JPH0210612B2 - - Google Patents
Info
- Publication number
- JPH0210612B2 JPH0210612B2 JP21378683A JP21378683A JPH0210612B2 JP H0210612 B2 JPH0210612 B2 JP H0210612B2 JP 21378683 A JP21378683 A JP 21378683A JP 21378683 A JP21378683 A JP 21378683A JP H0210612 B2 JPH0210612 B2 JP H0210612B2
- Authority
- JP
- Japan
- Prior art keywords
- signal
- signal transmission
- transmission path
- filter
- frequency bandwidth
- 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.)
- Expired
Links
- 230000008054 signal transmission Effects 0.000 claims description 28
- 230000008878 coupling Effects 0.000 claims description 6
- 238000010168 coupling process Methods 0.000 claims description 6
- 238000005859 coupling reaction Methods 0.000 claims description 6
- 238000010586 diagram Methods 0.000 description 4
- 230000005540 biological transmission Effects 0.000 description 1
- 238000000034 method Methods 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B3/00—Line transmission systems
- H04B3/02—Details
- H04B3/03—Hybrid circuits
Landscapes
- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Cable Transmission Systems, Equalization Of Radio And Reduction Of Echo (AREA)
Description
【発明の詳細な説明】
〔発明の属する技術分野〕
本発明は、周波数帯域幅が異なる２つの信号を
相互に結合する信号結合回路に関する。特に、２
つの信号の相互干渉を少なくした信号結合回路に
関する。DETAILED DESCRIPTION OF THE INVENTION [Field of the Invention] The present invention relates to a signal coupling circuit that mutually couples two signals having different frequency bandwidths. In particular, 2
The present invention relates to a signal coupling circuit that reduces mutual interference between two signals.
〔従来技術の説明〕
周波数多重される通信装置では、占有する周波
数帯域幅が異なる二つの信号を結合する信号結合
回路（ハイブリツド回路）が広く用いられる。第
１図はこのための従来例回路であつて、端子Ａに
は第２図Ａに示す信号が入力して、ハイブリツド
回路１に接続され、端子Ｂには第２図Ｂに示す信
号が入力して変成器２を介してハイブリツド回路
１に接続され、端子Ｃには第２図Ｃに示す信号が
出力される。この各端子が接続された信号伝送路
の特性インピーダンスが等しいときには、ハイブ
リツド回路１は第１図に示すような抵抗ハイブリ
ツド回路で、通過する信号が3dBの損失で結合さ
れる。[Description of Prior Art] In frequency multiplexed communication devices, signal combining circuits (hybrid circuits) that combine two signals occupying different frequency bandwidths are widely used. Figure 1 shows a conventional circuit for this purpose, in which the signal shown in Figure 2A is input to terminal A and connected to the hybrid circuit 1, and the signal shown in Figure 2B is input to terminal B. It is connected to the hybrid circuit 1 via the transformer 2, and the signal shown in FIG. 2C is outputted to the terminal C. When the characteristic impedances of the signal transmission paths to which these terminals are connected are equal, the hybrid circuit 1 is a resistive hybrid circuit as shown in FIG. 1, and passing signals are coupled with a loss of 3 dB.
ところが、各端子に接続される信号伝送路の特
性インピーダンスは、その信号の周波数帯域幅に
ついては比較的に正しく整合するが、その信号周
波数帯域幅以外の帯域では、信号伝送路のインピ
ーダンスが特性インピーダンスとは大きく異なる
場合が多い。このような状態で第１図に示す回路
で信号を結合すると、第２図Ｃに示す結合された
信号は信号Ａまたは信号Ｂの振幅および位相が、
第２図ＡまたはＢの信号とは異なることになる。 However, although the characteristic impedance of the signal transmission path connected to each terminal is relatively accurately matched for the frequency bandwidth of the signal, in bands other than the signal frequency bandwidth, the impedance of the signal transmission path matches the characteristic impedance. is often very different. If the signals are combined in the circuit shown in FIG. 1 in this state, the combined signal shown in FIG. 2C will be such that the amplitude and phase of signal A or signal B are
This will be different from the signal in FIG. 2A or B.
これを回避するために、従来回路では、各信号
伝送路に正しい特性インピーダンスの抵抗減衰器
を挿入する等の方法が採られているが、これでは
信号に損失が生じるので効率的な信号伝送ができ
ない。 To avoid this, conventional circuits employ methods such as inserting a resistive attenuator with the correct characteristic impedance in each signal transmission path, but this causes loss in the signal and does not allow efficient signal transmission. Can not.
