CN203193684U - LVDS circuit and PCB used for mobile terminal - Google Patents
LVDS circuit and PCB used for mobile terminal Download PDFInfo
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- CN203193684U CN203193684U CN 201220509867 CN201220509867U CN203193684U CN 203193684 U CN203193684 U CN 203193684U CN 201220509867 CN201220509867 CN 201220509867 CN 201220509867 U CN201220509867 U CN 201220509867U CN 203193684 U CN203193684 U CN 203193684U
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Abstract
The utility model provides an LVDS circuit for a mobile terminal. According to the LVDS circuit used for the mobile terminal of the utility model, a resistor reservation method is adopted; and general resistors or resistor assemblies are adopted to replace a common-mode filter. When asymmetry in differential signal pair wiring and dislocation of a driver occur, a filter is adopted to suppress common mode noise in the prior art, as a result, problems of complexity in circuit structure and high cost brought by the above method can be raised, while, with the LVDS circuit for the mobile terminal of the utility model adopted, the above problems can be solved. The LVDS circuit provided by the utility model is advantageous in simplicity in circuit structure and low cost, and is suitable for any mobile terminals adopting LVDS interface technology.
Description
Technical field
The utility model relates to circuit field, relates to a kind of LVDS circuit and pcb board for portable terminal in particular.
Background technology
Along with the continuous development of science and technology, Low Voltage Differential Signal interface (LVDS) relies on advantages such as its high-speed transfer, low-power consumption, low noise and low cost, is widely applied in each electronic product.Especially in High Speed System inside, System Backplane interconnection and cable transmission were used, the application of driver, receiver, transceiver, parallel-to-serial converter and other LVDS devices was just increasingly extensive.
Usually, the portable terminal mainboard adopts LVDS as the high speed data transfer mode Low Voltage Differential Signal to be transmitted, as MIPI DSI, MIPI CSI, HDMI, MHL etc., wherein, Low Voltage Differential Signal utilizes low-down voltage swing to carry out transfer of data by printed circuit board (PCB) difference cabling, can realize the transmission speed of hundreds of Mbit/s even last Gbit/s.Because the transmission means that it adopts low driving and low current can realize low noise and low-power consumption.
And in actual signal transmission, owing to the reasons such as asymmetric, driver dislocation of differential signal to cabling, make the differential signal distortion be converted into common-mode signal, thereby form noise.In the prior art, at the problems referred to above, adopt the extra filter of increase that these common-mode noises are suppressed usually, but the complicated cost height of the circuit of filter.
The utility model content
In view of this, the utility model provides a kind of LVDS circuit for portable terminal, has solved effectively that the available technology adopting filter suppresses common-mode noise and the high problem of circuit complexity, cost brought.
For achieving the above object, the utility model provides following technical scheme:
A kind of LVDS circuit for portable terminal is applied to differential signal transmission, comprises at least one resistor group, and each described resistor group comprises first resistance and second resistance,
A signal output part of differential signal links to each other with an input of external differential signal equipment by described first resistance, and another signal output part of described differential signal links to each other with another input of described external differential signal equipment by described second resistance.
Preferably, described first resistance and described second resistance are resistance or the resistor chain that resistance equates.
Preferably, described external differential signal equipment is specially low-voltage differential signal driver or receiver.
Preferably, described first resistance and described second resistance are resistance or the resistor chain according to default encapsulation standard packaging.
Preferably, described default encapsulation standard is 0201 encapsulation standard.
A kind of pcb board is packaged with above-mentioned any LVDS circuit.
Via above-mentioned technical scheme as can be known, compared with prior art, the utility model provides a kind of LVDS circuit for portable terminal, adopt the mode of reserving resistance, by substituting common-mode filter with general resistance or exclusion, effectively solved in the prior art differential signal asymmetric to cabling taking place, during the driver dislocation, the circuit complexity that adopts filter to suppress common-mode noise and bring, the problem that cost is high, a kind of LVDS circuit structure for portable terminal that the utility model provides is simple, cost is low, is applicable to the portable terminal of any employing LVDS interfacing.
Description of drawings
In order to be illustrated more clearly in the utility model embodiment 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 embodiment of the present utility model; for this area professional and technical personnel; under the prerequisite of not paying creative work, obtain other accompanying drawing according to the accompanying drawing that provides, all belong to the scope of the utility model protection.
The schematic diagram of a specific embodiment of a kind of LVDS circuit for portable terminal that Fig. 1 provides for the utility model;
A kind of LVDS circuit resistance for portable terminal that Fig. 2 provides for the utility model is put the size schematic diagram on circuit board;
The package dimension schematic diagram of a kind of industry standard that Fig. 3 provides for the utility model.
Embodiment
Below in conjunction with the accompanying drawing among the utility model embodiment, the technical scheme among the utility model embodiment is clearly and completely described, obviously, described embodiment only is the utility model part embodiment, rather than whole embodiment.Based on the embodiment in the utility model, this area professional and technical personnel is not making the every other embodiment that obtains under the creative work prerequisite, all belongs to the scope of the utility model protection.
