JP2001257617A - Impedance detection circuit for communication unit - Google Patents

Impedance detection circuit for communication unit

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Publication number
JP2001257617A
JP2001257617A JP2000065308A JP2000065308A JP2001257617A JP 2001257617 A JP2001257617 A JP 2001257617A JP 2000065308 A JP2000065308 A JP 2000065308A JP 2000065308 A JP2000065308 A JP 2000065308A JP 2001257617 A JP2001257617 A JP 2001257617A
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JP
Japan
Prior art keywords
voltage
impedance
detection
current
resistor
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.)
Granted
Application number
JP2000065308A
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Japanese (ja)
Other versions
JP3572239B2 (en
Inventor
Takeshi Sato
剛 佐藤
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.)
Japan Radio Co Ltd
Original Assignee
Japan Radio Co Ltd
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Priority to JP2000065308A priority Critical patent/JP3572239B2/en
Publication of JP2001257617A publication Critical patent/JP2001257617A/en
Application granted granted Critical
Publication of JP3572239B2 publication Critical patent/JP3572239B2/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Abstract

PROBLEM TO BE SOLVED: To enhance the communication efficiency of a communication unit. SOLUTION: The impedance detection circuit 40 for the communication unit is provided with a voltage detection section 42 and a current detection section 44. The voltage detection section 42 is provided with a resistor Ra, a capacitor C and a resistor Rb connected in series between a main connection line 46 and ground in this connection sequence from the main connection line 46 to the ground, and a voltage between the ground and a connecting point of the capacitor C and the resistor Rb connected to the ground is used for a detection voltage VE. Furthermore, the current detection section 44 has a current transformer 48 whose primary winding is the main connection line 46. A resistor R2 is connected in parallel with a secondary winding of the current transformer 48 and a voltage VI across the resistor R2 is detected. Configuring each circuit component to make an imaginary component of the detected voltage VE equal to an imaginary component of the voltage VI can cancel the imaginary component included in the detected voltage VI and causing an error with the imaginary component included in the detected voltage VE.

Description

【発明の詳細な説明】DETAILED DESCRIPTION OF THE INVENTION

【0001】[0001]

【発明の属する技術分野】本発明は、無線通信機用のイ
ンピーダンス検出回路に関し、特に、インピーダンス整
合のためのインピーダンス検出回路に関する。
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an impedance detection circuit for a radio communication device, and more particularly to an impedance detection circuit for impedance matching.

【0002】[0002]

【従来の技術】従来より、無線通信システムにおいて
は、信号の送受信効率の向上のためインピーダンスを整
合する整合器が設けられ、このインピーダンスの整合の
ためにインピーダンス検出回路が設けられている。例え
ば、従来より、無線送信システムには、送信出力を最大
にするために、空中線例えばアンテナ側のインピーダン
スを送信機側のインピーダンスに整合する整合器が設け
られ、この整合のために、信号の電圧および電流を検出
して送信機の出力側のインピーダンスを求める回路が備
えられる。図3には、従来の無線送信システムを示すブ
ロック図を、また図4には、このシステムに備えられる
従来のインピーダンス検出回路を、それぞれ示す。
2. Description of the Related Art Conventionally, a radio communication system has been provided with a matching device for matching impedance for improving signal transmission / reception efficiency, and an impedance detection circuit for matching this impedance. For example, conventionally, a radio transmission system is provided with a matching device that matches the impedance of an antenna, for example, an antenna, to the impedance of a transmitter in order to maximize the transmission output. And a circuit for detecting the current to determine the impedance on the output side of the transmitter. FIG. 3 is a block diagram showing a conventional wireless transmission system, and FIG. 4 shows a conventional impedance detection circuit provided in the system.

