JP2004048797A - Transmitter and power amplifier - Google Patents

Transmitter and power amplifier Download PDF

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JP2004048797A
JP2004048797A JP2003320597A JP2003320597A JP2004048797A JP 2004048797 A JP2004048797 A JP 2004048797A JP 2003320597 A JP2003320597 A JP 2003320597A JP 2003320597 A JP2003320597 A JP 2003320597A JP 2004048797 A JP2004048797 A JP 2004048797A
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power
amplifier
output
gain
variable
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Makoto Katagishi
片岸　誠
Shiro Machida
町田　史郎
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Hitachi Ltd
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Hitachi Ltd
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Abstract

<P>PROBLEM TO BE SOLVED: To reduce current consumption of a transmitter in a CDMA type mobile telephone. <P>SOLUTION: In accordance with transmission powers, n (n>2) bias setting conditions of a power amplification means are stored and when sending a desired transmission power, optimal combination of stored gains and bias conditions is selected. Based upon the selected conditions, a variable amplification means 1 and a power amplification means 2 are controlled. <P>COPYRIGHT: (C)2004,JPO

Description

　本発明は、出力電力制御が可能な送信機とそれに適用可能な電力増幅器の構成
、およびその制御方法に関する。特に制御幅が大きいＣＤＭＡ方式携帯電話に適した送信機に関する。 The present invention relates to a transmitter capable of controlling output power, a configuration of a power amplifier applicable to the transmitter, and a control method thereof. Particularly, the present invention relates to a transmitter suitable for a CDMA mobile phone having a large control width.

　従来の技術の一例としてＣＤＭＡ（符号分割多元接続）方式携帯電話を挙げて説明する。 ここではＣＤＭＡ方式の代表的な規格として米国のＴＩＡ　ＩＳ−
９５を考える。送信機の構成の一例を図７に示す。変調信号は送信周波数帯に周波数変換された後、可変増幅手段１、電力増幅手段２、アンテナ共用器３を介してアンテナ４より送出される。ここで、可変増幅手段１はアンテナ４における所望の送信電力値となるよう制御手段６によって利得を調節される。ＩＳ−９５では基地局の受信電力を一定にするため開ループおよび閉と呼ばれる電力制御を行う。開ループ制御は受信手段５によって検出された受信電界強度情報によって一義的に送信電力値を決定するもので精度はあまり要求されない（±９．５ｄＢ）
。一方、閉ループ制御は基地局より送られてくる利得の増減情報に基づきより細かい制御を行う（１ｄＢステップ）。送信機は始めに開ループ制御を行った後に
閉ループ制御に移行し、基地局が要求する所望の送信電力値に収束する。 A CDMA (Code Division Multiple Access) type mobile phone will be described as an example of the related art. Here, as a typical standard of the CDMA system, TIA IS-
Consider 95. FIG. 7 shows an example of the configuration of the transmitter. The modulated signal is frequency-converted into a transmission frequency band, and then transmitted from an antenna 4 via a variable amplifier 1, a power amplifier 2, and an antenna duplexer 3. Here, the gain of the variable amplifying unit 1 is adjusted by the control unit 6 so as to have a desired transmission power value at the antenna 4. In IS-95, power control called open loop and closed is performed in order to keep the received power of the base station constant. In the open loop control, the transmission power value is uniquely determined based on the reception electric field strength information detected by the reception means 5, and the accuracy is not so required (± 9.5 dB).
. On the other hand, the closed loop control performs finer control based on gain increase / decrease information sent from the base station (1 dB step). The transmitter first performs open-loop control, then transitions to closed-loop control, and converges on the desired transmission power value required by the base station.

