JP2000188556A - Communication equipment - Google Patents
Communication equipmentInfo
- Publication number
- JP2000188556A JP2000188556A JP10363898A JP36389898A JP2000188556A JP 2000188556 A JP2000188556 A JP 2000188556A JP 10363898 A JP10363898 A JP 10363898A JP 36389898 A JP36389898 A JP 36389898A JP 2000188556 A JP2000188556 A JP 2000188556A
- Authority
- JP
- Japan
- Prior art keywords
- transmission
- power
- output
- output power
- voltage
- 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
Links
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- Transmitters (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】この発明は、送信出力電力を
切り替えて使用する通信機に係り、更に詳しくは電源効
率の向上に関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a communication device for switching and using transmission output power, and more particularly to improving power supply efficiency.
【０００２】[0002]
【従来の技術】従来の技術の一例として、図２に示すよ
うに、送信出力電力を１ｗと５ｗの何れかに切り替えて
使用する携帯無線機の送信回路について説明する。図２
において、１は電圧制御発振器、２は送信緩衝増幅器、
３は送信電力増幅器、４は送／受切り替えスイッチ、５
は低域通過帯域フィルタ、６はアンテナ、７は結合器、
８は検波器、９は比較器、１０は基準電圧、１１は出力
電力切り替えスイッチ、１２は１ｗ時バイアス電圧、１
３は５ｗ時バイアス電圧、１４はＣＰＵである。電圧制
御発振器１より出力された高周波送信信号は、送信緩衝
増幅器２で増幅され、さらに送信電力増幅器３で規定出
力電力まで増幅される。その後、送受信を切り替える送
／受切り替えスイッチ４を通過し、さらに低域通過帯域
フィルタ５を通り、アンテナ６より出力される。一方、
送信電力増幅器３より出力された電力の一部は、結合器
７で取り出され、検波器８で直流電圧に変換される。こ
の電圧を比較器９において、基準電圧１０と比較し、送
信緩衝増幅器２の駆動電圧を制御し、送信緩衝増幅器２
の出力電力を変化させる。その結果、検波電圧と基準電
圧１０が等しくなるようなループを形成することにな
り、アンテナ６より出力される送信電力が一定となるよ
うに制御する。2. Description of the Related Art As an example of the prior art, as shown in FIG. 2, a description will be given of a transmission circuit of a portable radio device used by switching the transmission output power between 1 w and 5 w. FIG.
Wherein 1 is a voltage controlled oscillator, 2 is a transmission buffer amplifier,
3 is a transmission power amplifier, 4 is a transmission / reception switch, 5
Is a low pass band filter, 6 is an antenna, 7 is a coupler,
8 is a detector, 9 is a comparator, 10 is a reference voltage, 11 is an output power switch, 12 is a 1w bias voltage, 1
Reference numeral 3 denotes a 5w bias voltage, and 14 denotes a CPU. The high-frequency transmission signal output from the voltage-controlled oscillator 1 is amplified by the transmission buffer amplifier 2 and further amplified by the transmission power amplifier 3 to the specified output power. Thereafter, the signal passes through a transmission / reception switch 4 for switching between transmission and reception, passes through a low-pass bandpass filter 5, and is output from an antenna 6. on the other hand,
Part of the power output from the transmission power amplifier 3 is taken out by the coupler 7 and converted into a DC voltage by the detector 8. This voltage is compared with a reference voltage 10 in a comparator 9 to control the driving voltage of the transmission buffer amplifier 2 and
Change the output power. As a result, a loop is formed such that the detection voltage and the reference voltage 10 become equal, and control is performed so that the transmission power output from the antenna 6 is constant.
【０００３】この時、出力電力切り替えスイッチ１１に
より、送信電力増幅器３のバイアス電圧は、１ｗ時バイ
アス電圧１２もしくは５ｗ時バイアス電圧１３の何れか
に接続されている。また、ＣＰＵ１４は基準電圧１０を
制御している。図２の従来の通信機において、送信出力
電力を１ｗに設定する場合は、出力電力切り替えスイッ
チ１１を１ｗ時バイアス電圧１２側に切り替える。それ
によって、バイアス電圧が変化し、低出力送信電力増幅
器となる。一方、送信出力電力を５ｗに設定するとき
は、出力電力切り替えスイッチ１１を５ｗ時バイアス電
圧１３側に切り替えることで、高出力送信電力増幅器と
なる。At this time, the output power switch 11 connects the bias voltage of the transmission power amplifier 3 to either the 1w bias voltage 12 or the 5w bias voltage 13. Further, the CPU 14 controls the reference voltage 10. In the conventional communication device of FIG. 2, when setting the transmission output power to 1 w, the output power switch 11 is switched to the 1 w-time bias voltage 12 side. As a result, the bias voltage changes, resulting in a low output transmission power amplifier. On the other hand, when the transmission output power is set to 5w, the output power switch 11 is switched to the 5w-time bias voltage 13 side to provide a high output transmission power amplifier.