【0003】図3に示す無線送信システム1は、送信機
10と空中線70例えばアンテナとの間に、電力増幅部
20と整合器30とを備える。送信機10で生成された
送信信号は電力増幅部20で増幅され、整合器30を経
由して空中線70から送信される。整合器30はインピ
ーダンス検出回路40、制御部50、および整合部60
を有する。制御部50は、インピーダンス検出回路40
において検出されたインピーダンスに基づいて整合部6
0を制御し、整合部60は空中線70のインピーダンス
を送信機側のインピーダンス(例えば規定インピーダン
ス:50Ω)に変換する。なお、インピーダンス検出回
路40は実際には、信号電圧Eの抵抗分圧VEと、カレ
ントトランス48両端の電圧Vi(即ち信号電流Iと相
対的な電流値)とを検出し、これらに基づいてインピー
ダンスが算出される。
The radio transmission system 1 shown in FIG. 3 includes a power amplifier 20 and a matching unit 30 between a transmitter 10 and an antenna 70 such as an antenna. The transmission signal generated by the transmitter 10 is amplified by the power amplifier 20 and transmitted from the antenna 70 via the matching unit 30. The matching unit 30 includes an impedance detection circuit 40, a control unit 50, and a matching unit 60.
Having. The control unit 50 controls the impedance detection circuit 40
Matching section 6 based on the impedance detected in
0, the matching unit 60 converts the impedance of the antenna 70 into the impedance on the transmitter side (for example, a specified impedance: 50Ω). Actually, the impedance detection circuit 40 detects the resistance partial pressure V E of the signal voltage E, and a current transformer 48 the voltage across V i (i.e. the signal current I and relative current value), based on these The impedance is calculated.

【0004】インピーダンス検出回路40は、図3にも
示すように、送信機10と空中線70との間の送信ライ
ンに対して直列に介装される。即ち、インピーダンス検
出回路40の入力端子inと出力端子outとを結ぶ主
接続線46は、送信ラインの一部を成す。出力端子ou
tにはインピーダンスの検出を行う対象となる整合部6
0が、また入力端子inには調整目標とするインピーダ
ンス(例えば規定インピーダンス:50Ω)を有する装
置例えば送信機10が、それぞれ接続される。この検出
回路40は、電圧検出部42と電流検出部44とを備え
る。このうち電圧検出部42は、主接続線46と接地と
の間に直列に二つの抵抗RaとRbとを備え、この二つの
抵抗Ra、Rbの中間点と接地との間の電位差VEを検出
電圧VEとして検出する。また電流検出部44は、主接
続線46を1次巻線とするカレントトランス48を有す
る。そして、このカレントトランス48の2次巻線と並
列に例えば一端を接地した抵抗R2を備え、この抵抗R2
の両端の電位差Vi(以下単に電圧Viとする)を検出す
る。この検出回路40において検出される電圧VE、Vi
はそれぞれ、
[0004] As shown in FIG. 3, the impedance detection circuit 40 is interposed in series with a transmission line between the transmitter 10 and the antenna 70. That is, the main connection line 46 connecting the input terminal in and the output terminal out of the impedance detection circuit 40 forms a part of the transmission line. Output terminal ou
In t, a matching unit 6 to be subjected to impedance detection
0 is connected to the input terminal in, and a device having a target impedance (for example, a specified impedance: 50Ω), for example, the transmitter 10 is connected to the input terminal in. The detection circuit 40 includes a voltage detection unit 42 and a current detection unit 44. Among them, the voltage detection unit 42 includes two resistors Ra and Rb in series between the main connection line 46 and the ground, and a voltage between an intermediate point between the two resistors Ra and Rb and the ground. detecting the potential difference V E as the detection voltage V E. Further, the current detecting section 44 has a current transformer 48 having the main connection line 46 as a primary winding. Then, comprising a resistor R 2 that is grounded in parallel, for example one secondary winding of the current transformer 48, the resistance R 2
Detecting the ends of the electric potential difference V i (simply referred to as a voltage V i below). The voltages V E and V i detected by the detection circuit 40
Respectively

【数1】 (Equation 1)