　上記のように送信機の送信電力値を可変増幅手段１を制御することによって行っているが、消費電流低減を目的として電力増幅手段２のバイアス条件を送信電力値に応じて制御する方法が一般に考えられている（例えば、特許文献１参照）。
この場合の制御を図８を用いて説明する。 Although the transmission power value of the transmitter is controlled by controlling the variable amplification means 1 as described above, a method of controlling the bias condition of the power amplification means 2 according to the transmission power value for the purpose of reducing current consumption is generally used. It is considered (for example, see Patent Document 1).
The control in this case will be described with reference to FIG.

　電力増幅手段２に例えばディプレッション型ＧａＡｓＦＥＴを用いた場合、ゲートに印加するバイアスを変化させると出力電力と消費電流の関係が変化する（図８の破線）。ゲート電圧を下げれば（バイアス設定値＝Ｂ１）、消費電流が
減るが最大出力電力は低下する。逆にゲート電圧を上げれば（バイアス設定値＝Ｂ２）、最大出力電力は向上するが消費電流が増加する。この特性を利用して電
力増幅手段２のバイアス条件を任意の出力電力の設定値で切換えると、低い出力電力においての消費電流低減が可能となる（図８の実線）。具体的には可変増幅
手段１に対する制御信号をレベル判定手段９によって判別し、任意のしきい値を境に電力増幅手段２のバイアスを切換える。 When a depletion type GaAs FET is used as the power amplifying means 2, when the bias applied to the gate is changed, the relationship between output power and current consumption changes (broken line in FIG. 8). If the gate voltage is lowered (bias set value = B1), the current consumption is reduced, but the maximum output power is reduced. Conversely, when the gate voltage is increased (bias set value = B2), the maximum output power is improved but the current consumption is increased. If the bias condition of the power amplifying means 2 is switched at an arbitrary set value of the output power using this characteristic, the current consumption can be reduced at a low output power (solid line in FIG. 8). Specifically, the control signal for the variable amplifying means 1 is determined by the level determining means 9, and the bias of the power amplifying means 2 is switched at an arbitrary threshold.

特開平９−４６１５２号公報JP-A-9-46152

　従来の技術は、例えば２０ｄＢ程度の可変幅で４ｄＢステップの制御を行うＰＤＣ方式（ＲＣＲ　ＳＴＤ−２７）で有効である。一方、ＩＳ−９５では７０ｄＢ以上の可変幅で１ｄＢステップの制御を行うため、消費電流を低減するためにはより細やかなバイアス制御が必要になる。 The conventional technique is effective in a PDC system (RCRＤSTD-27) that performs control in 4 dB steps with a variable width of about 20 dB, for example. On the other hand, in IS-95, since the control is performed in 1 dB steps with a variable width of 70 dB or more, finer bias control is required to reduce current consumption.

　上記課題は以下の制御を行うことにより解決される。即ち、制御手段６が電力増幅手段２における任意の出力電力を得る可変増幅手段１の利得および電力増幅手段２のバイアス条件の組合わせをｎ個（ｎ＞２）の電力増幅手段２の出力電力に対応付けて記憶する。さらに、電力増幅手段２における所望の出力電力を発生するときに、記憶した利得およびバイアス条件の組合わせの中から最適なものを１つ選択し、選択した条件に基づいて可変増幅手段１および電力増幅手段２を制御する。または、電力増幅手段２のバイアス条件を電力増幅手段２の出力電力あるいは可変増幅手段１における利得設定値の関数として記憶し、電力増幅手段２における所望の出力電力を発生するときに記憶した関数を用いて算出されたバイアス制御信号と利得制御信号に基づいて可変増幅手段１および電力増幅手段２を制御する。 The above problem is solved by performing the following control. That is, the control means 6 determines the combination of the gain of the variable amplifying means 1 and the bias condition of the power amplifying means 2 for obtaining an arbitrary output power in the power amplifying means 2 by the output power of n (n> 2) power amplifying means 2. Is stored in association with. Further, when a desired output power is generated in the power amplifying means 2, one of the optimum combinations of the stored gain and bias conditions is selected, and the variable amplifying means 1 and the power are selected based on the selected condition. It controls the amplification means 2. Alternatively, the bias condition of the power amplifying means 2 is stored as a function of the output power of the power amplifying means 2 or the gain setting value of the variable amplifying means 1, and the function stored when the desired output power of the power amplifying means 2 is generated. The variable amplifying means 1 and the power amplifying means 2 are controlled based on the bias control signal and the gain control signal calculated by using the above.