【０００４】このようにして、出力電力の切り替えは、
送信電力増幅器３のバイアス電圧変更により生じる回路
の不整合には無関係に行われる。[0004] In this way, switching of output power is performed by:
This is performed irrespective of circuit mismatch caused by a change in the bias voltage of the transmission power amplifier 3.
【０００５】[0005]
【発明が解決しようとする課題】上述したように、従来
の通信機では、送信出力電力の切り替えは電力値を変更
するのみであり、送信電力増幅器の整合不整合に関係な
く出力電力を加減させるため、送信電力増幅器の効率即
ち通信機器の電源効率は低下し、電源の能力を最大限に
活用できない問題を招来していた。As described above, in the conventional communication device, switching of the transmission output power only changes the power value, and adjusts the output power regardless of the matching mismatch of the transmission power amplifier. For this reason, the efficiency of the transmission power amplifier, that is, the power efficiency of the communication device is reduced, which causes a problem that the capability of the power cannot be used to the maximum.
【０００６】[0006]
【課題を解決するための手段】本発明は、上記の問題を
解決するため、送信出力電力を切り替えて使用する通信
機において、その送信回路に、送信出力電力切り替え時
に生じる回路の不整合状態を補償し、インピーダンスを
整合せしめる補償手段を備えるように構成したものであ
る。従って本発明によれば、送信出力電力を切り替えて
使用する通信機において、設定した送信出力電力に対応
して最適な電源効率を得ることが可能になる。SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention provides a communication device which switches and uses transmission output power. It is configured to have a compensating means for compensating and matching the impedance. Therefore, according to the present invention, it is possible to obtain an optimum power supply efficiency corresponding to the set transmission output power in a communication device that switches and uses the transmission output power.
【０００７】[0007]
【発明の実施の形態】以下、本発明の一実施例として、
送信電力増幅器のバイアス電圧により、送信出力電力を
１ｗと５ｗの何れかに切り替えて使用する携帯無線機の
一例について図１を参照して説明する。図１において、
１は電圧制御発振器、２は送信緩衝増幅器、３は送信電
力増幅器、４は送／受切り替えスイッチ、５は低域通過
帯域フィルタ、６はアンテナ、７は結合器、８は検波
器、９は比較器、１０は基準電圧、１１は出力電力切り
替えスイッチ、１２は１ｗ時バイアス電圧、１３は５ｗ
時バイアス電圧、１４はＣＰＵ、１５は可変容量素子で
ある。BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, as one embodiment of the present invention,
An example of a portable wireless device used by switching the transmission output power between 1 w and 5 w according to the bias voltage of the transmission power amplifier will be described with reference to FIG. In FIG.
1 is a voltage controlled oscillator, 2 is a transmission buffer amplifier, 3 is a transmission power amplifier, 4 is a transmission / reception switch, 5 is a low-pass bandpass filter, 6 is an antenna, 7 is a coupler, 8 is a detector, and 9 is a detector. Comparator, 10 is a reference voltage, 11 is an output power switch, 12 is a 1 w bias voltage, and 13 is 5 w
An hour bias voltage, 14 is a CPU, and 15 is a variable capacitance element.
【０００８】図中、電圧制御発振器１より出力された高
周波送信信号は、送信緩衝増幅器２で増幅され、さらに
送信電力増幅器３で規定出力電力まで増幅される。その
後、送受信を切り替える送／受切り替えスイッチ４を通
過し、さらに低域通過帯域フィルタ５を通り、アンテナ
６より出力される。一方、送信電力増幅器３より出力さ
れた電力の一部は結合器７で取り出され、検波器８で直
流電圧に変換される。この電圧を比較器９において、基
準電圧１０と比較し、送信緩衝増幅器２の駆動電圧を制
御し、送信緩衝増幅器２の出力電力を変化させる。その
結果、検波電圧と基準電圧が等しくなるようなループを
形成することになり、アンテナ６より出力される送信電
力を一定に制御する。また、ＣＰＵ１４は基準電圧１０
を制御している。In the figure, a high-frequency transmission signal output from a voltage controlled oscillator 1 is amplified by a transmission buffer amplifier 2 and further amplified by a transmission power amplifier 3 to a specified output power. Thereafter, the signal passes through a transmission / reception switch 4 for switching between transmission and reception, passes through a low-pass bandpass filter 5, and is output from an antenna 6. On the other hand, a part of the power output from the transmission power amplifier 3 is taken out by the coupler 7 and converted into a DC voltage by the detector 8. This voltage is compared with the reference voltage 10 in the comparator 9 to control the driving voltage of the transmission buffer amplifier 2 and change the output power of the transmission buffer amplifier 2. As a result, a loop is formed such that the detection voltage and the reference voltage become equal, and the transmission power output from the antenna 6 is controlled to be constant. The CPU 14 has a reference voltage 10
Is controlling.
