JPS6070372A - Electric field intensity detecting circuit - Google Patents
Electric field intensity detecting circuitInfo
- Publication number
- JPS6070372A JPS6070372A JP17972583A JP17972583A JPS6070372A JP S6070372 A JPS6070372 A JP S6070372A JP 17972583 A JP17972583 A JP 17972583A JP 17972583 A JP17972583 A JP 17972583A JP S6070372 A JPS6070372 A JP S6070372A
- Authority
- JP
- Japan
- Prior art keywords
- electric field
- field strength
- output
- signal
- logarithmic amplifier
- 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
Links
Abstract
Description
【発明の詳細な説明】
（１）発明の技術分野
本発明は移動無線通信等にお＆Ｊる電界強度検出回路に
係り、特に、対数増幅器を用いた電界強度検山回ｌｌ′
３に関する。DETAILED DESCRIPTION OF THE INVENTION (1) Technical Field of the Invention The present invention relates to a field strength detection circuit used in mobile radio communications, etc., and particularly relates to a field strength detection circuit using a logarithmic amplifier.
Regarding 3.
（２）技術の背景
ｌ１１（線通信において受信の際の電界強度を検出Ｊる
ことが必要なｊ↓１合がある。例えば自動車電話等０）
Ｊ多’ＪｉＩ＋無線通ｈ”＋てＬ；ｌ： Ｊ、（他局と
移動局間の距離に応し７（電！／ｉ！強度は大きく変化
するため、電界が（：、１弱な場合は通信回線を他の基
地局に切替え、電界が強過ぎる場合は送信出力を低下さ
せるなどの対応が必要である。これらの理由により、微
弱な電界から強大な電界まで検出できる、ダイナミック
レンジの広い電界強度検出回路が望まれている。(2) Technical background l11 (In line communication, there are cases in which it is necessary to detect the electric field strength during reception. For example, car telephones, etc.)
J multi'JiI+wireless communication h"+teL;l: J, (Depending on the distance between the other station and the mobile station, 7(electric!/i! strength changes greatly, so the electric field is (:, 1 weak) If the electric field is too strong, it is necessary to take measures such as switching the communication line to another base station and reducing the transmission output if the electric field is too strong. A wide field strength detection circuit is desired.
（３）従来技術と問題点
第１図は従来の電界強度検出回路のブロック構成図であ
る。(3) Prior Art and Problems FIG. 1 is a block diagram of a conventional electric field strength detection circuit.
同図において、１はアンテナ、２は第１ミキザ。In the figure, 1 is an antenna, and 2 is a first mixer.
５は第２ミキサ、３および６は発振回路、４および７は
；ｌｊ域濾波器、８は５段からなるり１数１１！１幅器
。5 is a second mixer, 3 and 6 are oscillation circuits, 4 and 7 are LJ band pass filters, and 8 is a 111!1 width filter consisting of five stages.
９は信号−合成回路である。9 is a signal-synthesizing circuit.
Ｏ１ｊ記−１ンデナ１から入力された信号は、前記第１
および第２ミキジ°により中間周波数に変換され前記り
Ｉ数増幅器８へ入力される。対数増幅器は出力が入力の
り１数で表わされるため、入力が大きく変動する（Ｎ
ｑを検出するのに通している。前記り１数州幅器８は人
力された信号を増幅して復調回路へ出力するとともに、
各段から前記信冗合成回路９へ出力」°る。前記信５シ
合成回路！ｌ Ｌ；ｌ前記り１数増幅器８の各段からの
信号を合成し、電界強度検出出力として出力する。The signal input from O1j-1 Ndena 1 is
The signal is then converted into an intermediate frequency by the second mixer and inputted to the I-number amplifier 8. Since the output of a logarithmic amplifier is expressed by the number of inputs, the input fluctuates greatly (N
It is passed through to detect q. The above-mentioned multi-channel amplifier 8 amplifies the manually input signal and outputs it to the demodulation circuit.
The signal is outputted from each stage to the signal/redundancy combining circuit 9. Said signal 5 synthesis circuit! l L; Signals from each stage of the one or more amplifiers 8 are combined and output as an electric field strength detection output.
そして、さらに検出のグイナミソクレンジを広（する場
合は、従来は対数増幅器の段数を増やしていた。To further widen the detection range, conventionally the number of logarithmic amplifier stages was increased.
しかしながら、前記第１ミキザ２および第２ミ・Ｆ号５
において、受信感度を良くするため線形増幅器を内蔵し
信号を増幅しているので、電界強度が強くなり過ぎると
前記りＩ数増幅器８の出力が高くなり過ぎて飽和してし
まい、このような強電界に′１５シｊる電界強度検出は
できなくなる。However, the first mixer 2 and the second mixer No. 5
In order to improve reception sensitivity, a linear amplifier is built in to amplify the signal, so if the electric field strength becomes too strong, the output of the I-number amplifier 8 will become too high and become saturated. Detection of electric field strength becomes impossible when the electric field exceeds 15 degrees.