　電力増幅手段のバイアス条件を送信電力に応じて細かく制御することにより、消費電流の低減が実現できる。 (4) By finely controlling the bias condition of the power amplifying means according to the transmission power, it is possible to reduce current consumption.

　以下、本発明の実施例を図面を用いて詳細に説明する。従来技術と同様に Ｃ
ＤＭＡ（符号分割多元接続）方式携帯電話に適用した場合を例に挙げて説明する
。 Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. C as in the prior art
A case where the present invention is applied to a DMA (Code Division Multiple Access) type mobile phone will be described as an example.

　図１は本発明の第１の実施例を示すシステム構成図である。前述の従来技術と同様の構成であるがその制御方法が異なる。制御方法を図２を用いて説明する。 FIG. 1 is a system configuration diagram showing a first embodiment of the present invention. Although the configuration is the same as that of the above-described conventional technology, the control method is different. The control method will be described with reference to FIG.

　可変増幅手段１はアンテナ４における所望の送信電力値となるよう制御手段６によって利得を調節され、このときの設定値を制御手段６が記憶している（図２中Ｇ１、Ｇ２、…、Ｇｎのｎ個、ｎ＞２）。さらに制御手段６は可変増幅手段１
の各設定に対応した電力増幅手段２のバイアス条件を記憶している（図２中Ｂ１
、Ｂ２、…、Ｂｎ のｎ個、ｎ＞２）。電力増幅手段２のバイアス条件が一定の
ときは図２の破線に示すように、バイアス条件によって最大出力電力と消費電流の関係が異なる。この関係を利用し、可変増幅手段１の利得に応じてバイアス条件を変えた場合図２の実線のような特性を得ることができる。したがって、同一の出力電力が得られ且つ消費電流の少ないバイアス条件を選択して記憶し、所望の送信電力を送出するときに記憶した条件に基づいて可変増幅手段１および電力増幅手段２を制御することにより送信機の消費電流を低減することができる。実際には送信電力以外の性能（隣接チャネル電力漏洩など）を満たす範囲内でバイアス条件を選ぶことになるが、前述の従来技術と比較し、消費電流を削減できる送信電力範囲が著しく広くすることができる。 The gain of the variable amplifying means 1 is adjusted by the control means 6 so as to obtain a desired transmission power value in the antenna 4, and the set value at this time is stored in the control means 6 (G1, G2,..., Gn in FIG. 2). N, n> 2). Further, the control means 6 includes the variable amplifying means 1
The bias condition of the power amplifying means 2 corresponding to each setting is stored (B1 in FIG. 2).
, B2,..., Bn, n> 2). When the bias condition of the power amplifying means 2 is constant, the relationship between the maximum output power and the current consumption differs depending on the bias condition, as shown by the broken line in FIG. By utilizing this relationship and changing the bias condition in accordance with the gain of the variable amplifying means 1, the characteristic as shown by the solid line in FIG. 2 can be obtained. Therefore, a bias condition that can obtain the same output power and consumes less current is selected and stored, and the variable amplifying unit 1 and the power amplifying unit 2 are controlled based on the stored condition when a desired transmission power is transmitted. Thus, the current consumption of the transmitter can be reduced. In practice, the bias condition will be selected within a range that satisfies the performance other than the transmission power (such as adjacent channel power leakage), but the transmission power range in which the current consumption can be reduced is significantly wider than that of the above-mentioned conventional technology. Can be.

