CN2648722Y - Separating modulator-demodulator unit - Google Patents
Separating modulator-demodulator unit Download PDFInfo
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- CN2648722Y CN2648722Y CN 03266000 CN03266000U CN2648722Y CN 2648722 Y CN2648722 Y CN 2648722Y CN 03266000 CN03266000 CN 03266000 CN 03266000 U CN03266000 U CN 03266000U CN 2648722 Y CN2648722 Y CN 2648722Y
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- modulator
- demodulator
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- circuit board
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Abstract
The utility model provides a separated modem, comprising a first circuit board part, a second circuit board part and a connector part that is connected between the first circuit board part and the second circuit board part, wherein, the number of the layers in the second circuit board part is more than that of the layers in the first circuit board. The modem structure of the utility model is suitable for various modems and has the advantages of convenient maintenance, easy design and development and effective reduction of the cost.
Description
Invention field
The utility model relates to data communication equipment, particularly has the modulator-demodulator of split-type structural.
Background technology
Along with the continuous growth of people to the high speed communication demand, to comprising ADSL (asymmetric digital subscriber line), Cable Modem (cable of cable TV modulator-demodulator), power line modem, ISDN (integrated services digital network), VDSL (Very-high-speed Digital Subscriber Line) etc. are also more and more perfect in the design of interior various types of modulator-demodulators.On the other hand, people wish that also its price can be more cheap when the performance to these modulator-demodulators proposes requirements at the higher level.Obviously, reducing production costs also is the target that each modem manufacturer lays siege to.
Various types of modulator-demodulators all are multicore sheet framework at first, and as shown in Figure 1, multicore sheet framework can take bigger wiring board area with respect to single-chip framework shown in Figure 2, cause electromagnetic interference to increase and the rising of modulator-demodulator cost.So after chip research and development, manufacturing capacity maturation, each modem chip manufacturer all releases the modulator-demodulator of single-chip framework.The modulator-demodulator of single-chip framework modulator-demodulator than multicore sheet framework on performance is stable, and cost also is reduced to a certain extent.
At present, reaching the purpose that reduces cost by the components and parts of selecting different company for use also is a kind of means that each modem manufacturer uses always.The shortcoming of this simple method clearly, the one, the required integrated circuit of the modulator-demodulator in the components and parts all will be used ready-made article, the cost modem manufacturer is unable reduces cost voluntarily for this part.The 2nd, the reduced space of cost is little; The 3rd, improve demand by strengthening output to components and parts, realize certain price advantage with the difference of components and parts wholesale price, its influence degree that is subjected to market fluctuation is conspicuous.
Electromagnetic interference is a key factor that influences modem performance.In order to reduce electromagnetic interference to greatest extent, the marketization the circuit board of modulator-demodulator product develop into six present laminates by initial double sided board.The end view of double sided board comprises thick black line is represented among the figure top layer copper foil layer and bottom copper foil layer as shown in Figure 3, and the insulating barrier between top layer copper foil layer and bottom copper foil layer.The end view of six laminates comprises top layer copper foil layer, middle copper foil layer and bottom copper foil layer that thick black line is represented as shown in Figure 4, and the insulating barrier between these copper foil layers.Certainly, the circuit board number of plies is many more, and its price is just high more.The price of six for example domestic laminates can reach 7 times more than of double sided board.
Therefore, many modulator-demodulator manufacturers attempted reducing with the number of plies of minimizing circuit board the manufacturing cost of modulator-demodulator.Yet along with the raising of modem performance, for example on the speed modulator-demodulator product higher than 56K modulator-demodulator, this way is no longer feasible.Had and used that double-sided PCB designs whole modulator-demodulator instead and the example that causes the modulator-demodulator cisco unity malfunction.This is because modulator-demodulator inside requires more and more higher to operational environment, only could satisfy the requirement of modulator-demodulator digital circuit operate as normal greater than two layers multilayer circuit board.ADSL broadband modem in the market is a 6-layer circuit board, the following broadband modem product that the 8-10 layer and even the higher number of plies can occur using.
Content of the present utility model
In sum, existing modulator-demodulator is almost at one's wit's end aspect reducing cost.Therefore provide a kind of new stable and good performance that can guarantee modulator-demodulator, again can be effectively and stably reduce the technology of modulator-demodulator manufacturing cost, user and make that the commercial city is badly in need of beyond doubt, thereby also have market potential.
