CN101399882A - Terminal device for digital subscriber line xDSL - Google Patents
Terminal device for digital subscriber line xDSL Download PDFInfo
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- CN101399882A CN101399882A CNA2008101712031A CN200810171203A CN101399882A CN 101399882 A CN101399882 A CN 101399882A CN A2008101712031 A CNA2008101712031 A CN A2008101712031A CN 200810171203 A CN200810171203 A CN 200810171203A CN 101399882 A CN101399882 A CN 101399882A
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Abstract
The invention provides an XDSL terminal device of a digital user line, which is applied to the technical field of electron. In the invention, an ESD protection module is connected between an interface and an earthing module for leading a high voltage static into the external ground by the ESD protection module. Compared with the ESD protection module connected between a central processing module and the earthing module in the prior art, the XDSL terminal device of a digital user line only needs to be added with a protection apparatus at the location of the interface for leading a static signal to be reflowed into the external earth and reducing the static voltage coupled at the location of sensitive pins, thereby being incapable of affecting the accurate location of the sensitive pins of a chip in the central processing module; besides, as the pins at the interface location are less, the effects of the distribution parameters of the protection apparatus to the signal quality of a product are reduced; simultaneously, the protection apparatus needed to be added are less, thus reducing the cost of the product. Anyhow, the XDSL terminal device of a digital user line ensures the product to successfully pass the ESD noise immunity test accessed by a market and also ensures the EMC property indexes of the product.
Description
Technical field
The present invention relates to electronic technology field, particularly terminal device for digital subscriber line xDSL.
Background technology
In electronic technology field, because the accumulation meeting of electrostatic charge produces very high voltage (for example 10000 volts or higher) in integrated circuit (IC), the input of integrated circuit and or the output node place produce the phenomenon of high-energy discharge electric current, be Electrostatic Discharge, can cause whole integrated circuit can not work or damage whole integrated circuit like this.Float the ground electronic product in electromagnetic compatibility (EMC) test of the market access for having accessing terminal of the outdoor port of digital subscriber line (xDSL) especially, often appearance is that the vulnerability to jamming relatively poor ESD of causing static contact discharge of central processing unit (CPU) kernel and atmospherical discharges immunity to interference are tested the phenomenon of not passing through because of master chip.Therefore adding esd protection circuit in terminal equipment is necessary; in the prior art; in order to improve the anti-ESD antistatic property of integrated circuit, adopt near the mode of protective devices such as the sensitiveness pin, adding decoupling capacitor or Transient Voltage Suppressor (TVS), piezo-resistance (MLV), fast recovery diode.
With the xDSL product is example, be illustrated in figure 1 as typical xDSL products-hardware structural representation, when carrying out the test of ESD immunity to interference, the electrostatic interference signal often is coupled to product circuit plate (PCB) inside by interface, when accumulation of static electricity when to a certain degree influencing the responsive pin of CPU master chip, will cause data transmission links such as network interface, DSL mouth, USB mouth to interrupt.Existing ESD protectiving scheme is to pass through the ESD protection module at the CPU of xDSL product pin place, and high-pressure electrostatic is introduced ground.Be depicted as concrete implementation method as Fig. 2 a, 2b, 2c, increase decoupling capacitor, piezo-resistance, transient state suppressing pipe respectively at the CPU of xDSL product pin place, the static of high pressure is introduced ground, suppress the electrostatic interference signal by these devices.The metal-oxide-semiconductor protection design that also has a lot of situation products to rely on chip internal fully reaches the protection purpose.
The present inventor finds that there is following problem at least in existing xDSL terminal equipment in the process to prior art practice and research:
CPU master chip pin in the electronic product is more, need the protective device of interpolation more, and chip internal circuit complexity is difficult to accurately navigate to responsive pin; The distributed constant of protective device often also can influence the signal quality of product, causes that transmission signals is imperfect; Simultaneously, too much protective device can increase the cost of product.In a word, the ESD protection circuit in the existing xDSL terminal equipment has influenced the test of market access ESD immunity to interference, can not guarantee the EMC performance index of product.
Summary of the invention
The invention provides a kind of terminal device for digital subscriber line xDSL, this processing by docking port guarantees that product smoothly by market access ESD immunity to interference test, also guarantees the EMC performance index of product.