　また、本実施例においてｎ個のバイアス条件を用いる代わりに、電力増幅手段２のバイアス条件を電力増幅手段２の出力電力あるいは可変増幅手段１における利得設定値の関数として記憶しても良い。この場合、所望の電力増幅手段２の出力電力を発生するときに記憶した関数を用いて算出された電力増幅手段２のバイアス制御信号および可変増幅手段１の利得設定値に基づいて可変増幅手段１および電力増幅手段２を制御する。その結果、送信機の消費電流低減が可能となる。 Instead of using the n bias conditions in the present embodiment, the bias condition of the power amplifying means 2 may be stored as a function of the output power of the power amplifying means 2 or the gain setting value of the variable amplifying means 1. In this case, based on the bias control signal of the power amplifying means 2 and the gain setting value of the variable amplifying means 1 calculated using the function stored when the desired output power of the power amplifying means 2 is generated, And the power amplifier 2. As a result, the current consumption of the transmitter can be reduced.

　図３は本発明の第２の実施例を示すシステム構成図である。本実施例は第１の実施例において電力増幅手段２のバイアスを制御するバイアス制御信号にパルス幅変調（ＰＷＭ）を用いた場合である。一般に、バイアスを制御する場合は制御手段内に具備されたＤ／Ａ（ディジタル・アナログ変換器）によって発生する直流電圧をバイアス制御信号に用いることがある。しかし、出力電圧の分解能を上げると高価なＤ／Ａが必要となるとういう問題が発生する。ＰＷＭを用いた場合
、Ｄ／Ａが不要となりコスト低減が可能になる。また、第１の実施例に示したようなバイアス条件を関数で算出する場合の実装に都合がよい。バイアス制御信号にＰＷＭを用いた場合に適した電力増幅手段２の構成は図３に示すように内部に平滑回路を設け、電力増幅手段２の内部でバイアスに変換する。この場合、平滑手段が電力増幅手段２の内部に設けられたことにより外来雑音による影響を軽減することができる。 FIG. 3 is a system configuration diagram showing a second embodiment of the present invention. This embodiment is a case where pulse width modulation (PWM) is used as a bias control signal for controlling the bias of the power amplifying means 2 in the first embodiment. Generally, when controlling the bias, a DC voltage generated by a digital-to-analog converter (D / A) provided in the control means may be used as a bias control signal. However, increasing the resolution of the output voltage causes a problem that an expensive D / A is required. When PWM is used, D / A becomes unnecessary and cost can be reduced. Also, it is convenient to implement the case where the bias condition as shown in the first embodiment is calculated by a function. A suitable configuration of the power amplifying means 2 when PWM is used for the bias control signal is such that a smoothing circuit is provided inside as shown in FIG. In this case, the influence of external noise can be reduced by providing the smoothing means inside the power amplifying means 2.

　図４は本発明の第３の実施例を示すシステム構成図であり、可変増幅手段１と電力増幅手段２を統合した電力増幅器８の構成を示している。一般に可変増幅手段１と電力増幅手段２を統合した場合図９に示すように可変増幅手段１と電力増幅手段２に対する各制御信号は別々の端子を介して入力されていた。所望の送信電力を得るこれら制御信号の組合わせが１つの送信電力値に対して１組にも関わらずである。本実施例では所望の出力電力を得るための制御信号は唯一とし、電力増幅器８の内部に可変増幅手段１の利得制御信号および電力増幅手段２のバイアス制御信号を発生する信号発生手段７を設けている。信号発生手段７は制御手段６からの制御信号に応じて利得制御信号およびバイアス制御信号を発生する。以上の構成により制御手段６の処理を軽減できる使い勝手の良い電力増幅器８が得られる。 FIG. 4 is a system configuration diagram showing a third embodiment of the present invention, and shows a configuration of a power amplifier 8 in which a variable amplification unit 1 and a power amplification unit 2 are integrated. Generally, when the variable amplifying means 1 and the power amplifying means 2 are integrated, as shown in FIG. 9, each control signal for the variable amplifying means 1 and the power amplifying means 2 is input via separate terminals. The combination of these control signals to obtain the desired transmission power is irrespective of one set for one transmission power value. In the present embodiment, only one control signal for obtaining a desired output power is provided, and a signal generating means 7 for generating a gain control signal for the variable amplifying means 1 and a bias control signal for the power amplifying means 2 is provided inside the power amplifier 8. ing. The signal generator 7 generates a gain control signal and a bias control signal according to the control signal from the controller 6. With the above-described configuration, an easy-to-use power amplifier 8 that can reduce the processing of the control unit 6 can be obtained.