Therefore, the utility model designer has proposed a kind of split type modulator-demodulator of novelty after the principle of modulator-demodulator and each several part function have been carried out further investigation, can reduce the manufacturing cost of modulator-demodulator.Technology of the present utility model can be suitable for various types of modulator-demodulators, xDSL (comprising DSL modulator-demodulators such as ADSL, VDSL, ADSL+) for example, cable of cable TV modulator-demodulator, power line modem, ISDN, 33.6K or 56K modulator-demodulator.
Comprise according to modulator-demodulator of the present utility model: first circuit board part, second circuit plate portion and be connected in first circuit board and second circuit board between connector part, wherein the circuit board number of plies of second circuit plate portion is greater than the circuit board number of plies of first circuit board part.
According to a kind of preferred version of the present utility model, described first circuit board partly comprises: the DAA part is used for realizing line impedance coupling and Signal Spacing between modulator-demodulator digital processing circuit part and communication line; Power supply input processing section is used for providing protection and anti-interference process to the power supply that inputs to modulator-demodulator; The interface section is used to provide the interface of modulator-demodulator and terminal equipment or computer network.Described second circuit plate portion comprises: the modulator-demodulator digital circuit; Power module is used for the input power source conversion after the described power supply input processing section processes is become the required power supply of described modulator-demodulator digital circuit work; The LED light circuit; And the interface circuit of DAA coupling transformer and modulator-demodulator digital circuit, be used to the coupling transformer and the modulator-demodulator digital circuit of the DAA part in the first circuit board part that interface is provided.
According to another kind of preferred version of the present utility model, described connector is preferably plug connector.In this case, this connector can comprise the combination of metal ferrule and socket, or the combination of metal ferrule-bandlet-metal ferrule etc.And the outside of connector also can be provided with the radome of ground connection.
According to another kind of preferred version of the present utility model, the parallel connected mode that described first circuit board part and second circuit plate portion and connector part can be connected for the side, or first circuit board is partly stacked and pass through the connector part ways of connecting with the second circuit plate portion.
According to another preferred version of the present utility model, in above-mentioned modulator-demodulator, the number of plies of described first circuit board part is preferably two layers.The number of plies of described second circuit plate portion is preferably more than four layers or four layers.
Compared with prior art, the utlity model has following beneficial effect:
The first, easy to maintenance according to modulator-demodulator of the present utility model.In modulator-demodulator in the past, often the part of damaging is exactly according to the part of double sided board technological design, manufacturing in the utility model.Along with the integrated level of modulator-demodulator integrated circuit is more and more higher, many maintenance problems have been caused.One of them is exactly a chip in case be removed once more, just is difficult to be used once more.Although perhaps integrated circuit itself remain, after removing, just can't be welded to once more on other circuit board.Existing modulator-demodulator all is a complete circuit board.The damage of power input part branch, DAA part etc. can cause the change of circuit board outward appearance usually, thereby has to entire circuit blackboard newspaper useless (because can't guarantee that the partly integrated circuit of the digital circuit that is disassembled can be utilized once more).And according to the utility model, flimsy part is independent circuit board, and it is just passable only need to change this part circuit board during maintenance, and modulator-demodulator digital circuit part still can be utilized, and has reduced scrappage.
The second, the modulator-demodulator research and development are easier.In design in the past, all in a circuit board, the main circuit interference source is being close to the digital circuit part that is subject to interference effect to all circuit, and the design research staff has to think at aspects such as board area, performances.For example, enlarge board area and can make the circuit interference source, but cause small product size huge simultaneously, cost rising problem away from digital sensitive circuit.After having adopted split type modem technology of the present utility model, the modulator-demodulator numerical portion can be an one independently, makes on this part circuit design more conveniently, and engineers can concentrate on more energy in the raising of performance.
The 3rd, effectively reduce cost.To adopt the framework of a double sided board and one six laminate to estimate, under same gross area situation, can save about 21.5% on the circuit board cost than the modulator-demodulator of prior art according to modulator-demodulator of the present utility model.Especially when following broadband, high speed modem adopted more multi-layered circuit board to make, it was more remarkable to save cost.In addition, be applied to the circuit of double sided board part, not strict to welding process requirement usually, and integrated circuit is to the welding process requirement height of components and parts, corresponding welding charge is also high.Therefore after having used split type modem technology of the present utility model, the double sided board partial circuit can be gone up streamline separately and weld, assemble according to lower welding, assembly technology requirement, thereby reduces the cost of technology of this part circuit.
