WO2010061511A1 - 信号伝送装置 - Google Patents
信号伝送装置 Download PDFInfo
- Publication number
- WO2010061511A1 WO2010061511A1 PCT/JP2009/005037 JP2009005037W WO2010061511A1 WO 2010061511 A1 WO2010061511 A1 WO 2010061511A1 JP 2009005037 W JP2009005037 W JP 2009005037W WO 2010061511 A1 WO2010061511 A1 WO 2010061511A1
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- WIPO (PCT)
- Prior art keywords
- circuit
- signal
- ground
- signal transmission
- transmission
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- 230000008054 signal transmission Effects 0.000 title claims abstract description 52
- 230000005540 biological transmission Effects 0.000 claims abstract description 53
- 230000000903 blocking effect Effects 0.000 claims description 3
- 238000000034 method Methods 0.000 description 6
- 238000006243 chemical reaction Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000002955 isolation Methods 0.000 description 2
- 230000006866 deterioration Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000000644 propagated effect Effects 0.000 description 1
- 239000000758 substrate Substances 0.000 description 1
- 230000002123 temporal effect Effects 0.000 description 1
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Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B3/00—Line transmission systems
- H04B3/50—Systems for transmission between fixed stations via two-conductor transmission lines
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B15/00—Suppression or limitation of noise or interference
- H04B15/02—Reducing interference from electric apparatus by means located at or near the interfering apparatus
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B3/00—Line transmission systems
- H04B3/02—Details
- H04B3/30—Reducing interference caused by unbalanced currents in a normally balanced line
Definitions
- the present invention relates to a signal transmission device in which a transmission circuit and a reception circuit are connected via a signal transmission path.
- a serial interface such as EIA 232 or IEEE 1284, a logic signal such as TTL or MOS, or many analog signals use one signal line for each signal, and send the signal as a voltage with respect to the ground of the signal.
- This signal transmission method is called unbalanced transmission, and the signal is called a single end signal.
- digital interfaces for connecting communication devices and flat panel displays such as 100Base-T, LVDS (Low Voltage Differential signal), etc.
- 100Base-T LVDS (Low Voltage Differential signal), etc.
- LVDS Low Voltage Differential signal
- power supply circuits 36 and 37 supply power to the transmission circuit 31 and the reception circuit 32, respectively.
- the signal line 33 may be isolated by a photocoupler 40 or the like in order to remove digital noise and jitter contained in the input signal.
- 34 and the GND line 35 a loop is still formed between the transmission circuit 31 and the reception circuit 32, so that digital noise including jitter is propagated, resulting in a decrease in sound quality.
- the present invention has been made to solve the above-described problem, and prevents digital noise other than signal components output from the transmission circuit from entering the reception circuit via the signal line, the power supply line, and the ground line.
- An object is to provide a signal transmission device.
- the signal transmission device prevents a transmission circuit and a reception circuit each having a shunt-type power supply for supplying a constant current, and an AC component connecting between the transmission circuit and the reception circuit.
- the transmission circuit ground and the reception circuit ground are independent of each other, and are connected to the ground of the shunt-type power supply at one point.
- the transmission circuit and the reception circuit are independent from each other and are connected to the ground of the shunt-type power supply at one point, the transmission circuit and the reception circuit connected to the signal transmission line at one point are provided. No current flows in the loop created through ground. Therefore, the ground potential of the ground of the transmission circuit and the reception circuit is kept constant, and digital noise other than the signal component output from the transmission circuit is mixed into the reception circuit via the signal line, the power supply line, and the ground line.
- a signal transmission device for blocking can be provided.
- FIG. 1 It is a block diagram which shows the circuit structure of the signal transmission apparatus which concerns on Embodiment 1 of this invention. It is a figure which shows an example of the circuit structure of the conventional signal transmission apparatus. It is a figure which shows the other example of the circuit structure of the conventional signal transmission apparatus.
- FIG. 1 is a block diagram showing a circuit configuration of a signal transmission apparatus according to Embodiment 1 of the present invention.
- the signal transmission device 10 according to the first embodiment of the present invention includes a transmission circuit 11 and a reception circuit 12.
- Each of the transmission circuit 11 and the reception circuit 12 includes shunt regulator power supplies (shunt-type power supplies) 110 and 120 that independently supply a constant current.
- the transmission circuit 11 is, for example, a digital signal processing circuit
- the reception circuit 12 is, for example, a DA conversion circuit, which are connected by a signal transmission path 13.
- balanced transmission is used as the signal transmission method in order to block the AC signal component flowing from the transmission circuit 11 to the reception circuit 12 via the signal transmission path 13.
- the balanced transmission is a method in which two equal signal line pairs are used for one signal flowing through the signal transmission path 13 and the signal is transmitted as a potential difference between the signal line pairs.