　図５は本発明の第４の実施例を示すシステム構成図であり、最大電力検出機能を有する電力増幅器８とそれを具備する送信機の構成を示している。ＩＳ−９５では前述のように基地局から送られてくる送信電力増減信号によって送信電力を制御する（前述の閉ループ制御）。したがって、基地局が自局の送信電力を検出
するので、基本的には自局内での電力検出は不要である。しかし実際には特表平８−５１０６１４に示されているように、基地局より送られてくる送信電力増減信号が送信機の（歪み等の特性保証範囲内での）最大出力を超えてしまう場合があり、これを検出して送信出力を制限するために図１０に示すような電力検出の構成が必要である。すなわち、電力増幅手段２の出力の一部を結合器２０３を介して電力検出手段２０４に導き、制御手段が電力検出手段２０４の出力を任意のしきい値と比較することにより最大電力の検出・判別を行う。これに対し本実施例では、結合器２０３、電力検出手段２０４および最大電力の判別を行う判別手段２０５を電力増幅器８に具備している。判別手段２０５は最大電力を検出した場合に任意の信号を制御手段６に出力するとともに増幅器２０２の出力電飾を制限するよう制御する。この構成により送信機の部品数削減が可能になるとともに
、制御手段６の処理を軽減できる使い勝手の良い電力増幅器８が得られる。 FIG. 5 is a system configuration diagram showing a fourth embodiment of the present invention, and shows the configuration of a power amplifier 8 having a maximum power detection function and a transmitter including the same. In IS-95, the transmission power is controlled by the transmission power increase / decrease signal transmitted from the base station as described above (the closed loop control described above). Therefore, since the base station detects its own transmission power, it is basically unnecessary to detect the power within its own station. However, in practice, as shown in JP-T-Hei 8-510614, the transmission power increase / decrease signal transmitted from the base station exceeds the maximum output of the transmitter (within the guaranteed characteristic range such as distortion). In some cases, a power detection configuration as shown in FIG. 10 is required to detect this and limit the transmission output. That is, a part of the output of the power amplifying means 2 is guided to the power detecting means 204 via the coupler 203, and the control means compares the output of the power detecting means 204 with an arbitrary threshold value to detect the maximum power. Make a determination. On the other hand, in the present embodiment, the power amplifier 8 includes the coupler 203, the power detection means 204, and the determination means 205 for determining the maximum power. When the maximum power is detected, the determination unit 205 outputs an arbitrary signal to the control unit 6 and controls so as to limit the output illumination of the amplifier 202. With this configuration, it is possible to reduce the number of components of the transmitter, and to obtain an easy-to-use power amplifier 8 that can reduce the processing of the control unit 6.