A kind of terminal device for digital subscriber line xDSL provided by the invention, comprise: at least one interface, static discharge module, earthing module and central processing module, described interface links to each other with central processing module, an end points of described interface is connected with an end of described static discharge module, and the other end of described static discharge module is connected with described earthing module.
The present invention connects the ESD protection module between interface and earthing module, make high-pressure electrostatic pass through the ESD protection module and introduce outside the earth.And in the prior art by comparing being connected the ESD protection module between central processing module and the earthing module, the present invention only needs to add protective device at interface, electrostatic signal is back to outside the earth, reduce the electrostatic energy of the chip place accumulation of central processing module, reduce the electrostatic potential of responsive pin place coupling, thereby can not have influence on the accurate location of the responsive pin of central processing module chips; In addition, because the pin of interface is less, thereby reduced the signal quality that influence product of the distributed constant of protective device to signal quality, the protective device that needs simultaneously to add can be less, reduced the cost of product.The present invention guarantees that product smoothly by market access ESD immunity to interference test, also guarantees the EMC performance index of product in a word.
Description of drawings
In order to be illustrated more clearly in the embodiment of the invention or technical scheme of the prior art, to do to introduce simply to the accompanying drawing of required use in embodiment or the description of the Prior Art below, apparently, accompanying drawing in describing below only is some embodiments of the present invention, for those of ordinary skills, under the prerequisite of not paying creative work, can also obtain other accompanying drawing according to these accompanying drawings.
Fig. 1 is typical xDSL products-hardware structural representation;
Fig. 2 a is an ESD protectiving scheme structural representation in the typical xDSL product;
Fig. 2 b is another ESD protectiving scheme structural representation in the typical xDSL product;
Fig. 2 c is an another ESD protectiving scheme structural representation in the typical xDSL product;
Fig. 3 is the structural representation of the terminal device for digital subscriber line xDSL that provides of the embodiment of the invention one;
Fig. 4 is the structural representation of the terminal device for digital subscriber line xDSL that provides of the embodiment of the invention two;
Fig. 5 a is the electrical block diagram at power port place in the terminal device for digital subscriber line xDSL that provides of the embodiment of the invention two;
Fig. 5 b is the electrical block diagram at network interface place in the terminal device for digital subscriber line xDSL that provides of the embodiment of the invention two;
Fig. 6 is the structural representation of the terminal device for digital subscriber line xDSL that provides of the embodiment of the invention three;
Fig. 7 is the electrical block diagram at USB mouth place in the terminal device for digital subscriber line xDSL that provides of the embodiment of the invention three.
Embodiment
The invention provides a kind of terminal device for digital subscriber line xDSL, be applied to electronic technology field.
The present invention utilizes the ESD protection module that electrostatic signal is introduced the earth from power port or other ESD contact discharge point, atmospherical discharges point, if xDSL terminal terminal equipment is a floating ground equipment, need earlier static to be guided on the veneer GND, and the static on the GND can not directly be back to the earth, need to be back to the earth in the mode of common mode by USB mouth, network interface or DSL mouth, guarantee that so responsive CPU master chip is not subjected to the influence of electrostatic signal, can operate as normal.
Below in conjunction with the accompanying drawing in the embodiment of the invention, the technical scheme in the embodiment of the invention is clearly and completely described, obviously, described embodiment only is the present invention's part embodiment, rather than whole embodiment.Based on the embodiment among the present invention, those of ordinary skills belong to the scope of protection of the invention not making the every other embodiment that is obtained under the creative work prerequisite.
Embodiment one, a kind of terminal device for digital subscriber line xDSL, structural representation as shown in Figure 3, comprise: at least one interface 11, static discharge ESD protection module 12, earthing module 13 and central processing module 14, described interface 11 links to each other with central processing module 14, accepts the management of central processing module 14.Interface 11 signal transmission ends is connected with an end of ESD protection module 12 in this equipment, and the other end of ESD protection module 12 is connected with described earthing module 13.
Be appreciated that, the interface 11 here is meant power port or atmospherical discharges point or other ESD contact discharge point, promptly doing the high-pressure electrostatic decanting point of choosing when the ESD immunity to interference is tested, generally be meant the product interface that human body reality can touch, as mains switch, screw fixing point, netting twine interface, telephone line interface, electric source line interface etc.