【数2】 (ここに、Ra,Rb,R2:各抵抗の抵抗値、j:虚
数、E:送信信号電圧、I:送信信号電流、ω:送信信
号角周波数、M:カレントトランスの相互インダクタン
ス、L2:カレントトランスの2次巻線インダクタン
ス、N:カレントトランスの2次巻線の巻数、Z0:規
定インピーダンス(例えば50Ω))となる。これらの
式(1)、(2)より送信信号電圧Eおよび送信信号電
流Iを求めることができる。この際、インピーダンス検
出回路40の出力端子outに規定インピーダンスを接
続したとき、電圧検出部における検出電圧VEと電流検
出部における検出電圧Viとが一致するよう、各要素の
特性値即ち回路定数を設定する。即ち、
(Equation 2) (Where, R a , R b , R 2 : resistance value of each resistor, j: imaginary number, E: transmission signal voltage, I: transmission signal current, ω: transmission signal angular frequency, M: mutual inductance of current transformer, L2 is the secondary winding inductance of the current transformer, N is the number of turns of the secondary winding of the current transformer, and Z 0 is a specified impedance (for example, 50Ω). From these equations (1) and (2), the transmission signal voltage E and the transmission signal current I can be obtained. At this time, when a specified impedance is connected to the output terminal out of the impedance detection circuit 40, the characteristic value of each element, that is, the circuit constant, is set so that the detection voltage V E in the voltage detection unit matches the detection voltage V i in the current detection unit. Set. That is,

【数3】 (Equation 3)

【数4】 を満たすよう、各要素を設定する。ここで式(4)は、
抵抗R2をωL2より十分小さくすること(R2<<ωL
2)により満足される。この式(4)の左辺(即ち虚数
部分)は正確に1とすることができないため、インピー
ダンス検出に関する誤差成分となる。
(Equation 4) Set each element to satisfy Here, equation (4) is
Make the resistance R 2 sufficiently smaller than ωL2 (R 2 << ωL
2 ) is satisfied. Since the left side (that is, the imaginary part) of the equation (4) cannot be exactly 1, it becomes an error component related to impedance detection.

【0005】[0005]

【発明が解決しようとする課題】このような構成では、
電流検出部44における検出電圧Viの検出レベルを大
きくするために、式(2)におけるR2/(NZ0)を大
きくしようとすると、抵抗R2を増大させるか、または
巻数Nを減少させる必要があるが、これら抵抗R2の増
大あるいは巻数Nの減少により、ωが小さい場合(即ち
周波数が低い場合)式(4)の左辺中の値がωL2/R2
減少し、検出電圧Viの誤差が増大する場合がある。即
ち、電流検出部44における検出電圧Viは、高い検出
レベルで精度良く検出すること、即ち検出レベルの向上
と検出精度の向上との両立が難しいという問題があっ
た。
In such a configuration,
To increase R 2 / (NZ 0 ) in equation (2) in order to increase the detection level of the detection voltage V i in the current detection unit 44, the resistance R 2 is increased or the number of turns N is reduced. However, when the resistance R2 is increased or the number of turns N is decreased, when ω is small (that is, when the frequency is low), the value on the left side of the equation (4) is ωL 2 / R 2
Reduced, there is a case where the error of the detected voltage V i increases. That is, the detection voltage V i at the current detection unit 44, to be accurately detected at a high detection level, that is, compatibility between improvement in detection level improve the detection accuracy of is difficult.

【0006】[0006]

【課題を解決するための手段】上記課題に鑑み、本発明
のインピーダンス検出回路は、電圧を検出する電圧検出
部と、電流を検出するカレントトランスとを備え、電圧
検出部は、カレントトランスにより検出した電流の虚数
部分を相殺する虚数部分を前記分圧回路に容量成分を追
加することを特徴とする。
SUMMARY OF THE INVENTION In view of the above problems, an impedance detection circuit according to the present invention includes a voltage detection unit for detecting a voltage and a current transformer for detecting a current, and the voltage detection unit detects the current by the current transformer. An imaginary part for canceling the imaginary part of the current is added with a capacitance component to the voltage dividing circuit.

【0007】このような構成によれば、電流検出部によ
り検出した電流の虚数部分、即ちカレントトランスによ
り生じる誤差要因を相殺し、検出誤差を増大させること
なく検出電圧のレベルを増大することが可能となるた
め、送信ラインのインピーダンス検出の精度をより向上
させることができる。
According to such a configuration, it is possible to cancel the imaginary part of the current detected by the current detector, that is, the error factor generated by the current transformer, and increase the level of the detection voltage without increasing the detection error. Therefore, the accuracy of impedance detection of the transmission line can be further improved.

【0008】また本発明のインピーダンス検出回路の電
圧検出部は、分圧を生じる抵抗の間に直列にコンデンサ
を備える。
Further, the voltage detecting section of the impedance detecting circuit according to the present invention includes a capacitor in series between resistors for generating a voltage division.