　図６は本発明の第５の実施例を示すシステム構成図であり、最大電力検出あるいは過電流検出機能を有する電力増幅器８とそれを具備する送信機の構成を示している。電力増幅器８の出力電力と消費電流の間には相関があるので、第４の実施例で述べた最大電力検出を電流値で検出することが可能である。電流値の検出は電流検出手段２０６で行いこの出力値が任意のしきい値を超えた場合に任意の信号を制御手段６に出力するとともに増幅器２０２の出力電飾を制限するよう制御する。この構成により送信機の部品数削減が可能になるとともに、制御手段６の処理を軽減できる使い勝手の良い電力増幅手段２が得られる。さらに第４の実施例に対し信号経路に結合器２０３を有していないため低損失となり、電力増幅器８の省電流化を図ることができる。 FIG. 6 is a system configuration diagram showing a fifth embodiment of the present invention, and shows the configuration of a power amplifier 8 having a maximum power detection or overcurrent detection function and a transmitter including the same. Since there is a correlation between the output power of the power amplifier 8 and the current consumption, the maximum power detection described in the fourth embodiment can be detected by the current value. The detection of the current value is performed by the current detection means 206, and when this output value exceeds an arbitrary threshold value, an arbitrary signal is output to the control means 6 and the output illumination of the amplifier 202 is controlled so as to be limited. With this configuration, it is possible to reduce the number of components of the transmitter and obtain the easy-to-use power amplifying unit 2 that can reduce the processing of the control unit 6. Further, since the coupler 203 is not provided in the signal path as compared with the fourth embodiment, the loss is reduced, and the current consumption of the power amplifier 8 can be reduced.

　本実施例において、しきい値を増幅器２０２の異常を示す値として別に設け、電流検出手段２０６の出力値がこのしきい値を超えた場合に任意の信号を制御手段６に出力するとともに増幅器２０２の動作を停止するよう制御することにより電力増幅器８の故障検出および破壊防止が可能となる。 In this embodiment, a threshold value is separately provided as a value indicating an abnormality of the amplifier 202. When the output value of the current detection means 206 exceeds this threshold value, an arbitrary signal is output to the control means 6 and the amplifier 202 Is controlled to stop the operation of the power amplifier 8, it is possible to detect the failure of the power amplifier 8 and prevent the destruction.

　なお、上記実施例の構成において、可変増幅手段１および電力増幅手段２の間にフィルタ等が挿入されても同様の効果が得られることは自明である。 In the configuration of the above embodiment, it is obvious that a similar effect can be obtained even if a filter or the like is inserted between the variable amplifying unit 1 and the power amplifying unit 2.

本発明の第１の実施例を示す構成図。FIG. 1 is a configuration diagram showing a first embodiment of the present invention. 本発明の第１の実施例の制御を説明する図。FIG. 4 is a diagram for explaining control according to the first embodiment of the present invention. 本発明の第２の実施例を示す構成図。FIG. 4 is a configuration diagram showing a second embodiment of the present invention. 本発明の第３の実施例を示す構成図。FIG. 9 is a configuration diagram illustrating a third embodiment of the present invention. 本発明の第４の実施例の制御を説明する図。FIG. 9 is a diagram for explaining control according to a fourth embodiment of the present invention. 本発明の第５の実施例を示す構成図。FIG. 9 is a configuration diagram illustrating a fifth embodiment of the present invention. 従来の技術の一例を説明する構成図。FIG. 1 is a configuration diagram illustrating an example of a conventional technique. 従来の技術における制御の一例を説明する図。The figure explaining an example of the control in the prior art. 従来の技術の一例を説明する構成図。FIG. 1 is a configuration diagram illustrating an example of a conventional technique. 従来の技術の一例を説明する構成図。FIG. 1 is a configuration diagram illustrating an example of a conventional technique.

符号の説明Explanation of reference numerals

１…可変増幅手段、２…電力増幅手段、３…アンテナ共用器、４…アンテナ、
５…受信手段、６…制御手段、７…信号発生手段、８…電力増幅器、９…レベル判定手段、２０１…平滑手段、２０２…増幅器、２０３…結合器、２０４…電力検出手段、２０５…判別手段、２０６…電流検出手段。
DESCRIPTION OF SYMBOLS 1 ... Variable amplification means, 2 ... Power amplification means, 3 ... Antenna sharing device, 4 ... Antenna,
5 receiving means, 6 controlling means, 7 signal generating means, 8 power amplifier, 9 level determining means, 201 smoothing means, 202 amplifier, 203 combining device, 204 power detecting means, 205 distinguishing Means, 206: Current detecting means.