Described ESD protection module 12 can be a safety electric capacity, because safety electric capacity has very strong withstand voltage, can bear certain power, therefore can be as the discharge protection module of high-pressure electrostatic, and electric capacity has " handing over every straight-through ", is connected between interface and the earthing module 13, makes high-pressure electrostatic to discharge by electric capacity, and the introducing the earth, and can not cause the excessive and consequence that causes entire circuit not move of electric current.Described ESD protection module 12 also can be a fast recovery diode; because fast recovery diode has certain withstand voltage; the withstand voltage that surpasses it when electrostatic high-pressure; diode is breakdown; fast recovery diode then is operated in its breakdown region, and the electrostatic potential clamper at a lower magnitude of voltage, is connected between interface and the earthing module 13; prevented the damage that the static discharge of the high pressure of interface brings to circuit, thus other device in the protective circuit.
As seen, the present invention connects ESD protection module 12 between interface and earthing module 13, makes high-pressure electrostatic pass through ESD protection module 12 and introduces the earth.And in the prior art by comparing being connected ESD protection module 12 between central processing module and the earthing module 13, only need to add protective device at interface, electrostatic signal is back to outside the earth, reduce the electrostatic energy of the chip place accumulation of central processing module, reduce the electrostatic potential of responsive pin place coupling, thereby can not have influence on the accurate location of the responsive pin of central processing module chips; In addition, because the pin of interface is less, thereby reduced the signal quality that influence product of the distributed constant of protective device to signal quality, the protective device that needs simultaneously to add can be less, reduced the cost of product.The present invention guarantees that product smoothly by market access ESD immunity to interference test, also guarantees the EMC performance index of product in a word.
Embodiment two, a kind of terminal device for digital subscriber line xDSL, the terminal equipment of present embodiment is a floating ground equipment, structural representation as shown in Figure 4, comprise: power port 20, network interface 21, ESD protection module 22, earthing module and central processing module 24, wherein: power port 20, network interface 21 all are connected with central processing module 24, accept the management of central processing module 24.ESD protection module 23 comprises safety electric capacity in the present embodiment, and earthing module comprises digitally GND of veneer.
A signal transmission ends of described power port 20 and a signal transmission ends of network interface 21 are connected with a end of safety electric capacity in the described ESD protection module 22 respectively, the other end of described ESD protection module 22 is connected with described GND, and the static of power port 20 and network interface 21 is just guided to GND by ESD protection module 22 like this; The earth end that connects of described network interface 21 is connected with described GND, guides to the static of GND and can introduce the earth by the earth end that connects of network interface 21.Alternatively, the earth end that connects of network interface 21 is connected as safety electric capacity by another ESD protection module 25 with described GND, the protection static discharge.
Be appreciated that, the signal transmission ends of power port 20 and network interface 21 is guided to static on the GND by ESD protection module 22 in the present embodiment, the signal transmission ends that also can be power port 20 and network interface 21 is guided to static on the GND by two ESD protection submodules in the ESD protection module 22 respectively, other form method of attachment also can be arranged, and this is not construed as limiting the invention.Below by two ESD protection submodules in the ESD protection module static is guided to the physical circuit that GND is example explanation power port 20 and network interface 21 places respectively with the signal transmission ends of power port 20 and network interface 21:
Shown in Fig. 5 a, be the physical circuit at power port 20 places, power port generally is a metal pin, is connected with the end of safety capacitor C 81, C82 respectively in two signal transmission ends of power port, the other end of safety electric capacity is connected with GND.The high-pressure electrostatic signal can be toward the direction transmission of diode after the input of the signal transmission ends of power port 20, but by this path of safety electric capacity, introduces on the GND ground level of veneer, and the earth end that connects that is transferred to network interface 21 by the GND ground level is introduced the earth then.Be appreciated that and connect safety electric capacity in a signal transmission ends of power port.
Shown in Fig. 5 b, be the physical circuit at network interface 21 places, be connected safety capacitor C 74 in the signal transmission ends 5 of net mouth transformer T1 with 12 pin, protected the high-pressure electrostatic discharge at network interface 21 places, import high-pressure electrostatic into GND by safety capacitor C 74.At network interface J4 is that the earth end 7,8 pin that connect of socket connect safety capacitor C 75, can be with the electrostatic signal of GND ground level by safety capacitor C 75, and the geodesic that connects by network interface 21 is back to the earth then.