【０００９】この時、この送信電力増幅器３の特性につ
いて図３〜図５を用いて説明する。図３は本実施例にお
ける送信電力増幅器のバイアス電圧対効率特性を示し、
図４は本実施例における送信電力増幅器の効率対周波数
特性を示す。ここで、出力側に容量を増加することで、
効率対周波数特性曲線の最大点は周波数低域にシフトす
る。次に、電圧可変容量素子１５は、例えば図５に示す
容量対印加電圧特性を有するものとする。図３と図４に
示すように、出力電力１ｗ時と５ｗ時では、効率の絶対
値の最大効率点がずれているが、これはバイアス電圧の
低下に伴い動作インピーダンスが変化することで、１ｗ
時の効率対周波数特性曲線がｆ0 において若干不整合に
なったためである。At this time, the characteristics of the transmission power amplifier 3 will be described with reference to FIGS. FIG. 3 shows a bias voltage versus efficiency characteristic of the transmission power amplifier in the present embodiment,
FIG. 4 shows the efficiency versus frequency characteristics of the transmission power amplifier according to the present embodiment. Here, by increasing the capacity on the output side,
The maximum point of the efficiency versus frequency characteristic curve shifts to a lower frequency band. Next, it is assumed that the voltage variable capacitance element 15 has, for example, a capacitance-applied voltage characteristic shown in FIG. As shown in FIGS. 3 and 4, the maximum efficiency point of the absolute value of the efficiency is different between the output power of 1 w and the output power of 5 w. This is because the operating impedance changes with a decrease in the bias voltage.
Efficiency versus frequency characteristic curve when it is because it becomes slightly mismatched at f 0.
【００１０】ここで、送信回路が１ｗの電力を出力する
時、出力電圧切り替えスイッチ１１は１ｗ時バイアス電
圧１２側に接続され、送信電力増幅器３に１ｗ時用バイ
アス電圧が供給される。これと同時に、送信電力増幅器
３の出力端に接続された可変容量素子１５にも電圧が供
給される。図４では効率対周波数特性曲線の最大値が規
定周波ｆ0 よりも高い領域に存在しているが、可変容量
素子１５が大容量であることにより、効率対周波数特性
曲線の最大点が規定周波数ｆ0 に近づき効率が増加す
る。一方、送信回路が５ｗの電力を出力する時、出力電
力切り替えスイッチ１１は５ｗ時バイアス電圧１３側に
接続され、送信電力増幅器３に５ｗ時用バイアス電圧が
供給される。これと同時に、可変容量素子１５にも５ｗ
時用バイアス電圧が供給される。ここで、可変容量素子
１５は微少容量を示し、効率対周波数特性曲線にはほぼ
影響を与えないため、規定の周波数ｆ0 において、この
曲線は最大値を示す。このようにして、送信出力電力を
切り替えても電源効率を最大限に上げることができる。
尚、可変容量素子の接続箇所は、上記の部位だけとは限
らない。また、可変容量素子を可変誘導素子に置き換え
ても同様である。Here, when the transmitting circuit outputs 1 w of power, the output voltage switch 11 is connected to the 1 w of the bias voltage 12 side, and the 1 w of the bias voltage is supplied to the transmission power amplifier 3. At the same time, a voltage is also supplied to the variable capacitance element 15 connected to the output terminal of the transmission power amplifier 3. In FIG. 4, the maximum value of the efficiency versus frequency characteristic curve exists in a region higher than the specified frequency f 0 , but the maximum point of the efficiency versus frequency characteristic curve is It approaches f 0 and the efficiency increases. On the other hand, when the transmitting circuit outputs 5 w power, the output power switch 11 is connected to the 5 w bias voltage 13 side, and the 5 w bias voltage is supplied to the transmission power amplifier 3. At the same time, 5 w
A time bias voltage is supplied. Here, since the variable capacitance element 15 has a very small capacitance and has almost no effect on the efficiency versus frequency characteristic curve, this curve shows the maximum value at the specified frequency f 0 . In this way, the power efficiency can be maximized even if the transmission output power is switched.