Claims (11)

　送信電力を可変制御可能な送信機において、利得制御信号に応じて出力電力を制御する可変増幅手段と、該可変増幅手段の出力信号を増幅する電力増幅手段と
、該電力増幅手段のバイアス条件および上記可変増幅手段の利得を制御する制御手段を具備し、
　該制御手段は、上記電力増幅手段における任意の出力電力を得る上記可変増幅手段の利得および上記電力増幅手段のバイアス条件の組合わせをｎ個（ｎ＞２）の上記電力増幅手段の出力電力に対応付けて記憶し、上記電力増幅手段における所望の出力電力を発生するときに記憶した上記利得制御信号および上記バイアス制御信号の組合わせの中から最適なものを１つ選択し、該選択した組合わせに基づいて上記可変増幅手段および上記電力増幅手段を制御することを特徴とする送信機。 In a transmitter capable of variably controlling transmission power, a variable amplifier for controlling output power in accordance with a gain control signal, a power amplifier for amplifying an output signal of the variable amplifier, a bias condition of the power amplifier, and Comprising control means for controlling the gain of the variable amplification means,
The control means converts the combination of the gain of the variable amplifying means for obtaining an arbitrary output power in the power amplifying means and the bias condition of the power amplifying means to n (n> 2) output powers of the power amplifying means. One of the combinations of the gain control signal and the bias control signal stored in association with each other and stored when the desired output power is generated in the power amplifying means is selected, and the selected set is selected. A transmitter that controls the variable amplifying unit and the power amplifying unit based on the combination. 　送信電力を可変制御可能な送信機において、利得制御信号に応じて出力電力を制御する可変増幅手段と、該可変増幅手段の出力信号を増幅する電力増幅手段と
、該電力増幅手段のバイアス条件および上記可変増幅手段の利得を制御する制御手段を具備し、
　該制御手段は、上記電力増幅手段のバイアス条件を上記電力増幅手段の出力電力あるいは上記可変増幅手段における利得設定値の関数として記憶し、上記電力増幅手段における所望の出力電力を発生するときに記憶した関数を用いて算出されたバイアス制御信号と上記利得制御信号に基づいて上記可変増幅手段および上記電力増幅手段を制御することを特徴とする送信機。 In a transmitter capable of variably controlling transmission power, a variable amplifier for controlling output power in accordance with a gain control signal, a power amplifier for amplifying an output signal of the variable amplifier, a bias condition of the power amplifier, and Comprising control means for controlling the gain of the variable amplification means,
The control means stores the bias condition of the power amplifying means as a function of the output power of the power amplifying means or the gain setting value of the variable amplifying means, and stores the desired output power in the power amplifying means. A transmitter that controls the variable amplifier and the power amplifier based on the bias control signal and the gain control signal calculated using the function. 　請求項１乃至２に記載の送信機において、前記制御手段が前記電力増幅手段のバイアス条件を制御する信号としてパルス幅変調（ＰＷＭ）を用いることを特徴とする送信機。 The transmitter according to claim 1, wherein the control means uses pulse width modulation (PWM) as a signal for controlling a bias condition of the power amplifying means. 　請求項３に記載の送信機に適用可能な電力増幅手段において、前記制御手段が出力するパルス幅変調（ＰＷＭ）信号を平滑する手段を設けたことを特徴とする電力増幅器。 (4) A power amplifier applicable to the transmitter according to (3), further comprising means for smoothing a pulse width modulation (PWM) signal output by the control means. 　請求項１乃至３に記載の送信機において、送信電力の制御を自局に設けた受信手段によって検出した受信電界強度に応じて制御することを特徴とした送信機。 (4) The transmitter according to any one of (1) to (3), wherein control of transmission power is controlled in accordance with a received electric field intensity detected by a receiving means provided in the own station. 　利得制御信号に応じて出力電力を制御する可変増幅手段と、該可変増幅手段の出力信号を増幅する電力増幅手段と、該電力増幅手段のバイアス条件および上記可変増幅手段の利得を制御する信号を発生する信号発生手段を具備した電力増幅器であって、