Interface to embodiment one in the present embodiment carries out refinement, is specially power port 20 and network interface 21, illustrates that further the present invention connects the ESD protection module connects the ESD protection module at the central processing module place than prior art superiority at interface.
Embodiment three, a kind of terminal device for digital subscriber line xDSL, the terminal equipment of present embodiment is a floating ground equipment, and present embodiment is compared with embodiment two, DSL mouth and USB mouth have been increased, structural representation is as shown in Figure 6: the signal transmission ends of 4 of terminal equipment interfaces (power port, network interface, USB mouth and DSL mouth) is connected with 4 ESD protection submodules in the ESD protection module respectively in the present embodiment, and the static of interface is introduced GND by ESD protection submodule respectively; GND is connected with the earth end that connects of network interface, USB mouth and DSL mouth by another ESD protection module again, and the static of introducing GND is introduced the earth by the earth end that connects of network interface, USB mouth and DSL mouth.
Be appreciated that, network interface, USB mouth and DSL mouth connects the earth end and can be connected with GND by another ESD protection module in the present embodiment, also can be connected with GND by 3 another ESD protection submodules in another ESD protection module, below with the latter's connected mode the physical circuit at USB mouth place is described, and described in the physical circuit at network interface place such as the embodiment two, do not repeat them here:
As shown in Figure 7, physical circuit for USB mouth place, the ESD protection module of the signal transmission ends of the connection USB mouth in the present embodiment adopts fast recovery diode, two common electric capacity of C87, C88 have been connected respectively and D16, D17 fast recovery diode protect port static at signal transmission ends 2,3 pin of USB mouth J3, like this D16, D17 fast recovery diode respectively the static of 2,3 pin clamp down on a very low voltage, by C87, C88 the voltage clamped down on described 2,3 pin is introduced GND respectively again; The earth end 5, the 6 pin places that connect at USB mouth J3 connect safety capacitor C 77, and the static of introducing GND is back to the earth by the USB line.
The present invention connects the ESD protection module between interface and earthing module, make high-pressure electrostatic pass through the ESD protection module and introduce outside the earth.And in the prior art by comparing being connected the ESD protection module between central processing module and the earthing module, the present invention only needs to add protective device at interface, electrostatic signal is back to outside the earth, reduce the electrostatic energy of the chip place accumulation of central processing module, reduce the electrostatic potential of responsive pin place coupling, thereby can not have influence on the accurate location of the responsive pin of central processing module chips; In addition, because the pin of interface is less, thereby reduced the signal quality that influence product of the distributed constant of protective device to signal quality, the protective device that needs simultaneously to add can be less, reduced the cost of product.The present invention guarantees that product smoothly by market access ESD immunity to interference test, also guarantees the EMC performance index of product in a word.
More than the xDSL terminal equipment that the embodiment of the invention provided is described in detail, used specific case herein principle of the present invention and execution mode are set forth, the explanation of above embodiment just is used for helping to understand method of the present invention and core concept thereof; Simultaneously, for one of ordinary skill in the art, according to thought of the present invention, the part that all can change in specific embodiments and applications, in sum, this description should not be construed as limitation of the present invention.
Claims (6)
1, a kind of terminal device for digital subscriber line xDSL, comprise: at least one interface, static discharge ESD protection module, earthing module and central processing module, described interface links to each other with central processing module, it is characterized in that, a signal transmission ends of described interface is connected with an end of described ESD protection module, and the other end of described ESD protection module is connected with described earthing module.
2, terminal device for digital subscriber line xDSL as claimed in claim 1 is characterized in that, described ESD protection module is safety electric capacity or fast recovery diode.
3, terminal device for digital subscriber line xDSL as claimed in claim 1, it is characterized in that, if described at least one interface comprises power port and network interface, described earthing module comprises digitally GND of veneer, then a signal transmission ends of described power port signal transmission ends and network interface is connected with an end of described ESD protection module respectively, the other end of described ESD protection module is connected with described GND, and the earth end that connects of described network interface is connected with described GND.
4, terminal device for digital subscriber line xDSL as claimed in claim 3, it is characterized in that, described at least one interface also comprises digital subscriber line DSL mouth, a signal transmission ends of described DSL mouth is connected with an end of described ESD protection module, and the earth end that connects of described DSL mouth is connected with described GND.