Description of drawings
In conjunction with the drawings to the explanation of the utility model embodiment, above-mentioned and other advantage of the present utility model and feature will be easier to be understood.In the accompanying drawing:
Fig. 1 is the schematic diagram of the modulator-demodulator of multicore sheet framework;
Fig. 2 is the schematic diagram of the modulator-demodulator of single-chip framework;
Fig. 3 is the schematic diagram of double layer circuit plate structure;
Fig. 4 is the schematic diagram of multi-layer sheet circuit structure;
Fig. 5 is that the ADSL Modem with Ethernet interface is the schematic diagram of circuit board in the conventional modulator-demodulator of example;
Fig. 6 be the ADSL Modem with Ethernet interface be example according to modem structure schematic diagram of the present utility model.
Preferred implementation
Below preferred implementation of the present utility model is specifically described.
Designer of the present utility model is furtheing investigate the following fact of back discovery to various modem structures and principle, though existing one-board modulator-demodulator is made with multilayer circuit board (for example six layers), wherein there is actual of partial circuit to make with the double layer circuit plate.
ADSL Modem with the existing Ethernet interface is an example, designer of the present utility model finds, although the monoblock circuit board of the ADSL Modem of existing Ethernet interface is six layers, but the circuit board that the part area is wherein arranged requires 4 layers of circuit Copper Foil hollow out with the centre, only keeps two layers Copper Foil up and down.That is to say in the so complete 6-layer circuit board has the part position to make according to double-sided PCB technology.
This part circuit of making by two laminate technologies comprises the circuit of DAA part, power supply inlet side part and the terminal equipment or computer network (for example hub (the HUB)) interface section of modulator-demodulator, shown in the part of the A among Fig. 5.
The DAA circuit part is that modem chip and communication line (for the cable of cable TV modulator-demodulator, are exactly the wire cable part; For power line modem, be exactly power line) between interface circuit, be used for realizing functions such as line impedance coupling and Signal Spacing.High-tension burst is often arranged on the communication lines such as wire cable, and the very strong frequency interferences of signal.Therefore, the useful signal that transmits from communication line can not directly enter back stages of digital treatment circuit, just can enter after must isolating signal and mate through the coupling transformer of DAA circuit.In the time of this part wiring, requiring has certain distance between lead and the lead.Equally, below this part circuit, can not there be the Copper Foil that links to each other with back stages of digital treatment circuit, otherwise, high reject signal can even puncture insulating barrier and directly enters into back stages of digital treatment circuit equally by the space electromagnetic coupling effect, causes the integrated circuit cisco unity malfunction of back or destroyed.Therefore, this just requires this part zone with four layers of Copper Foil hollow out in the middle of the 6-layer circuit board, and only keeps outmost two-layer Copper Foil up and down, and is connected with back stages of digital treatment circuit by a coupling transformer.
On the other hand, the power supply in the incoming modem only can directly offer back stages of digital treatment circuit in the processing of having passed through interference protection measure and after having passed through voltage stabilizing circuit.This part circuit equally will be according to the double sided board PROCESS FOR TREATMENT.
Terminal device interface part typical case is computer interface in this way, and the design principle of its circuit board is also identical with above-mentioned situation.The Ethernet interface coupling transformer is towards the circuit of PC aspect, also can only keep two-layer Copper Foil up and down, and middle copper foil layer is wanted hollow out, and by coupling transformer signal is isolated and coupling, prevents interference and other adverse factor of transmitting from the computer interface outside.
The foregoing circuit unit that the A partial circuit is comprised among Fig. 5 has used the relatively large device of a lot of volumes, and this is because this part circuit need bear the high voltage and the big electric current of certain amount.More and more higher in the integrated level of modem chip own; the modem chip circuit is under the more and more littler situation of area occupied on the circuit board; the ratio of this part circuit area occupied is just more considerable, can account for the area more than 1/4 of whole modem circuit plate usually.
In view of above understanding, designer of the present utility model has proposed a kind of split type modulator-demodulator scheme.This scheme is that A partial circuit among Fig. 5 and B partial circuit are made separately respectively, as two modules, combines by connector then, reaches and is satisfying under the prerequisite of modem performance the purpose that reduces cost.