このため、ある段数以上の場合は単に段数を増やすたり
では前記強電界におりる電界強度検出のグイナミソクレ
ンシを広げられなくなる。そして、前記強電界において
も電界を検出ずろためには回路を複雑にしなりれはなら
なかった。For this reason, if the number of stages is more than a certain level, it is not possible to widen the accuracy of electric field strength detection in the strong electric field by simply increasing the number of stages. Even in the case of a strong electric field, the circuit has to be complicated in order to detect the electric field incorrectly.
（４）発明の１」的
本発明しり１ト記従来の欠点を除去し筒中な改良によっ
゛（、りＩ数増幅器の出力が飽和−」る電界強度におい
ても電界強度を検出できる電界強度検出回路を提供する
ことを目的とする。(4) Summary of the present invention (1) By eliminating the conventional drawbacks and making thorough improvements, the electric field strength is such that the electric field strength can be detected even at an electric field strength where the output of the I-number amplifier is saturated. The purpose is to provide a detection circuit.
（５）発明の構成
本発明によれば、上記目的は、対数増幅器を備えた電界
強度検出回路において、前記対数増幅器へ入力される信
号を分岐させる分岐路と、前記対数増幅器の出力とを合
成する回路を具備し、電界強度検出出力を得ることを特
徴とする電界強度検出回路を提供することにより達成で
きる。(5) Structure of the Invention According to the present invention, the above object is to combine a branch path for branching a signal input to the logarithmic amplifier and an output of the logarithmic amplifier in an electric field strength detection circuit equipped with a logarithmic amplifier. This can be achieved by providing an electric field strength detection circuit characterized by comprising a circuit for detecting electric field strength and obtaining an electric field strength detection output.
（６）発明の実施例
第２図は本発明による電界強度検出回路の実施例のブロ
ック構成図であり、第３図（ａ）は従来の実施例、即ち
対数増幅器のめによる電界強度検出特性図であり、第３
図（ｂ）は本発明の実施例、即ち、線形増幅器による電
界強度検出特性改善効果図である。(6) Embodiment of the invention FIG. 2 is a block diagram of an embodiment of the electric field strength detection circuit according to the present invention, and FIG. Figure 3.
Figure (b) is a diagram illustrating the improvement of electric field strength detection characteristics by an embodiment of the present invention, that is, a linear amplifier.
第２図において、■はアンテナ（ΔＮ”Ｆ）、２は第１
ミキザ（１ｓ ｔＭＩＸ）、５ば第２ミキサ（２ｎｄＭ
ＩＸ）、３および６は発振回路（Ｏ２０）、４および７
は帯域濾波器（１３１）Ｆ） 、８は５段からなる対数
増幅器（ｌｏｇ−ΔＭＰ）、９は信司合成回路、１０は
抵抗ＲおよびコンデンサＣからなる信号分岐路である。In Figure 2, ■ is the antenna (ΔN”F), 2 is the first
Mixer (1s tMIX), 5th floor 2nd mixer (2ndM
IX), 3 and 6 are oscillation circuits (O20), 4 and 7
8 is a logarithmic amplifier (log-ΔMP) consisting of five stages, 9 is a Shinji synthesis circuit, and 10 is a signal branching path consisting of a resistor R and a capacitor C.
前記第１ミキザ２および前記第２ミキサ５はそれぞれ発
振回路３および６の信号と入力信号を合成し、アンチ〜
Ｊ−１で受信した高周波信号を中間周波数（例えば４５
５ｋｌｌｚ）に変換するとともに受信感度を良くするた
め線形に増幅する。前記帯域濾波器４および７はそれぞ
れ前記第１および第２のミキサからの出力のうち必要な
周波数の信号を抽出する。前記対数増幅器８は前記帯域
ｄ波器７からの倍量を入力し、入力された信号と対数の
関係になる倍量を前記合成回路９および復調回路へ出力
する。前記信号分岐Ｉ？３１０は前記対数増幅器８への
入力信司を分岐さ一已て入力し、前記倍量合成回路９へ
出力する。前記信兄合成回路９では前記倍量分岐路１０
を通ってきた信号と、前記り１もり増幅器８の各段から
の出力とを合成し、電界強度検出出力とし７て出力する
。The first mixer 2 and the second mixer 5 combine the signals of the oscillation circuits 3 and 6 with the input signal, and
The high frequency signal received by J-1 is converted to an intermediate frequency (e.g. 45
5kllz) and linearly amplified to improve reception sensitivity. The bandpass filters 4 and 7 extract signals of necessary frequencies from the outputs from the first and second mixers, respectively. The logarithmic amplifier 8 inputs the double amount from the band d-wave generator 7, and outputs the double amount having a logarithmic relationship with the input signal to the synthesis circuit 9 and the demodulation circuit. Said signal branch I? 310 branches the input signal to the logarithmic amplifier 8, inputs it once, and outputs it to the double amount combining circuit 9. The double branching path 10
The signal passed through the amplifier 8 and the output from each stage of the amplifier 8 are combined and outputted as an electric field strength detection output 7.