【0009】また本発明のインピーダンス検出回路の電
圧検出部は、信号電圧を分圧する二つのコンデンサを直
列に備え、これらコンデンサの間と接地との間に抵抗を
備える。
The voltage detecting section of the impedance detecting circuit according to the present invention includes two capacitors in series for dividing a signal voltage, and a resistor between the capacitors and the ground.

【0010】これらの構成によれば、検出電圧VEに、
カレントトランスにより生じる虚数部分を相殺する虚数
部分を含めることができ、誤差要因を相殺し、送信ライ
ンのインピーダンス検出の精度をより向上することがで
きる。
According to these configurations, the detection voltage V E
An imaginary part for canceling an imaginary part generated by the current transformer can be included, so that error factors can be canceled and the accuracy of impedance detection of the transmission line can be further improved.

【0011】[0011]

【発明の実施の形態】以下、本発明にかかるインピーダ
ンス検出回路を無線送信システムの整合器用のインピー
ダンス検出回路に適用した本発明の第一の実施の形態に
ついて図面を参照しながら説明する。図1は本実施形態
のインピーダンス検出回路の回路図である。なお本実施
形態において、無線送信システムの構成および電流検出
部44の回路構成は、従来のもの(即ち図4に示したも
の)と全く同様とすることができるため、ここでの詳細
な説明を省略する。電圧検出部42は、主接続線46
(即ち送信ライン)と接地との間に抵抗Rb、コンデン
サC、および抵抗Raを、接地から主接続線46に向か
ってこの順に直列に備え、接地側の抵抗Rbとコンデン
サCとの間の電圧を抵抗分圧VEとして検出する。この
ような構成によれば、検出電圧VEは、
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a first embodiment of the present invention in which an impedance detecting circuit according to the present invention is applied to an impedance detecting circuit for a matching device of a radio transmission system will be described with reference to the drawings. FIG. 1 is a circuit diagram of the impedance detection circuit of the present embodiment. In the present embodiment, the configuration of the wireless transmission system and the circuit configuration of the current detection unit 44 can be exactly the same as the conventional configuration (that is, the configuration shown in FIG. 4). Omitted. The voltage detection unit 42 includes a main connection line 46
(I.e., transmission line) resistor R b between the ground and the capacitor C, and resistor R a, provided in series in this order toward the main connecting line 46 from the ground, the ground-side resistor R b and the capacitor C detecting the voltage between the voltage divider V E. According to such a configuration, the detection voltage VE is

【数5】 (ここに、Ra,Rb:抵抗(Ra,Rb)の抵抗値、C:
コンデンサCの容量)となる。また、電流検出部におけ
る検出電圧Viは、前の式(2)と同様に、
(Equation 5) (Where, R a , R b : resistance values of resistors (R a , R b ), C:
(Capacity of the capacitor C). Further, the detection voltage Vi in the current detection unit is calculated in the same manner as in the above equation (2).

【数6】 となる。これらの式から整合部60側のインピーダンス
を検出するために、VE=Viとするためには、
(Equation 6) Becomes To detect V E = V i in order to detect the impedance on the matching unit 60 side from these equations,

【数7】 と、(Equation 7) When,

【数8】 (Equation 8)

【数9】 とをともに満たすよう、各要素の特性値即ち回路定数
(例えば各抵抗値(Ra,Rb,R2)、コンデンサ容量
C、2次巻線インダクタンスL2)を設定して構成すれ
ばよい。これら式(3)および(7)の導出から明らか
なように、図1に示す電圧検出部42の構成によれば、
電圧検出部42における検出電圧VEに対し、検出電圧
iに含まれる虚数部分(即ち式(6)の左辺)を相殺
する虚数部分(即ち式(6)の右辺)を含めることがで
きる。即ちこれは、電圧検出部42に、検出電流Vi
虚数部分を相殺する虚数部分を検出電圧VEに生じさせ
る回路定数を有する容量成分を設けたと言うことができ
る。このような構成により、電流検出部44の検出電圧
iに生じる誤差要因となる虚数部分を相殺することが
できるため、検出誤差を増大させることなく検出電圧の
レベルを増大することが可能となり、送信ラインのイン
ピーダンス検出の精度をより向上させることができる。
(Equation 9) In order to satisfy both, the characteristic value of each element, that is, the circuit constant (for example, each resistance value (R a , R b , R 2 ), capacitor capacitance C, secondary winding inductance L 2 ) may be set. . As is apparent from the derivation of the equations (3) and (7), according to the configuration of the voltage detection unit 42 shown in FIG.
To detect the voltage V E of the voltage detection unit 42 may include a imaginary part to offset the imaginary portion included in the detected voltage V i (i.e. the left-hand side of equation (6)) (i.e., the right side of the equation (6)). That this is the voltage detector 42, can be said to have provided a capacitive component having a circuit constant causing imaginary part to offset the imaginary part of the detected current V i to the detection voltage V E. With such a configuration, an imaginary part which causes an error in the detection voltage V i of the current detection unit 44 can be offset, so that the level of the detection voltage can be increased without increasing the detection error, The accuracy of impedance detection of the transmission line can be further improved.