本発明はこれを改良するもので、結合する信号
に損失がなく、しかも信号周波数帯域幅以外の周
波数の特性インピーダンスが正しくない場合に
も、結合された信号に大きい変化を与えることが
ない信号結合回路を提供することを目的とする。
The present invention improves this, and provides signal coupling that does not cause a large change in the combined signals even when the signals to be combined have no loss and the characteristic impedance of frequencies other than the signal frequency bandwidth is incorrect. The purpose is to provide circuits.
本発明は、一方の信号伝送路は抵抗器で結合
し、他方の信号伝送路には、その信号伝送路の信
号周波数帯域を通過する濾波器と上記一方の信号
伝送路の信号周波数帯域を通過する濾波器とを並
列接続し、その信号伝送路の信号周波数帯域幅を
通過する濾波器から信号を取り出し、上記一方の
信号伝送路の信号周波数帯域幅を通過する濾波器
は特性インピーダンスに近似するインピーダンス
により終端することを特徴とする。
In the present invention, one signal transmission path is coupled by a resistor, and the other signal transmission path includes a filter that passes the signal frequency band of the signal transmission path, and a filter that passes the signal frequency band of the one signal transmission path. A filter is connected in parallel with a filter that passes the signal frequency bandwidth of the signal transmission path, and a signal is extracted from the filter that passes the signal frequency bandwidth of one of the signal transmission paths.The filter that passes the signal frequency bandwidth of one of the signal transmission paths approximates the characteristic impedance. It is characterized by termination by impedance.
第３図は本発明実施例回路の構成図である。端
子Ａに接続される第一の信号伝送路は、増幅器３
および抵抗器４を介してハイブリツド回路１に接
続される。端子Ｂに接続される第二の信号伝送路
は変成器２を介して、さらにこの第二の信号伝送
路の信号Ｂを通過帯域とする濾波器５を介して、
ハイブリツド回路１に接続される。この濾波器５
には並列に、第一の信号伝送路の信号Ａを通過帯
域とする濾波器６が接続され、この濾波器６には
特性インピーダンスに近似する終端抵抗器７が接
続される。
FIG. 3 is a block diagram of a circuit according to an embodiment of the present invention. The first signal transmission path connected to terminal A is connected to amplifier 3.
and is connected to the hybrid circuit 1 via a resistor 4. The second signal transmission line connected to terminal B is passed through a transformer 2, and further through a filter 5 whose passband is the signal B of this second signal transmission line.
Connected to the hybrid circuit 1. This filter 5
A filter 6 whose pass band is the signal A of the first signal transmission path is connected in parallel to the filter 6, and a terminating resistor 7 having a characteristic impedance approximated to the filter 6 is connected to the filter 6.
このように構成すると、第２図に示す信号Ａの
周波数帯域では、ハイブリツド回路１の各端子に
ついては、端子Ａはその信号周波数帯域であるの
で信号伝送路のインピーダンスは特性インピーダ
ンスに近似している。端子Ｂの方向では、信号Ａ
の周波数帯域では濾波器６が通過帯域であり、終
端抵抗器７が有効であつて特性インピーダンスに
近似した値である。また、第２図に示す信号Ｂの
周波数帯域では、ハイブリツド回路１の端子Ｂの
方向には、濾波器５が有効であり、端子Ｂに接続
されるこの信号Ｂの周波数帯域の正しい特性イン
ピーダンスが見える。端子Ａの方向には、この帯
域ではかりに伝送路のインピーダンスが特性イン
ピーダンスと相違していても、低抗器４が接続さ
れているので、このその影響は緩和される。した
がつて、ハイブリツド回路１の各方向のインピー
ダンス特性は、いずれも特性インピーダンスに近
い値になり、結合回路を通過することにより、信
号の振幅および位相が変化することを避けること
ができる。 With this configuration, in the frequency band of signal A shown in FIG. 2, for each terminal of the hybrid circuit 1, since terminal A is in the signal frequency band, the impedance of the signal transmission path approximates the characteristic impedance. . In the direction of terminal B, signal A
In the frequency band, the filter 6 is a passband, the terminating resistor 7 is effective, and has a value close to the characteristic impedance. Furthermore, in the frequency band of signal B shown in FIG. appear. Even if the impedance of the transmission line differs from the characteristic impedance in this band in the direction of the terminal A, since the low resistor 4 is connected, this influence is alleviated. Therefore, the impedance characteristics in each direction of the hybrid circuit 1 have values close to the characteristic impedance, and the amplitude and phase of the signal can be prevented from changing by passing through the coupling circuit.
第３図に示すように、抵抗器４を接続する端子
には増幅器３を接続して、そのレベルを補償する
ことが望ましい。 As shown in FIG. 3, it is desirable to connect an amplifier 3 to the terminal to which the resistor 4 is connected to compensate for its level.
上記実施例では、増幅器３を使用して端子Ａお
よびＢが入力端子であり、端子Ｃが出力端子であ
る例を説明したが、増幅器３は必ずしも必要でな
く、また増幅器３の方向はどのような向きでもよ
く、端子Ｃの結合された信号側が入力とすること
もできる。 In the above embodiment, the amplifier 3 is used, and the terminals A and B are input terminals, and the terminal C is the output terminal. However, the amplifier 3 is not necessarily necessary, and the direction of the amplifier 3 may be changed. It may be in any direction, and the coupled signal side of terminal C may be used as an input.
以上説明したように、本発明によれば、簡単な
回路構成で全周波数帯域幅にわたり、各信号伝送
路のインピーダンスの値が特性インピーダンスに
近似することになり、結合回路を通過することに
より、信号に変化が生じることがない優れた回路
を得ることができる。
As explained above, according to the present invention, the impedance value of each signal transmission path approximates the characteristic impedance over the entire frequency bandwidth with a simple circuit configuration. It is possible to obtain an excellent circuit in which no change occurs in the circuit.
第１図は従来例回路の構成図。第２図は二つの
信号の周波数帯域幅を説明する図。第３図は本発
明実施例回路の構成図。
１……ハイブリツド回路、２……変成器、３…
…増幅器、４……抵抗器、５，６……濾波器、７
……終端抵抗器。
FIG. 1 is a configuration diagram of a conventional circuit. FIG. 2 is a diagram explaining the frequency bandwidths of two signals. FIG. 3 is a configuration diagram of a circuit according to an embodiment of the present invention. 1...hybrid circuit, 2...transformer, 3...
...Amplifier, 4...Resistor, 5, 6...Filter, 7
...Terminal resistor.
Claims (1)
の信号伝送路と、 上記第一の周波数帯域幅とは異なる第二の周波
数帯域幅の信号が伝送される第二の信号伝送路
と、 上記第一の信号伝送路の信号と上記第二の信号
伝送路の信号とが結合された第三の信号伝送路
と、 上記三つの信号伝送路を相互に結合するハイブ
リツド回路と、 を含む信号結合回路において、 上記第一の信号伝送路は抵抗結合され、 上記第二の信号伝送路には上記第一の周波数帯
域幅の信号を選択的に通過させる第一の濾波器お
よび上記第二の周波数帯域幅の信号を選択的に通
過させる第二の濾波器とが並列に接続され、 上記第一の濾波器の一端が特性インピーダンス
に近似するインピーダンスで終端されたことを特
徴とする信号結合回路。[Claims] 1. A first signal transmission path through which a signal with a first frequency bandwidth is transmitted, and a second signal transmission path through which a signal with a second frequency bandwidth different from the first frequency bandwidth is transmitted. a second signal transmission path; a third signal transmission path in which the signal of the first signal transmission path and the signal of the second signal transmission path are combined; and the three signal transmission paths are mutually coupled. In the signal coupling circuit including a hybrid circuit, the first signal transmission path is resistively coupled, and the second signal transmission path has a first signal transmission path that selectively passes the signal of the first frequency bandwidth. The filter and a second filter that selectively passes the signal of the second frequency bandwidth are connected in parallel, and one end of the first filter is terminated with an impedance that approximates the characteristic impedance. A signal coupling circuit featuring:
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP21378683A JPS60105331A (en) | 1983-11-14 | 1983-11-14 | Signal coupling circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP21378683A JPS60105331A (en) | 1983-11-14 | 1983-11-14 | Signal coupling circuit |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS60105331A JPS60105331A (en) | 1985-06-10 |
| JPH0210612B2 true JPH0210612B2 (en) | 1990-03-08 |
Family
ID=16645020
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP21378683A Granted JPS60105331A (en) | 1983-11-14 | 1983-11-14 | Signal coupling circuit |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS60105331A (en) |
-
1983
- 1983-11-14 JP JP21378683A patent/JPS60105331A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS60105331A (en) | 1985-06-10 |
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