は第２の
制御器、１４は第３の電圧制御器である。FIG. 1 and FIG. 2 are block diagrams each showing the configuration of an embodiment of a transmission output control circuit according to the present invention. 1st
In the figure and FIG. 2, 1 is a transmission signal input terminal, 21
is the first voltage controlled attenuator, 3 is the power amplifier, and 31 is the power amplifier 7! 32 is an amplification stage section of power amplifier 3, 4 is a directional coupler, 5 is a transmission signal output terminal, 6 is a detector, 7 is a reference voltage generator, 8 is a controller, 9 is a control A signal input terminal, 10 is a comparison amplifier, 111 is a first voltage controller, 12 is a 1IX2 voltage controlled attenuator, 13 is a second controller, and 14 is a third voltage controller.

ここでは、説明を簡単にするために送信出力が定格出力
、例えば＋３５ｄＢｍである場合と、最低出力、列えば
＋５ｄＢｍである場合との２段階について説明する。Here, to simplify the explanation, two stages will be described: a case where the transmission output is the rated output, for example, +35 dBm, and a case where the transmission output is the lowest output, for example, +5 dBm.

第１図において、送信出力を定格出力（＋３５ｄＢｍ）
にする場合には、制御信号入力端子９より送信出力を定
格出力（＋３５　ｄＢｍ　’）に指定する制御信号が制
御器８を介して第２および第３の′は圧制御器１３．１
４に加えられる。制御信号が加えられると、第２の電圧
制御器１３では第２の゛電圧制御減衰器１２の減衰量が
定常出力（＋３５ｄＢｍ）と最低出力（−）−５ｄＢｍ
）とのレベルの差、すなわち（＋３５ｄＢｍ）−（＋５
ｄＢｒｎ）＝３０　ｄＢになるような制御電圧を第２の
電圧制御減衰器１２に与える。第３の電圧制御器１４は
、−電力増幅器３の初段増幅部３１に正常な電源電圧を
与える。この状態で方向性結合器４より取出された゛電
力増幅器３の出力の一部は、ｔａ２の電圧制御減衰器１
２により上記の減衰−１だけ減衰され、ダイオードによ
る検波器６によって直流電圧に変換される。この直流電
圧と基４電圧発生器７よシ出力される一定値の基準電圧
とが比較増幅器１０に加えられ、両者の誤差分が誤差電
圧として出力される。この誤差電圧が第１の電圧制御器
１１１を介して第１の電圧制御減衰器２１に制御電圧と
して負帰還される。これによって第１の電圧制御減衰器
２１の減衰量が設定され、電王増１＠器３の出力、すな
わち送信出力が定常値（＋　３５　ｄＢｍ　）に保免れ
る。In Figure 1, the transmission output is the rated output (+35 dBm)
In this case, a control signal specifying the transmission output to the rated output (+35 dBm') is sent from the control signal input terminal 9 via the controller 8 to the pressure controller 13.1.
Added to 4. When the control signal is applied, the second voltage controller 13 changes the attenuation amount of the second voltage control attenuator 12 between the steady output (+35 dBm) and the minimum output (-) -5 dBm.
), i.e. (+35dBm) - (+5
A control voltage such that dBrn)=30 dB is applied to the second voltage controlled attenuator 12. The third voltage controller 14 provides a normal power supply voltage to the first stage amplifying section 31 of the power amplifier 3 . In this state, a part of the output of the power amplifier 3 taken out from the directional coupler 4 is transferred to the voltage controlled attenuator 1 of ta2.
2, the signal is attenuated by the above-mentioned attenuation -1, and converted into a DC voltage by a diode detector 6. This DC voltage and a reference voltage of a constant value outputted from the base 4 voltage generator 7 are applied to a comparator amplifier 10, and an error between the two is outputted as an error voltage. This error voltage is negatively fed back to the first voltage controlled attenuator 21 via the first voltage controller 111 as a control voltage. As a result, the attenuation amount of the first voltage-controlled attenuator 21 is set, and the output of the Deno amplifier 1 @ device 3, that is, the transmission output, is maintained at a steady value (+35 dBm).