Note that the connection locations of the variable capacitance elements are not limited to the above-described locations. The same is true even when the variable capacitance element is replaced with a variable inductive element.
【００１１】[0011]
【発明の効果】以上説明したように本発明によれば、送
信出力電力を切り替えて使用する通信機において、低出
力電力設定時は低出力時に適した整合回路、高出力電力
設定時は高出力時に適した整合回路となるように構成し
たため、出力する電力値によって異なるインピーダンス
に対しても、最適な整合回路を実現できる。さらに、周
波数や送信方式が同じであれば、いかなる送信電力であ
ろうとも最大限に電源効率を上げることができる通信機
を実現することが可能になる。特に、電池を電源とする
携帯型通信機器においては、動作時間を延長させる効果
も得られる。As described above, according to the present invention, in a communication device that switches and uses transmission output power, a matching circuit suitable for low output when low output power is set, and high output when high output power is set. Since the configuration is such that the matching circuit is sometimes suitable, an optimum matching circuit can be realized even for impedances that vary depending on the output power value. Furthermore, if the frequency and the transmission method are the same, it is possible to realize a communication device capable of maximizing the power efficiency regardless of the transmission power. In particular, in a portable communication device using a battery as a power source, an effect of extending the operation time can be obtained.
【図１】本発明の一実施例の構成を示すブロック図。FIG. 1 is a block diagram showing the configuration of an embodiment of the present invention.
【図２】従来の通信機の構成例を示すブロック図。FIG. 2 is a block diagram showing a configuration example of a conventional communication device.
【図３】本発明の一実施例における電力増幅器の効率対
バイアス電圧特性を示す図。FIG. 3 is a diagram showing efficiency versus bias voltage characteristics of a power amplifier according to one embodiment of the present invention.
【図４】本発明の一実施例における電力増幅器の効率対
周波数特性を示す図。FIG. 4 is a diagram showing efficiency versus frequency characteristics of a power amplifier according to one embodiment of the present invention.
【図５】本発明の一実施例における可変容量素子の容量
対印加電圧特性を示す図。FIG. 5 is a diagram showing a capacitance-applied voltage characteristic of a variable capacitance element according to one embodiment of the present invention.
１：電圧制御発振器、 ２：送信緩衝増
幅器、３：送信電力増幅器、 ４：送／
受切り替えスイッチ、５：低域通過帯域フィルタ、
６：アンテナ、７：結合器、
８：検波器、９：比較器、
１０：基準電圧、１１：出力電力切り替えスイッ
チ、 １２：１ｗ時バイアス電圧、１３：５ｗ時バイ
アス電圧、 １４：ＣＰＵ、１５：可変容量素
子。1: voltage controlled oscillator 2: transmission buffer amplifier 3: transmission power amplifier 4: transmission /
Receiving switch 5, 5: low pass band filter,
6: antenna, 7: coupler,
8: detector, 9: comparator,
10: Reference voltage, 11: Output power switch, 12: 1 w bias voltage, 13: 5 w bias voltage, 14: CPU, 15: Variable capacitance element.
Claims (3)
機において、 設定した送信出力電力に対応してインピーダンスを整合
せしめる補償手段を具備することにより、最適な電源効
率を得られるように構成したことを特徴とする通信機。1. A communication device which switches and uses transmission output power, comprising a compensating means for matching impedance in accordance with a set transmission output power, so as to obtain optimum power supply efficiency. A communication device characterized by the above-mentioned.
量素子から成ることを特徴とする通信機。2. The communication device according to claim 1, wherein the compensating means for matching the impedance comprises a variable capacitance element.
を特徴とする通信機。3. The communication device according to claim 1, wherein the communication device comprises a portable wireless device powered by a battery.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP10363898A JP2000188556A (en) | 1998-12-22 | 1998-12-22 | Communication equipment |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP10363898A JP2000188556A (en) | 1998-12-22 | 1998-12-22 | Communication equipment |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JP2000188556A true JP2000188556A (en) | 2000-07-04 |
Family
ID=18480468
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP10363898A Pending JP2000188556A (en) | 1998-12-22 | 1998-12-22 | Communication equipment |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2000188556A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2012169532A (en) * | 2011-02-16 | 2012-09-06 | Seiko Epson Corp | Integrated circuit device and electronic apparatus |
-
1998
- 1998-12-22 JP JP10363898A patent/JP2000188556A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2012169532A (en) * | 2011-02-16 | 2012-09-06 | Seiko Epson Corp | Integrated circuit device and electronic apparatus |
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