5, terminal device for digital subscriber line xDSL as claimed in claim 3, it is characterized in that, described at least one interface also comprises the general-purpose serial bus USB mouth, a signal transmission ends of described USB mouth is connected with an end of described ESD protection module, and the earth that connects of described DSL mouth is connected with described GND.
6, as each described terminal device for digital subscriber line xDSL of claim 3 to 5, it is characterized in that, described earthing module also comprises another ESD protection module, and the earth end that connects of described network interface or USB mouth or DSL mouth is connected with described GND by described another ESD protection module.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2008101712031A CN101399882A (en) | 2008-10-24 | 2008-10-24 | Terminal device for digital subscriber line xDSL |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2008101712031A CN101399882A (en) | 2008-10-24 | 2008-10-24 | Terminal device for digital subscriber line xDSL |
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| CN101399882A true CN101399882A (en) | 2009-04-01 |
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| Application Number | Title | Priority Date | Filing Date |
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| CNA2008101712031A Pending CN101399882A (en) | 2008-10-24 | 2008-10-24 | Terminal device for digital subscriber line xDSL |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103515945A (en) * | 2013-10-23 | 2014-01-15 | 青岛歌尔声学科技有限公司 | Esd reinforcing circuit |
| CN104461107A (en) * | 2013-09-24 | 2015-03-25 | 胜华科技股份有限公司 | Touch panel |
| WO2016179829A1 (en) * | 2015-05-14 | 2016-11-17 | Texas Instruments Incorporated | Usb controller esd protection apparatus and method |
| CN107072131A (en) * | 2017-06-27 | 2017-08-18 | 苏州交运电子科技有限公司 | Electronic equipment static discharge solution and apply its electronic equipment |
| CN107703457A (en) * | 2017-09-26 | 2018-02-16 | 重庆市珞宾信息技术有限公司 | A kind of vehicular power-bottle low power testing device and method |
| CN107918680A (en) * | 2016-10-08 | 2018-04-17 | 深圳指瑞威科技有限公司 | A kind of ESD protection structure and its modeling method based on fingerprint sensor |
| CN110795379A (en) * | 2019-10-12 | 2020-02-14 | 广东浪潮大数据研究有限公司 | Double-layer network port electromagnetic compatibility circuit and server |
| CN112822828A (en) * | 2020-12-31 | 2021-05-18 | 成都旭光科技股份有限公司 | Circuit for improving electrostatic protection capability of WiFi module |
-
2008
- 2008-10-24 CN CNA2008101712031A patent/CN101399882A/en active Pending
Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104461107A (en) * | 2013-09-24 | 2015-03-25 | 胜华科技股份有限公司 | Touch panel |
| CN103515945A (en) * | 2013-10-23 | 2014-01-15 | 青岛歌尔声学科技有限公司 | Esd reinforcing circuit |
| WO2016179829A1 (en) * | 2015-05-14 | 2016-11-17 | Texas Instruments Incorporated | Usb controller esd protection apparatus and method |
| JP2018526809A (en) * | 2015-05-14 | 2018-09-13 | 日本テキサス・インスツルメンツ株式会社 | USB controller ESD protection apparatus and method |
| US10424950B2 (en) | 2015-05-14 | 2019-09-24 | Texas Instruments Incorporated | USB controller ESD protection apparatus and method |
| CN107918680A (en) * | 2016-10-08 | 2018-04-17 | 深圳指瑞威科技有限公司 | A kind of ESD protection structure and its modeling method based on fingerprint sensor |
| CN107072131A (en) * | 2017-06-27 | 2017-08-18 | 苏州交运电子科技有限公司 | Electronic equipment static discharge solution and apply its electronic equipment |
| CN107703457A (en) * | 2017-09-26 | 2018-02-16 | 重庆市珞宾信息技术有限公司 | A kind of vehicular power-bottle low power testing device and method |
| CN110795379A (en) * | 2019-10-12 | 2020-02-14 | 广东浪潮大数据研究有限公司 | Double-layer network port electromagnetic compatibility circuit and server |
| CN112822828A (en) * | 2020-12-31 | 2021-05-18 | 成都旭光科技股份有限公司 | Circuit for improving electrostatic protection capability of WiFi module |
| CN112822828B (en) * | 2020-12-31 | 2024-03-15 | 成都旭光科技股份有限公司 | Circuit for improving electrostatic protection capability of WiFi module |
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Open date: 20090401 |