【0012】次に、本発明にかかるインピーダンス検出
回路を無線送信システムの整合器用のインピーダンス検
出回路に適用した本発明の第二の実施の形態について図
面を参照しながら説明する。図2には本実施形態のイン
ピーダンス検出回路の電圧検出部の回路図である。本実
施形態における電圧検出部42は、前述した本発明の第
一の実施形態と実質的に等価な回路構成を備える。なお
本実施形態においても、無線送信システムの構成および
電流検出部44の回路構成は、従来のもの(即ち図4に
示したもの)と全く同様とすることができるため、ここ
での詳細な説明を省略する。電圧検出部42は、主接続
線46(即ち送信ライン)と接地との間に二つのコンデ
ンサCbおよびCaを接地側から主接続線46側に向かっ
てこの順に直列に備え、さらにこれら二つのコンデンサ
(Ca,Cb)間の点と接地との間に抵抗R1を備え、前
記二つのコンデンサ(Ca,Cb)間の電圧を検出する。
このような構成によれば、検出電圧VEは、
Next, a second embodiment of the present invention in which the impedance detecting circuit according to the present invention is applied to an impedance detecting circuit for a matching device of a wireless transmission system will be described with reference to the drawings. FIG. 2 is a circuit diagram of a voltage detection unit of the impedance detection circuit according to the present embodiment. The voltage detection unit 42 in the present embodiment has a circuit configuration substantially equivalent to that of the above-described first embodiment of the present invention. Also in the present embodiment, the configuration of the wireless transmission system and the circuit configuration of the current detection unit 44 can be exactly the same as the conventional one (that is, the one shown in FIG. 4). Is omitted. Voltage detector 42, main connection line 46 (i.e., transmission line) toward the main connection line 46 side two capacitors C b and C a the ground between the ground provided in series in this order, further these two One of the capacitor (C a, C b) comprising a resistor R 1 between the point and the ground between the two capacitors (C a, C b) detecting the voltage between.
According to such a configuration, the detection voltage VE is

【数10】 (ここに、Ca,Cb:コンデンサ(Ca,Cb)の容量、
1:抵抗R1の抵抗値)となる。また、電流検出部44
における検出電圧Viは、前の式(2)と同様に、
(Equation 10) (Where, C a , C b : capacitance of capacitors (C a , C b ),
R 1 : resistance value of the resistor R 1 ). Also, the current detection unit 44
Is the detection voltage V i in the same manner as in the previous equation (2).

【数11】 となる。これらの式から送信ラインのインピーダンスを
検出するために、VE=Viとするためには、
[Equation 11] Becomes In order to detect the impedance of the transmission line from these equations, in order to set V E = V i ,

【数12】 と、(Equation 12) When,

【数13】 (Equation 13)