- the transmission circuit 11 outputs a signal having an opposite phase between the cold ( ⁇ ) and the ground (GND A ) with respect to the signal between the hot (+) and the ground (GND A ).
- the receiving circuit 12 is configured to remove external noise using a differential receiver (not shown) between hot (+) and cold ( ⁇ ).
- a ground (GND A) and the receiving circuit 12 ground of the transmission circuit 11 (GND B) and independent ground of the shunt regulator power supply 110, 120 A configuration is adopted in which a common connection is made at one point of (GND C ).
- the shunt regulator power supplies 110 and 120 supply power to the transmission circuit 11 and the reception circuit 12 independently, but at this time, a constant current is supplied by the current source. At that time, a constant current value flows from the shunt regulator power supplies 110 and 120 to the transmission circuit 11 and the reception circuit 12, and 1 from the transmission circuit 11 and the reception circuit 12 via the respective grounds (GND A , GND B ). The value of the current flowing into the point ground (GND C ) is also constant. As a result, the potential of each ground (GND A , GND B ) of the transmission circuit 11 and the reception circuit 12 is kept constant.
- the signal transmission method between the transmission circuit 11 and the reception circuit 12 adopts balanced transmission, the signal flowing through the signal transmission path 13 has a constant current value, and therefore, the signal transmission system is connected to the signal transmission path 13 and the power supply GND C. Alternating current does not flow in the loop formed through the grounds (GND A , GND B ) of the transmission circuit 11 and the reception circuit 12.
- each of the grounds (GND A , GND B) of the transmission circuit 11 and the reception circuit 12 is obtained as a result of blocking the inflow and outflow of alternating current to any of the signal line (signal transmission line 13), the power supply line, and the ground line. ) Potential fluctuations can be prevented. For this reason, the potential of each ground (GND A , GND B ) is stabilized, and propagation of digital noise such as jitter generated during signal transmission can be prevented.
- each of the transmission circuit 11 and the reception circuit 12 includes the shunt regulator power supplies 110 and 120 independently, so that the transmission circuit 11 and the reception as viewed from the power supply side.
- the supply current value in the circuit 12 becomes constant, and the current value flowing from each of the transmission circuit 11 and the reception circuit 12 to each ground (GND A and GND B ) is also kept constant.
- balanced transmission is used as a signal transmission method from the transmission circuit 11 to the reception circuit 12, and the grounds (GND A and GND B ) of the transmission circuit 11 and the reception circuit 12 are independent from each other, and the ground (GND C at one point). ),
- the current value supplied from the transmission circuit 11 to the reception circuit 12 becomes constant, and the signal transmission path 13 and the transmission circuit 11 and the reception circuit 12 connected to the ground (GND C ) Alternating current does not flow through the loop formed via each ground (GND A , GND B ).
- the signal transmission device As described above, according to the signal transmission device according to the first embodiment of the present invention, as a result of preventing the inflow and outflow of alternating current to any of the signal line, the power supply line, and the ground line, the transmission circuit 11 and the reception circuit 12 ground potential fluctuations can be prevented. This stabilizes the ground potential and prevents the propagation of digital noise such as jitter that occurs during signal transmission. In addition, jitter caused by temporal variations in the threshold level of the digital circuit caused by fluctuations in the potential between grounds can be prevented. Occurrence can also be suppressed.
- the signal transmission device according to the first embodiment of the present invention is particularly effective when applied to the field of digital audio in which mixing of digital noise appears remarkably in sound quality and performance.
- Embodiment 2 According to the signal transmission device according to the first embodiment described above, two equal signal line pairs are provided for one signal flowing through the signal transmission path 13 for signal transmission from the transmission circuit 11 to the reception circuit 12.
- the AC signal component flowing into the receiving circuit 12 from the transmitting circuit 11 through the signal transmission path 13 is blocked by transmitting the signal as a potential difference between the signal line pair.
- the same effect can be obtained even if the AC signal component flowing into the receiving circuit 12 from the transmitting circuit 11 via the signal transmission path 13 is blocked by the isolation by the photocoupler 40 shown in FIG.
- the photocoupler 40 may be replaced with a pulse transformer.
- a constant current is supplied from the respective shunt regulator power supplies 110 and 120 mounted in the transmission circuit 11 and the reception circuit 12 to the transmission circuit 11 and the reception circuit 12.
- the current value flowing from the transmitting circuit 11 and the receiving circuit 12 through the respective grounds (GND A , GND B ) to one ground (GND C ) is also constant, each ground (GND) A , GND B ) is kept constant.