Fig. 6 has shown the modem structure of the utility model one embodiment, and still the ADSL Modem with Ethernet interface is an example.Comprise two circuit boards altogether.Wherein partly with the less for example two laminate technologies manufacturing of circuit board of the number of plies, this first circuit board is provided with above-mentioned power inleting terminal treatment circuit part, DAA circuit part and ethernet end device interface circuit part to first circuit board.
The DAA circuit part comprises DAA circuit inlet wire interface section and DAA part coupling transformer.DAA circuit inlet wire interface section will be passed through the isolation and the coupling of the coupling transformer of DAA circuit from the useful signal of communication line, just enter the back stages of digital treatment circuit that is arranged on the second circuit plate portion through connector then.
The ethernet end device interface circuit partly comprises ethernet end device (for example computer) interface processing circuit part and Ethernet interface coupling transformer and ESD (electrostatic protection) protective circuit part.Ethernet computer interface treatment circuit part partly carries out being connected with digital circuit (second circuit plate portion) by coupling transformer and esd protection circuit again.Thereby utilize coupling transformer and esd protection circuit the isolation and the coupling of signal, prevent interference and other adverse factor of transmitting from the computer interface outside.
Foregoing circuit unit itself all is the conventional components of modulator-demodulator, and the design of its internal circuit is not main points of the present utility model.These parts can design according to the method for designing of the modem circuit of routine, so no longer this are specifically described in this specification, make those skilled in the art be difficult for understanding substantive distinguishing features of the present utility model in order to avoid state too much details.
Connector part shown in Fig. 6 provides being connected of signal and power supply for first circuit board I and second circuit board II.It can be conventional connector, comprises for example combination of metal ferrule and socket, or the combination of metal ferrule-bandlet-metal ferrule etc.
Can use or not use the grounded metallic shield cover according to the electromagnetic compatibility national standard of country variant in actual applications.A part of cost can be increased though add the grounded metallic shield cover, design difficulty can be reduced effectively.
Second circuit plate portion shown in Figure 6 mainly comprises digital circuit power module and modulator-demodulator digital circuit.Can also comprise the LED light circuit part in addition, and the interface circuit of DAA coupling transformer and modulator-demodulator digital circuit etc.The modulator-demodulator digital circuit comprises that the integrated circuit of modulator-demodulator itself and computer interface integrated circuit also have SRAM etc.The digital circuit power module generally adopts linear voltage regulator (using the LDO regulator block usually) according to the difference of the employed power-supply system of different type of modulation demodulator.Linear voltage regulator integrated circuit regulator block also plays the effect of similar coupling transformer except suitable operating voltage is provided, can provide to a certain degree protection to back stages of digital circuit, reduces the interference of external power source to the digital circuit of back.Certainly, power module also can adopt for example compound devices such as combination of switching mode and linear voltage regulator.As can be seen, the parts in the foregoing circuit unit in the second circuit plate portion mainly comprise the existing integrated circuits chip.Correspondingly, the circuit board number of plies of second circuit plate portion also can be determined according to the needed number of plies of assurance modem chip operate as normal.
In addition, in the embodiment shown in fig. 6, the interface circuit of DAA coupling transformer and modulator-demodulator digital circuit is used to the coupling transformer and the modulator-demodulator digital circuit of the DAA part in the first circuit board part that interface is provided.This part analog circuit preferably uses the board layer numeral system the same with the modulator-demodulator digital circuit to make.This is because after having passed through coupling transformer, the signal here can not produce harmful effect to late-class circuit.And this part analog circuit reality is made of several resistance, electric capacity, and volume is little, also need not make by two laminates separately.
As can be seen, inner characteristic of the present utility model is exactly the single circuit board of traditional modem is required the difference of the circuit board number of plies in design according to each circuit unit and to be divided into double layer circuit plate and two circuit boards of multilayer circuit board.Corresponding circuit unit is placed on respectively on these two circuit boards.Adopt connector to connect between two circuit boards.Utilize this structure, can obtain the aforesaid multiple advantage of the utility model.
Need to prove that the position relation that three parts in the split type modulator-demodulator of the present utility model are first, second circuit board section and connector part can have multiple.For example can make the side and the parallel connected mode of connector part of first, second circuit board section, or it is first, second circuit board section is stacked and by the connector ways of connecting, and electro-magnetic screen layer is set, to provide good electromagnetic shielding to first, second circuit board section.
Above the explanation of execution mode of the present utility model just is used for the utility model is illustrated but not it is limited.Obviously can carry out various modifications and adopt the various means that are equal to each details of above-mentioned execution mode.