【数14】 とをともに満たすよう、各要素の特性値即ち回路定数
(例えば各容量(Ca,Cb)、抵抗値R1、2次巻線イ
ンダクタンスL2)を設定して構成すればよい。これら
式(3)および(10)の導出から明らかなように、図
2に示す電圧検出部42の構成によれば、電圧検出部4
2における検出電圧VEに対し、検出電圧Viに含まれる
虚数部分(即ち式(9)の左辺)を相殺する虚数部分
(即ち式(9)の右辺)を含めることができる。即ちこ
れは、電圧検出部42に、検出電流Viの虚数部分を相
殺する虚数部分を検出電圧VEに生じさせる回路定数を
有する抵抗成分を設けたと言うことができる。このよう
な構成により、電流検出部44の検出電圧Viに生じる
誤差要因となる虚数部分を相殺することができるため、
検出誤差を増大させることなく検出電圧のレベルを増大
することが可能となり、送信ラインのインピーダンス検
出の精度をより向上させることができる。
[Equation 14] May be configured by setting the characteristic value of each element, that is, the circuit constant (for example, each capacitance (C a , C b ), the resistance value R 1 , and the secondary winding inductance L 2 ). As is apparent from the derivation of the equations (3) and (10), according to the configuration of the voltage detection unit 42 shown in FIG.
To detect the voltage V E at 2, may be included imaginary part to offset the imaginary portion included in the detected voltage V i (i.e. the left-hand side of equation (9)) (i.e., the right side of the equation (9)). That this is the voltage detector 42, can be said to provide a resistance component having a circuit constant causing imaginary part to offset the imaginary part of the detected current V i to the detection voltage V E. With such a configuration, an imaginary part which causes an error in the detection voltage V i of the current detection unit 44 can be canceled out.
The level of the detection voltage can be increased without increasing the detection error, and the accuracy of impedance detection of the transmission line can be further improved.

【0013】なお、本発明は前述した実施形態には限ら
れない。特に電圧検出部は、前述した実施形態以外のも
のであっても、カレントトランスにより検出した電流の
虚数部分を相殺する虚数部分を前記抵抗分圧に生じる回
路定数を有する容量成分を設けたものであればよい。
The present invention is not limited to the embodiment described above. In particular, even if the voltage detection unit is other than the above-described embodiment, a capacitance component having a circuit constant that causes the imaginary part of the current detected by the current transformer to cancel the imaginary part of the resistance is provided. I just need.

【0014】[0014]

【発明の効果】以上説明したように、本発明によれば、
電圧検出部における分圧回路に、カレントトランスによ
り検出電流の虚数部分を相殺する虚数部分を生じさせ、
即ちこれらの虚数部分が一致するよう回路要素を構成す
ることにより、検出誤差を増大することなく検出電圧の
レベルを増大することが可能となるため、検出レベルの
向上と検出精度の向上とを両立し、より精度良くインピ
ーダンスの整合を行い、通信効率を向上することが可能
となる。
As described above, according to the present invention,
In the voltage dividing circuit in the voltage detection unit, an imaginary part is generated by a current transformer to cancel the imaginary part of the detection current,
In other words, by configuring the circuit elements such that these imaginary parts match, it is possible to increase the level of the detection voltage without increasing the detection error, so that both the detection level and the detection accuracy can be improved. In addition, impedance matching can be performed more accurately, and communication efficiency can be improved.

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

【図1】 本発明の実施形態にかかるインピーダンス検
出回路の構成図である。
FIG. 1 is a configuration diagram of an impedance detection circuit according to an embodiment of the present invention.

【図2】 本発明の別の実施形態にかかるインピーダン
ス検出回路の構成図である。
FIG. 2 is a configuration diagram of an impedance detection circuit according to another embodiment of the present invention.

【図3】 無線送信システムの概略構成を示すブロック
図である。
FIG. 3 is a block diagram illustrating a schematic configuration of a wireless transmission system.

【図4】 従来のインピーダンス検出回路の構成図であ
る。
FIG. 4 is a configuration diagram of a conventional impedance detection circuit.

【符号の説明】[Explanation of symbols]

10 送信機、30 整合器、40 インピーダンス検
出回路、42 電圧検出部、44 電流検出部、48
カレントトランス、70 空中線。
Reference Signs List 10 transmitter, 30 matching unit, 40 impedance detection circuit, 42 voltage detection unit, 44 current detection unit, 48
Current transformer, 70 antenna.