- the transmission circuit 11 connected to the signal transmission path 13 and the ground (GNDc) at one point is received. No current flows through the loop formed through each ground (GND A , GND B ) of the circuit 12. As a result, the ground potential of the transmission circuit 11 and the reception circuit 12 is kept constant, and the propagation of digital noise through the signal line, power supply line, and ground line due to current fluctuation is eliminated.
- the present invention can be applied to all electronic devices such as 100Base-T, ETA485, and LVDS, which are equipped with a digital interface for connecting a communication device and a flat panel display.
- the signal transmission device can prevent digital noise other than the signal component output from the transmission circuit from entering the reception circuit via the signal line, the power supply line, and the ground line. Is suitable for use in a signal transmission device connected through a signal transmission path.
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- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Dc Digital Transmission (AREA)
- Noise Elimination (AREA)
Abstract
Description
この信号伝送方式は不平衡電圧伝送(unbalanced transmission)と呼ばれ、その信号はシングルエンド信号(single end)と呼ばれている。
この信号伝送方式は平衡伝送(balanced transmission)と呼ばれ、その信号は差動信号(differential signal)と呼ばれている。
例えば、図2に示されるように、デジタル信号処理回路等からなる送信回路31と、DA(Digital Analog)変換回路等からなる受信回路32とが同一基板上に実装されている場合、送信回路31により発生されるデジタルノイズ(交流信号成分)が信号ライン33、電源ライン34、GNDライン35を伝播して受信回路32や当該受信回路以降に接続されるアナログ回路に混入すると、アナログ信号のSN比(Signal to Noise Rate)や歪率の劣化が生じ、その結果、音質が低下する。
実施の形態1.
図1は、この発明の実施の形態1に係る信号伝送装置の回路構成を示すブロック図である。図1に示されるように、この発明の実施の形態1に係る信号伝送装置10は、送信回路11および受信回路12により構成される。この送信回路11および受信回路12はそれぞれ独立して一定の電流を流し込むシャントレギュレータ電源(シャント形電源)110,120を備えている。
ここでは、送信回路11から信号伝送路13を介して受信回路12に流入する交流信号成分を阻止するために、信号伝送方式として平衡伝送を用いることとした。
具体的に、図1に示されるように、送信回路11は、ホット(+)-グランド(GNDA)間の信号に対し、コールド(-)-グランド(GNDA)間は逆位相の信号を伝送する。このため、受信回路12は、ホット(+)-コールド(-)間で、不図示の差動形レシーバを用いて外来ノイズを除去する構成になっている。
更に、送信回路11と受信回路12間の信号伝送方式も平衡伝送を採用することで信号伝送路13を流れる信号は一定の電流値になるため、信号伝送路13と電源GNDCに接続された送信回路11および受信回路12の各グランド(GNDA、GNDB)を介して出来るループに交流電流は流れない。
この発明の実施の形態1に係る信号伝送装置は、特に、デジタルノイズの混入が音質や性能に顕著に現れるデジタルオーディオの分野に適用して大きな効果が得られる。
上記した実施の形態1に係る信号伝送装置によれば、送信回路11から受信回路12への信号伝送に、信号伝送路13を流れる一つの信号に対して2本の対等な信号線のペアを用い、信号を信号線ペアの間の電位差として送信することにより、送信回路11から信号伝送路13を介して受信回路12に流入する交流信号成分を阻止することとしたが、上記した平衡伝送に代え、例えば、図3に示されるフォトカプラー40によるアイソレーションにより、送信回路11から信号伝送路13を介して受信回路12に流入する交流信号成分を阻止しても同様の効果が得られる。また、フォトカプラー40をパルストランスで代替してもよい。
Claims (3)
- 一定の電流を流し込むシャント形電源をそれぞれ備えた送信回路および受信回路と、
前記送信回路と前記受信回路との間を接続する交流成分を阻止する機能を有する信号伝送路とを備え、
前記送信回路のグランドと前記受信回路のグランドをそれぞれ独立とし、1点で前記シャント形電源のグランドに接続配置してなることを特徴とする信号伝送装置。 - 前記信号伝送路は、一つの信号に対して2本の対等な信号線のペアを用い、前記信号を前記信号線ペアの間の電位差として送信する平衡差動信号伝送回路であることを特徴とする請求項1記載の信号伝送装置。
- 前記信号伝送路は、フォトカプラーを有することを特徴とする請求項1記載の信号伝送装置。
Priority Applications (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE112009002472T DE112009002472T5 (de) | 2008-11-28 | 2009-09-30 | Signalübertragungsvorrichtung |
CN2009801426174A CN102197602A (zh) | 2008-11-28 | 2009-09-30 | 信号传输装置 |
JP2010540306A JPWO2010061511A1 (ja) | 2008-11-28 | 2009-09-30 | 信号伝送装置 |
US13/062,269 US20110148477A1 (en) | 2008-11-28 | 2009-09-30 | Signal transmission device |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2008303675 | 2008-11-28 | ||