　上記信号発生器は該電力増幅器外部から印加されるただ１つの制御信号を入力し、該制御信号に応じて上記電力増幅手段のバイアス条件および上記可変増幅手段の利得を制御することを特徴とする電力増幅器。 A variable amplifier for controlling output power according to a gain control signal; a power amplifier for amplifying an output signal of the variable amplifier; a bias condition for the power amplifier and a signal for controlling the gain of the variable amplifier. A power amplifier comprising signal generating means for generating,
The signal generator receives only one control signal applied from outside the power amplifier, and controls a bias condition of the power amplifier and a gain of the variable amplifier according to the control signal. Power amplifier. 　請求項６に記載の送信機において、送信電力の制御を自局に設けた受信手段によって検出した受信電界強度に応じて制御することを特徴とした送信機。 (7) The transmitter according to (6), wherein control of transmission power is controlled in accordance with a received electric field strength detected by a receiving means provided in the own station. 　増幅器と該増幅器の出力電力の一部を分離出力する結合器と、該結合器の出力電力値を検出する電力検出手段と、該電力検出手段の出力と任意のしきい値との大小関係を判別する判別手段とを具備する電力増幅器あって、
　上記電力検出手段の出力値が任意のしきい値を超えている場合に上記増幅器の動作を停止あるいは利得を低減するよう制御することを特徴とする電力増幅器。 An amplifier, a coupler for separating and outputting a part of the output power of the amplifier, power detection means for detecting an output power value of the coupler, and a magnitude relationship between an output of the power detection means and an arbitrary threshold value. There is a power amplifier having a discriminating means for discriminating,
A power amplifier, wherein when the output value of the power detection means exceeds an arbitrary threshold value, the operation of the amplifier is stopped or the gain is reduced. 　請求項８に記載の電力増幅器において、前記電力検出手段の出力値が任意のしきい値を超えている場合に前記増幅器の動作を停止あるいは利得を低減するよう制御するとともに、上記に具備された任意の端子にしきい値を超えたことを示す信号を出力することを特徴とする電力増幅器。 9. The power amplifier according to claim 8, wherein when the output value of the power detection means exceeds an arbitrary threshold value, the operation of the amplifier is stopped or the gain is reduced, and the power amplifier is provided. A power amplifier that outputs a signal indicating that a threshold value has been exceeded to an arbitrary terminal. 　増幅器と該増幅器の消費電流を検出する電流検出手段と、該電流検出手段の出力と任意のしきい値との大小関係を判別する判別手段とを具備する電力増幅器であって、
　上記電力検出手段の出力値が任意のしきい値を超えている場合に上記増幅器の動作を停止あるいは利得を低減するよう制御することを特徴とする電力増幅器。 A power amplifier comprising: an amplifier; current detection means for detecting current consumption of the amplifier; and determination means for determining a magnitude relationship between an output of the current detection means and an arbitrary threshold.
A power amplifier, wherein when the output value of the power detection means exceeds an arbitrary threshold value, the operation of the amplifier is stopped or the gain is reduced. 　請求項１０に記載の電力増幅器において、前記電流検出手段の出力値が任意のしきい値を超えている場合に前記増幅器の動作を停止あるいは利得を低減するよう制御するとともに、上記に具備された任意の端子にしきい値を超えたことを示す信号を出力することを特徴とする電力増幅器。
11. The power amplifier according to claim 10, wherein when the output value of the current detection means exceeds an arbitrary threshold value, the operation of the amplifier is controlled to be stopped or the gain is reduced, and the power amplifier is provided. A power amplifier that outputs a signal indicating that a threshold value has been exceeded to an arbitrary terminal.
JP2003320597A 2003-09-12 2003-09-12 Transmitter and power amplifier Pending JP2004048797A (en)

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