前記電界強度検出回路に、前記文・Ｉ数増幅器８か飽和
しない程度の電界強度の電波が入力された場合は、従来
の回路と同程度の検出出刃を得るが、前記対数増幅器８
が飽和する程強い電界強度の電波が入力された場合は、
前記対数増幅器８への、電界強度と線形な関係の入力が
前記信号分岐路１０（Ｒ−Ｃ）を通して前記対数増幅器
８の出方と合成されるため、前記ＲおよびＣの値を適当
に選ぶことにより、第３図ｔｂ＋のように前記対数増幅
器８が飽和しても前記第２ミキザ５にある線形増幅器が
飽和するまで、電界強度が線形に検出できる。When a radio wave having an electric field strength that does not saturate the signal amplifier 8 is input to the electric field strength detection circuit, a detection edge of the same level as a conventional circuit is obtained, but the logarithmic amplifier 8
If a radio wave with an electric field strength strong enough to saturate is input,
Since the input to the logarithmic amplifier 8 having a linear relationship with the electric field strength is combined with the output of the logarithmic amplifier 8 through the signal branch 10 (R-C), the values of R and C are appropriately selected. As a result, even if the logarithmic amplifier 8 is saturated as shown in FIG. 3 tb+, the electric field strength can be linearly detected until the linear amplifier in the second mixer 5 is saturated.
よる簡単な改良により電界強度検出回路のダイナミック
レンジ、特に強電界におりるダイナミックレンジが広が
り、対数増幅器が飽和する強電界のレベルにおいても電
界強度を検出てきるという効果がある。This simple improvement has the effect of widening the dynamic range of the electric field strength detection circuit, especially the dynamic range down to strong electric fields, and making it possible to detect the electric field strength even at strong electric field levels where the logarithmic amplifier is saturated.
第１図は従来の】異強度検出回路のプロ、り構成図、第
２図は本発明による電界強度検出回路のブロック構成図
、第３図は従来の電界強度検出回路と本発明による電界
強度検出回路の電界強度検出特性を示゛４−図である。
図面におい−Ｃ１１はアンテナ、２は第■ミキザ。
５は第２ミキリ′、８は対数増幅器、９は信号合成回路
、１０は信号分岐路（Ｒ−Ｃ） 、 （８＋は従来の特
性、（ｂ）は本発明による特性を示す。Fig. 1 is a block diagram of a conventional different strength detection circuit, Fig. 2 is a block diagram of a field strength detection circuit according to the present invention, and Fig. 3 is a block diagram of a conventional electric field strength detection circuit and an electric field strength according to the present invention. FIG. 4 shows the electric field strength detection characteristics of the detection circuit. In the drawing, C11 is the antenna, and 2 is the No. 1 mixer. 5 is a second mirror, 8 is a logarithmic amplifier, 9 is a signal synthesis circuit, 10 is a signal branch (R-C), (8+ shows the conventional characteristic, and (b) shows the characteristic according to the present invention.
Claims (1)
数増幅器へ入力される信号を分岐さ−ｌる分岐路と、前
記分岐路からの信号と前記対数増幅器の出力とを合成′
４°る信男合成回路とを具備し、電界強度蒋笹検出出力
を得ることを特徴とする電界強度検出回路。In an electric field strength detection circuit equipped with a logarithmic amplifier, a branch path that branches a signal input to the logarithmic amplifier, and a signal from the branch path and an output of the logarithmic amplifier are combined.
An electric field strength detection circuit comprising a 4° Nobuo synthesis circuit and obtaining an electric field strength detection output.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP17972583A JPS6070372A (en) | 1983-09-28 | 1983-09-28 | Electric field intensity detecting circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP17972583A JPS6070372A (en) | 1983-09-28 | 1983-09-28 | Electric field intensity detecting circuit |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS6070372A true JPS6070372A (en) | 1985-04-22 |
| JPH0475468B2 JPH0475468B2 (en) | 1992-11-30 |
Family
ID=16070776
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP17972583A Granted JPS6070372A (en) | 1983-09-28 | 1983-09-28 | Electric field intensity detecting circuit |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS6070372A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5689814A (en) * | 1993-08-20 | 1997-11-18 | Hitachi, Ltd. | Radio communication apparatus with expanded dynamic range |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5325441U (en) * | 1976-08-07 | 1978-03-03 | ||
| JPS58127175A (en) * | 1982-01-25 | 1983-07-28 | Hitachi Ltd | Electric field intensity detection circuit |
-
1983
- 1983-09-28 JP JP17972583A patent/JPS6070372A/en active Granted
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5325441U (en) * | 1976-08-07 | 1978-03-03 | ||
| JPS58127175A (en) * | 1982-01-25 | 1983-07-28 | Hitachi Ltd | Electric field intensity detection circuit |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5689814A (en) * | 1993-08-20 | 1997-11-18 | Hitachi, Ltd. | Radio communication apparatus with expanded dynamic range |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0475468B2 (en) | 1992-11-30 |
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