JP2008-303675 | 2008-11-28 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2010061511A1 true WO2010061511A1 (ja) | 2010-06-03 |
Family
ID=42225403
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/JP2009/005037 WO2010061511A1 (ja) | 2008-11-28 | 2009-09-30 | 信号伝送装置 |
Country Status (5)
Country | Link |
---|---|
US (1) | US20110148477A1 (ja) |
JP (1) | JPWO2010061511A1 (ja) |
CN (1) | CN102197602A (ja) |
DE (1) | DE112009002472T5 (ja) |
WO (1) | WO2010061511A1 (ja) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN102868863A (zh) * | 2011-07-06 | 2013-01-09 | 广明光电股份有限公司 | 模拟视频信号传输装置 |
EP3282585A1 (en) | 2016-08-08 | 2018-02-14 | Yokogawa Electric Corporation | Signal transmission circuit, field device, and plant control system |
Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
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JPH06326487A (ja) * | 1993-05-18 | 1994-11-25 | Fujitsu Ltd | 電子装置間の接続方法 |
JPH07226271A (ja) * | 1994-02-10 | 1995-08-22 | Matsushita Electric Works Ltd | 信号線接続用アダプタ装置 |
JP2007259153A (ja) * | 2006-03-23 | 2007-10-04 | Makoto Miyahara | 電源回路及びディジタル・アナログ変換器、並びに電子機器 |
Family Cites Families (10)
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NL7306137A (ja) * | 1973-05-03 | 1974-11-05 | ||
JPH08340669A (ja) * | 1995-06-09 | 1996-12-24 | Hitachi Ltd | スイッチングレギュレータ回路およびこれを実装した半導体集積回路装置 |
JPH0924022A (ja) * | 1996-08-05 | 1997-01-28 | Olympus Optical Co Ltd | 電子内視鏡装置 |
JPH10225004A (ja) * | 1997-02-12 | 1998-08-21 | Canon Inc | バッテリー制御方法及び装置並びに記憶媒体 |
JP4612082B2 (ja) * | 1998-08-07 | 2011-01-12 | 株式会社平和 | パチンコ機の賞球払出装置 |
JP2004128629A (ja) * | 2002-09-30 | 2004-04-22 | Nec Engineering Ltd | 信号伝送回路 |
JP2005019685A (ja) * | 2003-06-26 | 2005-01-20 | Sony Corp | トランスおよび高電圧発生装置 |
JP2005183790A (ja) * | 2003-12-22 | 2005-07-07 | Denso Corp | プリント配線基板 |
JP2006101154A (ja) * | 2004-09-29 | 2006-04-13 | Canon Inc | 撮像装置 |
JP5034546B2 (ja) * | 2007-02-21 | 2012-09-26 | 三菱電機株式会社 | フォトカプラ回路 |
-
2009
- 2009-09-30 WO PCT/JP2009/005037 patent/WO2010061511A1/ja active Application Filing
- 2009-09-30 US US13/062,269 patent/US20110148477A1/en not_active Abandoned
- 2009-09-30 CN CN2009801426174A patent/CN102197602A/zh active Pending
- 2009-09-30 DE DE112009002472T patent/DE112009002472T5/de not_active Withdrawn
- 2009-09-30 JP JP2010540306A patent/JPWO2010061511A1/ja active Pending
Patent Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH06326487A (ja) * | 1993-05-18 | 1994-11-25 | Fujitsu Ltd | 電子装置間の接続方法 |
JPH07226271A (ja) * | 1994-02-10 | 1995-08-22 | Matsushita Electric Works Ltd | 信号線接続用アダプタ装置 |
JP2007259153A (ja) * | 2006-03-23 | 2007-10-04 | Makoto Miyahara | 電源回路及びディジタル・アナログ変換器、並びに電子機器 |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN102868863A (zh) * | 2011-07-06 | 2013-01-09 | 广明光电股份有限公司 | 模拟视频信号传输装置 |
EP3282585A1 (en) | 2016-08-08 | 2018-02-14 | Yokogawa Electric Corporation | Signal transmission circuit, field device, and plant control system |
US10558202B2 (en) | 2016-08-08 | 2020-02-11 | Yokogawa Electric Corporation | Signal transmission circuit, field device, and plant control system |
Also Published As
Publication number | Publication date |
---|---|
JPWO2010061511A1 (ja) | 2012-04-19 |
US20110148477A1 (en) | 2011-06-23 |
DE112009002472T5 (de) | 2011-11-24 |
CN102197602A (zh) | 2011-09-21 |
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