JPH02111126A - Transmission circuit - Google Patents
Transmission circuitInfo
- Publication number
- JPH02111126A JPH02111126A JP26348688A JP26348688A JPH02111126A JP H02111126 A JPH02111126 A JP H02111126A JP 26348688 A JP26348688 A JP 26348688A JP 26348688 A JP26348688 A JP 26348688A JP H02111126 A JPH02111126 A JP H02111126A
- Authority
- JP
- Japan
- Prior art keywords
- signal
- transmission
- transmission cable
- output
- cable
- 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
- 230000005540 biological transmission Effects 0.000 title claims abstract description 51
- 230000015556 catabolic process Effects 0.000 claims 1
- 238000006731 degradation reaction Methods 0.000 claims 1
- 239000003990 capacitor Substances 0.000 abstract description 6
- 230000006866 deterioration Effects 0.000 abstract description 3
- 230000010354 integration Effects 0.000 abstract 2
- 238000010586 diagram Methods 0.000 description 5
- 230000002238 attenuated effect Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
- 239000013589 supplement Substances 0.000 description 1
Landscapes
- Dc Digital Transmission (AREA)
- Cable Transmission Systems, Equalization Of Radio And Reduction Of Echo (AREA)
- Reduction Or Emphasis Of Bandwidth Of Signals (AREA)
Abstract
Description
【発明の詳細な説明】
汰血光■
本発明は伝送回路に関し、特に一対の電気ケーブルを使
用する差動モード伝送に使用する伝送回路に関する。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a transmission circuit, and more particularly to a transmission circuit used for differential mode transmission using a pair of electric cables.
従来技術
従来この種の伝送回路には第３図に示されているように
２線の伝送ケーブル６が使用されていた。Prior Art Conventionally, this type of transmission circuit has used a two-wire transmission cable 6 as shown in FIG.
そして、通信データを差動モードに変換した後の電気信
号をドライバ１により各線に送出していた。After converting the communication data into differential mode, the driver 1 sends out electrical signals to each line.
さらに、伝送ケーブル６によって伝送されてくる差動モ
ードの電気信号をレシーバ７にて受信して通信データに
逆変換する事により、長距離、高速伝送を行っていた。Further, by receiving differential mode electrical signals transmitted by the transmission cable 6 at the receiver 7 and inversely converting them into communication data, long-distance, high-speed transmission was performed.
しかし、上述した従来の伝送回路においては、第４図に
示されているようにドライバ１からの差動出力信号の電
圧レベルが通常の方形波であるため、長距離の伝送ケー
ブル６を使用して信号を伝送した場合、伝送ケーブル６
の周波数特性により高周波成分の減衰が大きくなり、出
力信号がなまってしまう（信号の立上りと立下りとが遅
くなる）という欠点があった。つまり、結果的には伝送
ケーブル６によって信号が積分されていた。However, in the conventional transmission circuit described above, since the voltage level of the differential output signal from the driver 1 is a normal square wave as shown in FIG. 4, a long-distance transmission cable 6 is not used. If the signal is transmitted using the transmission cable 6
Due to the frequency characteristics, the attenuation of high frequency components becomes large, and the output signal becomes dull (the rise and fall of the signal becomes slow). In other words, as a result, the signal was integrated by the transmission cable 6.
そのなめ、レシーバ７で受信したデータに歪やジッタが
発生し、シリアルデータを正確に変換する事ができず、
いわゆるデータ化は等の通信エラーが発生ずる場合があ
るという欠点があった。As a result, distortion and jitter occur in the data received by the receiver 7, making it impossible to convert serial data accurately.
So-called data conversion has the disadvantage that communication errors such as the following may occur.
几匪五月濃
本発明の目的は、歪やジッタによる通信エラーの発生を
低減することができろ伝送回路を提供することである。SUMMARY OF THE INVENTION An object of the present invention is to provide a transmission circuit that can reduce the occurrence of communication errors due to distortion and jitter.
発明の楕叱
本発明の伝送回路は、送信器と受信器との間に設けられ
た積分特性を有する伝送路を含む伝送回路であって、前
記伝送路と前記送信器との間にこの伝送路の積分特性に
より生じる信号劣化を補償する微分特性を有する補償手
段を有することを特徴とする。Summary of the Invention The transmission circuit of the present invention is a transmission circuit including a transmission line having an integral characteristic provided between a transmitter and a receiver, the transmission circuit having an integral characteristic between the transmission line and the transmitter. The present invention is characterized in that it has a compensation means having a differential characteristic that compensates for signal deterioration caused by the integral characteristic of the path.
衷１ 以１・、図面を用いて本発明の詳細な説明する。Back 1 In the following, the present invention will be explained in detail using the drawings.
第１図は本発明による伝送回路の一実施例の構成を示す
ブロック図であり、第３図と同等部分は同一符号により
示されている７［Ａにおいて、第３図と異なる点はドラ
イバ］とケーブル６との間に送信等価回路８が設けられ
ている点である。FIG. 1 is a block diagram showing the configuration of an embodiment of a transmission circuit according to the present invention, and parts equivalent to those in FIG. 3 are indicated by the same symbols 7 [In A, the difference from FIG. 3 is the driver] The difference is that a transmission equivalent circuit 8 is provided between the cable 6 and the cable 6.
送信等価回路８はケーブル６内の２線に夫々対応して接
続された抵抗２及び３を有している。また、抵抗２，３
には夫々並列にコンデンサ４，５が接続されている。The transmission equivalent circuit 8 has resistors 2 and 3 connected to two wires in the cable 6, respectively. Also, resistors 2 and 3
Capacitors 4 and 5 are connected in parallel with each other.
ドライバ１は通信データを入力して差動モードの伝送信
号を出力するものであり、従来のドライバ（第３図参照
）より出力振幅が大きいものとする。The driver 1 inputs communication data and outputs a differential mode transmission signal, and has a larger output amplitude than a conventional driver (see FIG. 3).
抵抗２及び３はレシーバ７の入力インピーダンスとの分
圧によって伝送ケーブル６上でのドライバ１の出力電圧
の電圧レベルを従来のそれと同等に調整するためのもの
である。The resistors 2 and 3 are used to adjust the voltage level of the output voltage of the driver 1 on the transmission cable 6 to be equal to that of a conventional voltage by voltage division with the input impedance of the receiver 7.
コンデンサ４及び５はドライバ１の出Ｊ１の高周波成分
を出力するためのものて゛ある。こ！９．らコンデンサ
・１及びうめ値は第４［４に示さｆ＋ているような伝送
ケーブル６の信号の減衰特性を逆に補足できるような容
量値とする。Capacitors 4 and 5 are provided for outputting high frequency components of output J1 of driver 1. child! 9. The capacitor 1 and the fill value are set to capacitance values that can conversely supplement the signal attenuation characteristics of the transmission cable 6 as indicated by f+ in the fourth [4].
こうずれば伝送ケーブル６上で失なり）′１ろ周渡数成
分を予め信シ１に余分にｉへ加１〜でおく４゛′とがで
きるのである。１、たがって、出力波形は第２図に示さ
れているようになり、伝送ケーブル６の入力部分の信号
波形（送信等価回路８の出力信号）の立上り電圧が高く
なるのである。By doing this, it is possible to add 1 to 4' to the transmission cable 6 by adding the frequency component of 1 to i in advance to the transmission cable 6. 1. Therefore, the output waveform becomes as shown in FIG. 2, and the rising voltage of the signal waveform at the input portion of the transmission cable 6 (output signal of the transmission equivalent circuit 8) becomes high.
つまり、本実施例においては伝送ケーブル６に送出する
前に予め出力信号を微分しておくことにより、伝送ケー
ブル６によって積分された場合でも効果的に相殺し、信
号の劣化を補償することができるのである。こうするこ
とにより、レシーバ７ではデータを正しく受信すること
ができるのである。In other words, in this embodiment, by differentiating the output signal in advance before sending it to the transmission cable 6, even if it is integrated by the transmission cable 6, it can be effectively canceled out and signal deterioration can be compensated for. It is. By doing so, the receiver 7 can receive the data correctly.
発明の詳細
な説明したように本発明は、伝送ケーブルに送出する信
号を予め微分し、高周波成分を本来の信号より高くして
おくことにより、伝送ケーブルにおいて減衰する高周波
成分を補償して歪及びジッタの影響を減らし、通信デー
タのいわゆるデータ化は及び伝送エラーの発生を低減で
きるという効果がある。。Detailed Description of the Invention As described above, the present invention differentiates the signal sent to the transmission cable in advance and makes the high frequency component higher than the original signal, thereby compensating for the high frequency component attenuated in the transmission cable and eliminating distortion. This has the effect of reducing the influence of jitter, converting communication data into data, and reducing the occurrence of transmission errors. .
第１図は本発明の実施例による伝送回路の構成を示すブ
ロック図、第２図は第１図の各部の波形図、第３図は従
来の伝送回路の構成を示すブロック図、第４図は第３図
の各部の波形図である。
主要部分の符号の説明
１・・・・・・ドライバ
２．３・・・・・・抵抗
５・・・・・・コンデンサ
６・・・・・・ｆ云送ケーブル
７・・・・・・レシーバFIG. 1 is a block diagram showing the configuration of a transmission circuit according to an embodiment of the present invention, FIG. 2 is a waveform diagram of each part of FIG. 1, FIG. 3 is a block diagram showing the configuration of a conventional transmission circuit, and FIG. 4 3 is a waveform diagram of each part in FIG. 3. Explanation of symbols of main parts 1...Driver 2.3...Resistor 5...Capacitor 6...F transmission cable 7... receiver
Claims (1)
する伝送路を含む伝送回路であって、前記伝送路と前記
送信器との間にこの伝送路の積分特性により生じる信号
劣化を補償する微分特性を有する補償手段を有すること
を特徴とする伝送回路。(1) A transmission circuit including a transmission line having an integral characteristic provided between a transmitter and a receiver, wherein signal degradation occurs between the transmission line and the transmitter due to the integral characteristic of the transmission line. 1. A transmission circuit comprising compensation means having a differential characteristic for compensating for.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP63263486A JPH0779286B2 (en) | 1988-10-19 | 1988-10-19 | Transmission circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP63263486A JPH0779286B2 (en) | 1988-10-19 | 1988-10-19 | Transmission circuit |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH02111126A true JPH02111126A (en) | 1990-04-24 |
| JPH0779286B2 JPH0779286B2 (en) | 1995-08-23 |
Family
ID=17390183
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP63263486A Expired - Lifetime JPH0779286B2 (en) | 1988-10-19 | 1988-10-19 | Transmission circuit |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0779286B2 (en) |
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2004301562A (en) * | 2003-03-28 | 2004-10-28 | Nec Corp | Active load pull measuring method and active load pull measuring circuit |
| JP2004357004A (en) * | 2003-05-29 | 2004-12-16 | Nec Electronics Corp | Transmitter circuit, transmission circuit and driving device |
| JP2006211702A (en) * | 2006-03-06 | 2006-08-10 | Hitachi Ltd | Driver circuit having compensation means for transmission line loss |
| WO2007091307A1 (en) * | 2006-02-08 | 2007-08-16 | Fujitsu Limited | Differential signal transmitting apparatus, differential signal transport apparatus, and differential signal receiving apparatus |
| WO2007116765A1 (en) * | 2006-03-30 | 2007-10-18 | Advantest Corporation | Testing apparatus and testing method |
| WO2008023615A1 (en) * | 2006-08-24 | 2008-02-28 | Advantest Corporation | Testing apparatus and device manufacturing method using the testing apparatus |
| JP2010056620A (en) * | 2008-08-26 | 2010-03-11 | Ricoh Co Ltd | Driver circuit |
| JP2010516104A (en) * | 2007-01-09 | 2010-05-13 | ラムバス・インコーポレーテッド | Equalizing transmitter and method of operation |
| JP2012503415A (en) * | 2008-09-18 | 2012-02-02 | ムーグ インコーポレーテッド | Broadband twist capsule |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5958943A (en) * | 1982-09-28 | 1984-04-04 | Fujitsu Ltd | Data transmission system |
| JPS61191104A (en) * | 1985-02-20 | 1986-08-25 | Fujitsu Ltd | Distortion equalizer |
-
1988
- 1988-10-19 JP JP63263486A patent/JPH0779286B2/en not_active Expired - Lifetime
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5958943A (en) * | 1982-09-28 | 1984-04-04 | Fujitsu Ltd | Data transmission system |
| JPS61191104A (en) * | 1985-02-20 | 1986-08-25 | Fujitsu Ltd | Distortion equalizer |
Cited By (20)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2004301562A (en) * | 2003-03-28 | 2004-10-28 | Nec Corp | Active load pull measuring method and active load pull measuring circuit |
| JP2004357004A (en) * | 2003-05-29 | 2004-12-16 | Nec Electronics Corp | Transmitter circuit, transmission circuit and driving device |
| US8421727B2 (en) | 2003-05-29 | 2013-04-16 | Renesas Electronics Corporation | Transmitter circuit, transmission circuit and driver unit |
| WO2007091307A1 (en) * | 2006-02-08 | 2007-08-16 | Fujitsu Limited | Differential signal transmitting apparatus, differential signal transport apparatus, and differential signal receiving apparatus |
| JP4569497B2 (en) * | 2006-03-06 | 2010-10-27 | 株式会社日立製作所 | Driver circuit having transmission line loss compensation means |
| JP2006211702A (en) * | 2006-03-06 | 2006-08-10 | Hitachi Ltd | Driver circuit having compensation means for transmission line loss |
| WO2007116765A1 (en) * | 2006-03-30 | 2007-10-18 | Advantest Corporation | Testing apparatus and testing method |
| JP5113739B2 (en) * | 2006-03-30 | 2013-01-09 | 株式会社アドバンテスト | Test apparatus and test method |
| US7961629B2 (en) | 2006-03-30 | 2011-06-14 | Advantest Corporation | Test apparatus, test method, waveform generator and waveform generating method |
| WO2008023615A1 (en) * | 2006-08-24 | 2008-02-28 | Advantest Corporation | Testing apparatus and device manufacturing method using the testing apparatus |
| US8239147B2 (en) | 2006-08-24 | 2012-08-07 | Advantest Corporation | Test apparatus and manufacturing method |
| JPWO2008023615A1 (en) * | 2006-08-24 | 2010-01-07 | 株式会社アドバンテスト | Test apparatus and device manufacturing method using the test apparatus |
| JP2010516104A (en) * | 2007-01-09 | 2010-05-13 | ラムバス・インコーポレーテッド | Equalizing transmitter and method of operation |
| US9148313B2 (en) | 2007-01-09 | 2015-09-29 | Rambus, Inc. | Equalizing transmitter and method of operation |
| US9749160B2 (en) | 2007-01-09 | 2017-08-29 | Rambus Inc. | Equalizing transmitter and method of operation |
| US10200220B2 (en) | 2007-01-09 | 2019-02-05 | Rambus Inc | Equalizing transmitter and method of operation |
| US10505769B2 (en) | 2007-01-09 | 2019-12-10 | Rambus Inc. | Equalizing transmitter and method of operation |
| US11121893B2 (en) | 2007-01-09 | 2021-09-14 | Rambus Inc. | Equalizing transmitter and method of operation |
| JP2010056620A (en) * | 2008-08-26 | 2010-03-11 | Ricoh Co Ltd | Driver circuit |
| JP2012503415A (en) * | 2008-09-18 | 2012-02-02 | ムーグ インコーポレーテッド | Broadband twist capsule |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0779286B2 (en) | 1995-08-23 |
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