For example, be that example illustrates although the utility model is a ADSL Modem with Ethernet interface.But as previously mentioned, the utility model obviously is not limited to the ADSL Modem of Ethernet interface.Modulator-demodulator for other type, may have the unexistent circuit part of ADSL modem, for example may provide the call voice analog module, and modulator-demodulator in the future also may increase for example liquid crystal display LCD etc. of new functional module to 33.6K, 56K modulator-demodulator.But these modulator-demodulators can be to use two laminates also to be to use multi-layer sheet according to its circuit part, and use technology of the present utility model to make.
Therefore, scope of the present utility model is only limited by claims.
Claims (10)
1. split type modulator-demodulator is characterized in that comprising:
The first circuit board part;
The second circuit plate portion, its circuit board number of plies is greater than described first circuit board partial circuit flaggy number; With
Be connected in the connector part between described first circuit board and the second circuit board.
2. modulator-demodulator according to claim 1 is characterized in that,
Described first circuit board partly comprises:
The DAA part is for modulator-demodulator digital circuit and communication line carry out impedance matching and Signal Spacing;
Power supply input processing section provides protection and anti-interference process to the power supply that inputs to modulator-demodulator;
The interface section is used to provide the interface of modulator-demodulator and terminal equipment or network,
Described second circuit plate portion comprises:
The modulator-demodulator digital circuit;
Power module is used for the input power source conversion after the described power supply input processing section processes is become the required power supply of described modulator-demodulator digital circuit work;
The LED indicating circuit; And
The interface circuit of DAA coupling transformer and modulator-demodulator digital circuit is used to the coupling transformer and the modulator-demodulator digital circuit of described DAA part that interface is provided.
3. modulator-demodulator according to claim 2 is characterized in that, described power module is switching mode, parallel connection type or linear voltage regulator or their combination.
4. modulator-demodulator according to claim 1 is characterized in that, described connector is a connector.
5. modulator-demodulator according to claim 4 is characterized in that, described connector is the combination of metal ferrule and socket, or the combination of metal ferrule-bandlet-metal ferrule.
6. modulator-demodulator according to claim 4 is characterized in that, the outer setting of described connector has the radome of ground connection.
7. according to each described modulator-demodulator of claim 1-6, it is characterized in that, described first circuit board part is the parallel connected mode that the side is connected with second circuit plate portion and connector part, or first circuit board is partly stacked and pass through the connector part ways of connecting with the second circuit plate portion.
8. modulator-demodulator according to claim 7 is characterized in that, the number of plies of described first circuit board part is two layers.
9. modulator-demodulator according to claim 8 is characterized in that, the number of plies of described second circuit plate portion is more than four layers or four layers.
10. modulator-demodulator according to claim 7 is characterized in that, described modulator is the xDSL modulator-demodulator, cable of cable TV modulator-demodulator, power line modem, integrated services digital network modulator-demodulator, 33.6K or 56K modulator-demodulator.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 03266000 CN2648722Y (en) | 2003-06-12 | 2003-06-12 | Separating modulator-demodulator unit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 03266000 CN2648722Y (en) | 2003-06-12 | 2003-06-12 | Separating modulator-demodulator unit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2648722Y true CN2648722Y (en) | 2004-10-13 |
Family
ID=34329772
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 03266000 Expired - Fee Related CN2648722Y (en) | 2003-06-12 | 2003-06-12 | Separating modulator-demodulator unit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2648722Y (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110072023A (en) * | 2019-03-30 | 2019-07-30 | 岳西县天鹅电子科技有限公司 | A kind of modem of installation easy to disassemble |
| CN111683185A (en) * | 2020-05-22 | 2020-09-18 | 西安卧龙网络科技有限公司 | Modem convenient to dismouting |
-
2003
- 2003-06-12 CN CN 03266000 patent/CN2648722Y/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110072023A (en) * | 2019-03-30 | 2019-07-30 | 岳西县天鹅电子科技有限公司 | A kind of modem of installation easy to disassemble |
| CN111683185A (en) * | 2020-05-22 | 2020-09-18 | 西安卧龙网络科技有限公司 | Modem convenient to dismouting |
| CN111683185B (en) * | 2020-05-22 | 2021-10-29 | 西安卧龙网络科技有限公司 | Modem convenient to dismouting |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C19 | Lapse of patent right due to non-payment of the annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |