JPS59185417A - Bus coupler - Google Patents
Bus couplerInfo
- Publication number
- JPS59185417A JPS59185417A JP5952783A JP5952783A JPS59185417A JP S59185417 A JPS59185417 A JP S59185417A JP 5952783 A JP5952783 A JP 5952783A JP 5952783 A JP5952783 A JP 5952783A JP S59185417 A JPS59185417 A JP S59185417A
- Authority
- JP
- Japan
- Prior art keywords
- coupler
- transceiver
- line
- characteristic impedance
- inductance
- 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
Classifications
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03H—IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS
- H03H7/00—Multiple-port networks comprising only passive electrical elements as network components
- H03H7/38—Impedance-matching networks
Landscapes
- Small-Scale Networks (AREA)
Abstract
Description
【発明の詳細な説明】
本発明は回路容量の許容量を大きくしたバス結合器に関
する。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a bus coupler with a large allowable circuit capacity.
伝送線路(同軸ケーブルが多い)1本を複数の機器で共
有するデータウェイは広く普及しておp1第1図にその
構成例を示す。図はリニア形のデータウェイを示してい
る。図において、D1〜Dn(nは整数、以下同じ)は
機器、T1〜Tnはトランシーバ(ステーション)、A
1〜Anは結合器、DBは伝送線路(データウェイ)で
ある。各機器り、〜DnとデータウェイDBの結合はバ
ス結合器A1〜Anによって行われ、トランシーバT1
〜Tnによって論理レベルに変換される。従来のこの種
のシステムでに、各結合部における入力インピーダンス
が低いという問題があった。伝送線路は、本来特性イン
ピーダンスで整合終端し、て使用されるものであり、途
中に有限のインピーダンスが接続されると反射を引き起
こし伝送に悪影響を及ばず。データウェイの場合、その
接続数が多数となるため影響も大きい。Dataways, in which a single transmission line (often a coaxial cable) is shared by multiple devices, are widely used, and an example of their configuration is shown in Figure 1 of page 1. The figure shows a linear dataway. In the figure, D1 to Dn (n is an integer, the same applies hereinafter) are devices, T1 to Tn are transceivers (stations), and A
1 to An are couplers, and DB is a transmission line (data way). The coupling between each device ~Dn and the dataway DB is performed by bus couplers A1~An, and the transceiver T1
~Tn is converted to logic level. Conventional systems of this type have a problem in that the input impedance at each coupling part is low. Transmission lines are originally used with matching terminations at characteristic impedances, and if a finite impedance is connected along the way, reflections will occur and transmission will not be adversely affected. In the case of data ways, the number of connections is large, so the impact is large.
このような不具合を無くすために現在一般的に行われて
いる方法は、負荷のインピータンスを可能な限シ大きく
してデータウェイに影響を与えないようにすることであ
る。このため、入力抵抗を上げ結合部及び回路の容量を
できるだけ減らす工夫がされている4、第2図はバス結
合器の構成例を示す図でるり、結合部の容量を減らすた
め同軸ケーブル外皮に穴をあけ針(ニードル)で中心導
体と結合している。このようにして、回路部に許容され
る客層は数PFと小さくすることができる。図において
、1は同軸ケープ“ル、2は結合器である。A currently common method for eliminating such problems is to increase the impedance of the load as much as possible so as not to affect the data way. For this reason, measures have been taken to increase the input resistance and reduce the capacitance of the coupling section and circuit as much as possible.4 Figure 2 shows an example of the configuration of a bus coupler. It is connected to the center conductor with a hole and a needle. In this way, the number of customers allowed for the circuit section can be reduced to a few PF. In the figure, 1 is a coaxial cable and 2 is a coupler.
ケーブル1を結合器2の溝3にはめ込み、両側からかし
める。m 5図はケーブルとニードルとの接触部の構成
を示す図である。クー−プル1の内部構成は、誘電体1
1、芯線導体12、シールド13及び外皮14よりなる
。Slはニードルと芯線導体12との接触点、S2.S
6はンールド線の接触点でらる。図中のRは等価接触抵
抗、Cは容量、Llは信号線、t2はアース線である。Fit the cable 1 into the groove 3 of the coupler 2 and caulk from both sides. Figure m5 is a diagram showing the structure of the contact portion between the cable and the needle. The internal structure of the couple 1 is as follows: dielectric material 1
1. Consists of a core conductor 12, a shield 13, and an outer sheath 14. Sl is the contact point between the needle and the core conductor 12, S2. S
6 comes from the contact point of the rolled wire. In the figure, R is an equivalent contact resistance, C is a capacitance, Ll is a signal line, and t2 is a ground line.
従来のこの踵の結合器は点接触なので信頼性が低く、廿
たトランス絶縁が困難等回路部の構成が限定されるとい
う不具合を有してい凱。Conventional heel couplers are point-contact, so they have low reliability, and have drawbacks such as difficulty in insulating the transformer and limiting the configuration of the circuit section.
本発明はこのような点に鑑みてなされたものであって、
線路側からみた/<ス結合器の特性インヒ“−ダンスを
線路の特性インピーダンスより高く構成し、トランシー
バ接続時に(結合器+トランシーバ)として線路の%性
インピーダンスと整合がとれるようにして、回路容量の
許容量を大さくできる結合器を実現したものである。The present invention has been made in view of these points, and
The characteristic impedance of the coupler as viewed from the line side is configured to be higher than the characteristic impedance of the line, and when the transceiver is connected, it is possible to match the characteristic impedance of the line as a coupler + transceiver, and the circuit capacitance is This realizes a coupler that can increase the tolerance.
以下、図面を参照して本発明の詳細な説明する。Hereinafter, the present invention will be described in detail with reference to the drawings.
本発明を説明する前に、従来例の「反射」の理由を解析
する。第4図(a)は結合器の構成を、(1))はその
等価回路を示している。l−ツンンーバの入力回路(げ
、積分器も含めて抵抗分R1,容量分C1で表わすこと
ができる。、高い周波数では容量分C2たけ考慮すれは
よい。(Cの影響が大きくなるから)一方、線路及びコ
ネクタは特性イノビーダンス(高周波では抵抗)Roに
整合している。線路には図に示すように分布容清C6と
インダクタンスし。がちり、特性インピーダンスR6と
の関係は次式で与えられる。Before explaining the present invention, the reason for "reflection" in the conventional example will be analyzed. FIG. 4(a) shows the configuration of the coupler, and FIG. 4(1)) shows its equivalent circuit. The input circuit of the l-tunba (including the integrator) can be expressed as a resistance component R1 and a capacitance component C1. At high frequencies, it is good to consider the capacitance component C2. (The influence of C becomes large) On the other hand , the line and the connector are matched to the characteristic innovidance (resistance at high frequencies) Ro.The line has a distributed volume C6 and inductance as shown in the figure.The relationship between the dust and the characteristic impedance R6 is given by the following equation. .
Cン石=1え。 (1)コネクタでも機
械曲りな成(寸法)を調整して特性インピーダンスをR
8に合わせている。このような系に結合器、トランシー
バを結合すると抵抗分R8と容量分C9とが並列接続埒
れるので、この部分の特性インピーダンスがR6からず
れて(小さくなり)不整合となる。C stone = 1. (1) Adjust the mechanical bending (dimensions) of the connector to adjust the characteristic impedance R.
It is set to 8. When a coupler and a transceiver are coupled to such a system, the resistance component R8 and the capacitance component C9 are connected in parallel, so that the characteristic impedance of this portion deviates (becomes smaller) from R6, resulting in a mismatch.
上述のように、線路、コネクタを含む結合器の特性イン
ピーダンスをできるたけ線路特性インピーダンスに合わ
せておき、挿入するトランシーバの容量をできるだけ小
さく抑えて整合がずれないようにするのが従来の方法で
あり、限界がある。。As mentioned above, the conventional method is to match the characteristic impedance of the coupler, including the line and connector, to the line characteristic impedance as much as possible, and to keep the capacitance of the inserted transceiver as small as possible to avoid mismatching. ,There is a limit. .
そこで、結合器の特性インピーダンスを予め線路の特性
インピーダンスR6より大きくしておき、トランシーバ
を接続した時点ではじめて結合器のトランシーバのイン
ピーダンスの合成値が線路からみた特性インピーダンス
R9に等しくなるようにすることによりCIに対する許
容度の大きい結合器が構成できることになる。Therefore, the characteristic impedance of the coupler should be made larger than the characteristic impedance R6 of the line in advance, so that the combined value of the impedance of the coupler's transceiver becomes equal to the characteristic impedance R9 seen from the line only when the transceiver is connected. This makes it possible to construct a coupler with a high tolerance for CI.
第5図は、本発明に係る結合器を用いた結合部の等価回
路である。LoとC8はそれぞれ線路のインイご−
ダクタンス、キャパシタで$9.L、C,rはそれぞれ
結合器のインダクタンス、キャパシタンス回路である。FIG. 5 is an equivalent circuit of a coupling section using a coupler according to the present invention. Lo and C8 are the inductance and capacitor of the line, respectively, each costing $9. L, C, and r are the inductance and capacitance circuits of the coupler, respectively.
具体的手段としては、(1)式よりわかるように、トラ
ンシーバを接続することによる容量分の増加を、インダ
クタンスLをその分だけ犬きくしておくことにより補償
している。バス結合器のインターフタンスL yx L
> I、oの範囲で適切に選きる。また、トランシー
バの抵抗分Rに対しても結合器の抵抗分子を適切に選定
するとR6に整合することができる。Specifically, as can be seen from equation (1), the increase in capacity due to the connection of the transceiver is compensated for by increasing the inductance L by that amount. Interftance of bus coupler L yx L
> Choose appropriately within the range of I and o. Furthermore, if the resistor molecule of the coupler is appropriately selected, it is possible to match R6 with respect to the resistance R of the transceiver.
第6図は実際の結合器の構成を示す図である。FIG. 6 is a diagram showing the configuration of an actual coupler.
トランシーバとのm H部にインダクタ21.22とキ
ャパシタ23を予め取付けておく。これら素子で(in
成される特性インピーダンスの値シj1、前述したよう
に線路特性インピーダンスより予め大きくしておく。イ
ンダクタ21.22のインダクタンスは、nHオーダで
十分なため、第7図に示すようにパターンでインダクタ
ンスを実現してもよい1、第8図は、本考案に係る結合
器の他の実施例を示す構成図である。図で24はプリン
ト板、25ハトラ7ン一バ入力回路、26け結合部であ
る。図より明らかなように、プリント板の両面で結合器
を構成している。Inductors 21, 22 and capacitor 23 are attached in advance to the mH portion with the transceiver. With these elements (in
The value of the characteristic impedance shi j1 formed by the line is set in advance to be larger than the line characteristic impedance, as described above. Since the inductance of the inductors 21 and 22 is sufficient on the order of nH, the inductance may be realized by a pattern as shown in FIG. 7. FIG. 8 shows another embodiment of the coupler according to the present invention. FIG. In the figure, 24 is a printed board, 25 is an input circuit for a 7-channel amplifier, and 26 is a coupling section. As is clear from the figure, the coupler is constructed on both sides of the printed board.
パターン幅Wやプリント板厚さt等で現定される特性イ
ンピーダンスをR6よシも大きくとることができる/(
図のA部)。−1だ、回路結合部Bについても同様の考
え方が適用できる。本発明によれば、回路部(トランシ
ーバ)を含めて整合がとられているため反射を抑えるこ
とができる。トランシーバを外している時は逆に不整合
となるが、このような状態は保守点検時のみ生じるだけ
であるので問題はない。また、入力容−頃の許容値が増
えランシーバと結合器の接続部も容量が許されるため、
ニードル等によらない例えばコネクタ等による確実な接
続ができるようになる。The characteristic impedance defined by the pattern width W, printed board thickness t, etc. can be made larger than R6/(
(Part A of the figure). -1, the same idea can be applied to the circuit coupling part B. According to the present invention, since matching is achieved including the circuit section (transceiver), reflection can be suppressed. On the other hand, when the transceiver is removed, there will be a mismatch, but this is not a problem because such a situation only occurs during maintenance and inspection. In addition, the allowable value of the input capacitance increases, and the capacitance of the connection between the transceiver and coupler is also allowed.
Reliable connection can be made using a connector or the like instead of using a needle or the like.
以上詳細に説明したように、本発明によれば線路側から
みた結合器の特性インピーダンスを線路の・特性インピ
ーダンスと整合がとれるようにして、回路容量の許容針
を大きくできるバス結合器を実現することができる。As explained in detail above, according to the present invention, the characteristic impedance of the coupler seen from the line side can be matched with the characteristic impedance of the line, thereby realizing a bus coupler that can increase the allowable needle of circuit capacitance. be able to.
第1図はデータウェイの構成を示す図、第2図は結合器
の構成を示す図、第6図は結合器とニードルとの接触部
の構成を示す図、第4図(a)は結合器の構成を示す図
、<b)はその等価回路図、第5図は本発明による結合
部の等価回路図、第6図は本発明の一構成を示す電気回
路図、第7図はプリント板のパターン図、第8図は本発
明の他の実施例を示す構成図である。
D−D・・機器、T −T ・トランシーバ、A1〜A
n1 n 1 n・
・・バス結合器、DB・・伝送線路、1・・ケーブル、
2・・・結合器、3・・・溝、11・・−誘電体、12
・・・芯線、13・・・ンールド、14・・・外皮、R
,・・抵抗分、C4容駐分、12゜22・・・インダク
タ、23・・・キャパ/り。
第 11乙
扉 21刀
第 3 )利
暦 41で
に1
(θ、)
t
(b)Figure 1 is a diagram showing the configuration of the dataway, Figure 2 is a diagram showing the configuration of the coupler, Figure 6 is a diagram showing the configuration of the contact part between the coupler and the needle, and Figure 4 (a) is a diagram showing the configuration of the coupler. Figure 5 is an equivalent circuit diagram of the coupling part according to the present invention, Figure 6 is an electric circuit diagram showing one configuration of the present invention, and Figure 7 is a printed circuit diagram. The plate pattern diagram, FIG. 8, is a configuration diagram showing another embodiment of the present invention. D-D...Equipment, T-T Transceiver, A1-A
n1 n 1 n・
・・Bus coupler, DB・・Transmission line, 1・・Cable,
2...Coupler, 3...Groove, 11...-dielectric, 12
... core wire, 13 ... rolled, 14 ... outer cover, R
,...Resistance, C4 capacity, 12゜22...Inductor, 23...Capacitor/R. 11th Otsutobi 21st sword 3rd) Riyaku 41 deni 1 (θ,) t (b)
Claims (1)
ーバ)結合用接続手段を有するデータウェイ結合器であ
って、線路側からみた結合器の特性インピーダンスを線
路の特性インピーダンスよシ高くシ、トランシーバ接続
時にトランシーバと結合器の合成インピーダンスが線路
の特性インピーダンスと整合がとれるようにしたことを
特徴とするバス結合器。This dataway coupler has a connector for coupling to a transmission line and a connection means for coupling to a station (transceiver), the characteristic impedance of the coupler as seen from the line side is higher than the characteristic impedance of the line, and the characteristic impedance of the coupler is higher than the characteristic impedance of the line, and when the transceiver is connected, A bus coupler characterized in that the composite impedance of the coupler is matched with the characteristic impedance of a line.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP5952783A JPS59185417A (en) | 1983-04-05 | 1983-04-05 | Bus coupler |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP5952783A JPS59185417A (en) | 1983-04-05 | 1983-04-05 | Bus coupler |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS59185417A true JPS59185417A (en) | 1984-10-22 |
Family
ID=13115832
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP5952783A Pending JPS59185417A (en) | 1983-04-05 | 1983-04-05 | Bus coupler |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS59185417A (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH01130636A (en) * | 1987-10-30 | 1989-05-23 | Internatl Business Mach Corp <Ibm> | Apparatas for termination of transmission line |
Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5287934A (en) * | 1976-01-19 | 1977-07-22 | Fujitsu Ltd | Bus transmission route |
JPS5528616A (en) * | 1978-08-21 | 1980-02-29 | Fujitsu Ltd | Drive system for transmission line |
-
1983
- 1983-04-05 JP JP5952783A patent/JPS59185417A/en active Pending
Patent Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5287934A (en) * | 1976-01-19 | 1977-07-22 | Fujitsu Ltd | Bus transmission route |
JPS5528616A (en) * | 1978-08-21 | 1980-02-29 | Fujitsu Ltd | Drive system for transmission line |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH01130636A (en) * | 1987-10-30 | 1989-05-23 | Internatl Business Mach Corp <Ibm> | Apparatas for termination of transmission line |
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