次に、送信出力を最低出力（＋５ｄＢｍ）に低下させる
場合には、第２および第３の１圧制御器１３．１４に対
して、送信出力を最低出力値（＋５ｄＢｍ）に指定する
制御信号が？ｔｌｌＪ例−８８から加えられる。そこで
、第２の１圧制御器１３は第２の電圧制御減衰器１２の
減衰量がはソ零になるように制御電圧を与える。第１の
電圧制御減衰器２１の減衰量を上記定格出力（＋　３５
　ｄＢｍ）のときの減衰量とはｙ同じ値に設定した場合
には、第３の電圧制御器１４は送信出力がほぼ最低出力
（＋　５　ｄＢｍ　）になるような直流電圧を゛電力増
幅器３の増幅段部３２の電源電圧として与える。Next, when lowering the transmission output to the minimum output value (+5 dBm), a control signal specifying the transmission output to the minimum output value (+5 dBm) is sent to the second and third 1-pressure controllers 13.14. ? Added from tllJ example-88. Therefore, the second one-voltage controller 13 applies a control voltage so that the amount of attenuation of the second voltage-controlled attenuator 12 becomes zero. The attenuation amount of the first voltage-controlled attenuator 21 is determined by the above rated output (+35
dBm), the third voltage controller 14 sets the DC voltage such that the transmission output becomes almost the minimum output (+5 dBm) to the power amplifier 3. It is given as the power supply voltage of the amplification stage section 32.

従って、送信出力はは”ｒ　（＋３５ｄＢｍ　）−（＋
５ｄＢｍ　）−３０ｄＢだけ低下して、最低出力値（＋
５ｄＢｍ）に保たれる。このように、検波器６の出力′
電圧は送信出力が定格出力（＋３５ｄＢｍ）と最低出力
（＋５ｄＢｒｎ）との場合ではソ等しく、比較的大きな
値になるため、最低出力時でも従来例で示したような外
来雑音、電源電圧変動、あるいは温度変化の影響を受け
ないことになる。Therefore, the transmission output is “r (+35dBm)−(+
5dBm) -30dB to the lowest output value (+
5dBm). In this way, the output of the detector 6'
The voltage is the same when the transmission output is the rated output (+35 dBm) and the lowest output (+5 dBrn), and is a relatively large value, so even at the lowest output, there is no possibility of external noise, power supply voltage fluctuations, or It will not be affected by temperature changes.

送信出力の値によらず比較増幅器１０の誤差出力電圧が
変らないため、負帰還食が一定である。Since the error output voltage of the comparison amplifier 10 does not change regardless of the value of the transmission output, the negative feedback error remains constant.

従って、この誤差出力電圧で第１の電圧制御器１１１を
介して制御される第１の電圧制御器２１の減衰量、す々
わち電力増幅器３の入力レベルも送信出力の値によシ変
化することがない。従って、電力増幅器３は最適動作条
件で動作させることができ、従来例のようだ入力レベル
が大幅に変化して電力増幅器３が不安定になることはな
い。よって、送信出力の値によらないで安定な送信出力
制御が行える。Therefore, the amount of attenuation of the first voltage controller 21 controlled via the first voltage controller 111 using this error output voltage, that is, the input level of the power amplifier 3 also changes depending on the value of the transmission output. There's nothing to do. Therefore, the power amplifier 3 can be operated under optimal operating conditions, and the power amplifier 3 will not become unstable due to a large change in the input level as in the conventional example. Therefore, stable transmission output control can be performed regardless of the value of the transmission output.

ここでは説明の簡単さから、送信出力が定格出力時と最
低出力時との場合を説明したが、送信出力を多段階に変
化させる場合には第２の電圧制御減衰器１２の減衰量と
第３の電圧制御器１４の出力電圧とを上に説明したよう
な方法で設定すればよい。ＩＥＺ図は、電源電圧を制御
して電力増幅器の初段増幅部３１の出力を変化させた場
合の構成を示す実施例であり、それ以外の動作は上記の
説明と同様である。For ease of explanation, the case where the transmission output is at the rated output and the minimum output is explained here, but when changing the transmission output in multiple stages, the attenuation amount of the second voltage-controlled attenuator 12 and the The output voltage of the voltage controller 14 of No. 3 may be set using the method described above. The IEZ diagram is an embodiment showing a configuration in which the power supply voltage is controlled to change the output of the first stage amplifying section 31 of the power amplifier, and the other operations are the same as those described above.

（発明の効果） 本発明は以上説明したように、送信機の電力増幅器の出
力検出量を可変するための電圧制御減衰器と、電力増幅
器の初段増幅部の入力レベル、または電源電圧を負帰還
によって制御する丸めの増幅段部とを備え、送信出力値
にかかわらず負帰還１が一定になるように、送信出力の
指定信号によシ上記電圧制御減衰器と上記増幅段とを制
御することにより、送信出力が変っても安定な出力制御
ができると云う効果がある。(Effects of the Invention) As described above, the present invention includes a voltage control attenuator for varying the output detection amount of a power amplifier of a transmitter, and a negative feedback feedback of the input level of the first stage amplification section of the power amplifier or the power supply voltage. and a rounding amplification stage section controlled by a transmission output value, and controlling the voltage controlled attenuator and the amplification stage according to a designated signal of the transmission output so that the negative feedback 1 is constant regardless of the transmission output value. This has the effect that stable output control can be performed even if the transmission output changes.

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

Ｗ、１図および第２図は、本発明による送信出力制御回
路の実施例を示すブロック図である。 第３図は、従来技術による送信出力制御回路の実例を示
すブロック図である。 ２．１２・・・電圧制御減衰器 ３・・・′１カ増幅器　　　３１・・・初段増幅部３２
・・・増幅段部　　４・・・方向性結合器６・・・検波
器　　７・・・基準電圧発生器８・・・制御器　　　１
ｏ・・・比較器１１・・・電圧制御器　　１１１・・・
電圧制御器１．５．９・・・端子1 and 2 are block diagrams showing embodiments of a transmission output control circuit according to the present invention. FIG. 3 is a block diagram showing an example of a transmission output control circuit according to the prior art. 2.12... Voltage controlled attenuator 3...'1 power amplifier 31... First stage amplifier section 32
...Amplification stage section 4...Directional coupler 6...Detector 7...Reference voltage generator 8...Controller 1
o... Comparator 11... Voltage controller 111...
Voltage controller 1.5.9...terminal

Claims (1)

【特許請求の範囲】[Claims] 入力された送信信号に対して可変減衰量を与えるための
第１の電圧制御減衰器または初段増幅部と、前記第１の
電圧制御減衰器または初段増幅部の出力を増幅するため
の電力増幅器と、前記電力増幅器のＲＦ出力を送信電力
として外部負荷に供給するとともに一部を取出すための
方向性結合器と、前記方向性結合器により取出された前
記ＲＦ出力の一部に対して可変減衰量を与えるための第
２の電圧制御減衰器と、前記第２の電圧制御減衰器の出
力を直流電圧に変換するための検波器と、前記検波器に
より得られた直流電圧と別に設定した基準電圧とを比較
して誤差電圧を出力するための比較増幅器と、前記比較
増幅器から出力された前記誤差電圧にもとづいて前記第
１の電圧制御減衰器または前記初段増幅部を制御するた
めの第１の電圧制御器と、前記第２の電圧制御減衰器の
ＲＦ出力を制御するための第２の電圧制御器と、前記電
力増幅器の利得を制御するための第３の電圧制御器と、
前記第２および第３の電圧制御器を制御して前記検波器
から得られる前記直流電圧を前記送信電力の値によらず
に一定値になるように設定するための制御器とを具備し
て構成したことを特徴とする送信出力制御回路。a first voltage-controlled attenuator or first-stage amplification section for providing a variable attenuation amount to an input transmission signal; and a power amplifier for amplifying the output of the first voltage-controlled attenuator or first-stage amplification section. , a directional coupler for supplying the RF output of the power amplifier to an external load as transmission power and extracting a portion thereof; and a variable attenuation amount for the portion of the RF output extracted by the directional coupler. a second voltage-controlled attenuator for converting the output of the second voltage-controlled attenuator into a DC voltage, and a reference voltage set separately from the DC voltage obtained by the detector. a comparator amplifier for comparing and outputting an error voltage; and a first comparator for controlling the first voltage controlled attenuator or the first stage amplifier based on the error voltage output from the comparator amplifier. a voltage controller, a second voltage controller for controlling the RF output of the second voltage controlled attenuator, and a third voltage controller for controlling the gain of the power amplifier;
and a controller for controlling the second and third voltage controllers to set the DC voltage obtained from the detector to a constant value regardless of the value of the transmission power. A transmission output control circuit characterized by comprising:
JP25360384A 1984-11-30 1984-11-30 Transmission output control circuit Pending JPS61131918A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP25360384A JPS61131918A (en) 1984-11-30 1984-11-30 Transmission output control circuit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP25360384A JPS61131918A (en) 1984-11-30 1984-11-30 Transmission output control circuit

Publications (1)

Publication Number Publication Date
JPS61131918A true JPS61131918A (en) 1986-06-19

Family

ID=17253672

Family Applications (1)

Application Number Title Priority Date Filing Date
JP25360384A Pending JPS61131918A (en) 1984-11-30 1984-11-30 Transmission output control circuit

Country Status (1)

Country Link
JP (1) JPS61131918A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH05218885A (en) * 1992-01-31 1993-08-27 Nec Corp Transmitting power controller

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH05218885A (en) * 1992-01-31 1993-08-27 Nec Corp Transmitting power controller

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