───────────────────────────────────────────────────── フロントページの続き Fターム(参考) 2G028 AA01 AA05 BD05 BF05 CG08 DH01 FK09 MS03 5H410 BB08 CC03 DD03 EA16 EB14 EB38 FF03 FF05 FF09 FF25 5K011 DA02 DA12 EA06 JA01 KA13 5K060 BB00 CC04 DD03 DD04 HH00 JJ02 JJ04 JJ24 LL07  ──────────────────────────────────────────────────続 き Continued on the front page F term (reference) 2G028 AA01 AA05 BD05 BF05 CG08 DH01 FK09 MS03 5H410 BB08 CC03 DD03 EA16 EB14 EB38 FF03 FF05 FF09 FF25 5K011 DA02 DA12 EA06 JA01 KA13 5K060 BB00 JJ00 JJ04 DD03 DD04

Claims (3)

【特許請求の範囲】[Claims] 【請求項1】 通信信号の電圧を分圧して検出する電圧
検出部と、通信信号の電流を検出するカレントトランス
と、を備え、前記電圧検出部により検出した検出電圧と
前記カレントトランスにより検出した電流とから通信機
のインピーダンスを検出するインピーダンス検出回路で
あって、 前記電圧検出部は、前記カレントトランスにより検出し
た電流の虚数部分を相殺する虚数部分を前記分圧回路に
生じさせる回路定数を有する容量成分を設けたことを特
徴とする通信機用インピーダンス検出回路。
A voltage detecting unit that divides a voltage of the communication signal and detects the voltage; and a current transformer that detects a current of the communication signal, wherein the voltage detected by the voltage detecting unit is detected by the current transformer. An impedance detection circuit that detects an impedance of a communication device from a current and the voltage detection unit has a circuit constant that causes the voltage division circuit to generate an imaginary part that cancels an imaginary part of the current detected by the current transformer. An impedance detection circuit for a communication device, comprising a capacitance component.
【請求項2】 前記電圧検出部は、信号電圧を分圧する
二つの抵抗の間に直列にコンデンサを備えることを特徴
とする請求項1に記載のインピーダンス検出回路。
2. The impedance detection circuit according to claim 1, wherein the voltage detection unit includes a capacitor in series between two resistors for dividing a signal voltage.
【請求項3】 前記電圧検出部は、信号電圧を分圧する
抵抗に替えて二つのコンデンサを直列に備え、これらコ
ンデンサの間と接地との間に抵抗を備えることを特徴と
する請求項1に記載のインピーダンス検出回路。
3. The voltage detection unit according to claim 1, wherein the voltage detection unit includes two capacitors in series in place of a resistor for dividing a signal voltage, and includes a resistor between the capacitors and a ground. The impedance detection circuit according to any one of the preceding claims.
JP2000065308A 2000-03-09 2000-03-09 Impedance detection circuit for communication equipment Expired - Lifetime JP3572239B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP2000065308A JP3572239B2 (en) 2000-03-09 2000-03-09 Impedance detection circuit for communication equipment

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP2000065308A JP3572239B2 (en) 2000-03-09 2000-03-09 Impedance detection circuit for communication equipment

Publications (2)

Publication Number Publication Date
JP2001257617A true JP2001257617A (en) 2001-09-21
JP3572239B2 JP3572239B2 (en) 2004-09-29

Family

ID=18584864

Family Applications (1)

Application Number Title Priority Date Filing Date
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Country Status (1)

Country Link
JP (1) JP3572239B2 (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2006061044A (en) * 2004-08-25 2006-03-09 Asahi Kasei Homes Kk Vegetation base
JP2008521319A (en) * 2004-11-19 2008-06-19 コーニンクレッカ フィリップス エレクトロニクス エヌ ヴィ Apparatus with control alignment stage
JP2012174087A (en) * 2011-02-23 2012-09-10 Nec Computertechno Ltd Power-supply device operation circuit

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2006061044A (en) * 2004-08-25 2006-03-09 Asahi Kasei Homes Kk Vegetation base
JP2008521319A (en) * 2004-11-19 2008-06-19 コーニンクレッカ フィリップス エレクトロニクス エヌ ヴィ Apparatus with control alignment stage
US8111111B2 (en) 2004-11-19 2012-02-07 Epcos Ag Device comprising a controlled matching stage
US8476986B2 (en) 2004-11-19 2013-07-02 Epcos Ag Device comprising a controlled matching stage
US8890636B2 (en) 2004-11-19 2014-11-18 Qualcomm Technologies, Inc. Device comprising a controlled matching stage
JP2012174087A (en) * 2011-02-23 2012-09-10 Nec Computertechno Ltd Power-supply device operation circuit

Also Published As

Publication number Publication date
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