For quote and know for the purpose of, the hereinafter explanation of the technical term of Shi Yonging, write a Chinese character in simplified form or abridge and be summarized as follows:
LVDS: the Low Voltage Differential Signal technical interface, Low Voltage Differential Signaling is used for high speed data transfer.
MIPI: mobile industry processor interface alliance, Mobile Industry Processor Interface, this alliance is intended to define and promote the open standard for mobile Application Processor Interface.
MIPI DSI: be that wherein, DSI is Display Serial Interface by the HSSI High-Speed Serial Interface that is used for transfer of data between mobile application processor and the demonstration module of MIPI alliance definition.
MIPI CSI: be the HSSI High-Speed Serial Interface that is used for transfer of data between mobile application processor and the shooting module by the definition of MIPI alliance, wherein, the English full name of CSI is Camera Serial Interface.
HDMI: high-definition digital multimedia interface, High Definition Multimedia Interface.
MHL: connect the audio-visual standard interface of portable consumer electronic device, Mobile High-Definition Link.
Embodiment
The utility model embodiment provides a kind of LVDS circuit for portable terminal, be applied to differential signal transmission, comprise at least one resistor group, each described resistor group comprises first resistance and second resistance, wherein, first end of first resistance links to each other with a signal output part of external differential signal, second end of first resistance links to each other with an input of external differential signal equipment, first end of second resistance links to each other with another signal output part of external differential signal, and second end of second resistance links to each other with another input of external differential signal equipment.
Need to prove that " first " and " second " just in order to distinguish the device of same classification, for example, first end of resistance and second end are appreciated that into an end and the other end of resistance.Preferably, described first resistance and described second resistance are resistance or the resistor chain that resistance equates.Described external differential signal equipment is specially low-voltage differential signal driver or receiver.
In the LVDS high speed transmission of signals, data rate reaches Gbit/s, and clock frequency also arrives the hundreds of megahertz.Rising edge is fallen the problem that is easy to generate overshoot in the pS level unit, and then forms electromagnetic interference, can suitably slow down rising edge by reserving resistance, makes that electromagnetic interference drops to minimum when high-speed transfer.Namely when taking place differential signal to asymmetric, the driver dislocation of cabling, can substitute the common-mode noise filter mode by resistance and suppress electromagnetic interference.A kind of LVDS circuit structure for portable terminal that the utility model provides is simple, and cost is low, is applicable to the portable terminal of any employing LVDS interfacing.
See also Fig. 1, the schematic diagram of a specific embodiment of a kind of LVDS circuit for portable terminal that provides for the utility model, this embodiment is example with three pairs of differential signals, the operation principle of a kind of LVDS circuit for portable terminal that the utility model is provided is introduced, wherein, R1, R2, R3, R4, R5, R6 are three pairs of wire jumper resistance, X1 is the connector circuit symbol of external differential signal equipment, wherein, described external differential signal equipment can be low-voltage differential signal driver or receiver, but is not limited to this.
Wherein, D0+/D0-, CLK+/CLK-, D1+/D1-are respectively three pairs of printed circuit board (PCB) Low Voltage Differential Signals to signal network.This circuit is existing with a pair of clock differential signal (CLK+/CLK-); two couples of data differential signal (D0+/D0-; D1+/D1-) explain, the circuit that the utility model provides can extend to those to have on the how right Low Voltage Differential Signal equipment, all in the protection range of this circuit requirement.
Concrete, the end of data differential signals D0-links to each other with an end of resistance R 1, and the other end of resistance R 1 links to each other with 2 pin of external differential signal equipment connector X1; The end of data differential signals D0+ links to each other with an end of resistance R 2, and the other end of resistance R 2 links to each other with 3 pin of external differential signal equipment connector X1; The end of clock differential signal CLK-links to each other with an end of resistance R 3, and the other end of resistance R 3 links to each other with 5 pin of external differential signal equipment connector X1; The end of clock differential signal CLK+ links to each other with an end of resistance R 4, and the other end of resistance R 4 links to each other with 6 pin of external differential signal equipment connector X1; The end of data differential signals D1-links to each other with an end of resistance R 5, and the other end of resistance R 5 links to each other with 8 pin of external differential signal equipment connector X1; The end of data differential signals D1+ links to each other with an end of resistance R 6, and the other end of resistance R 6 links to each other with 9 pin of external differential signal equipment connector X1.
Preferably, resistance can be carried out the printed circuit board (PCB) package design according to default encapsulation standard, and then, when printed circuit board (PCB) does not need to use common-mode filter, just can use general resistance or exclusion instead common-mode filter is replaced.
Concrete, see also Fig. 2 and Fig. 3, wherein, a kind of LVDS circuit resistance for portable terminal that Fig. 2 provides for the utility model is put the size schematic diagram on circuit board, the package dimension schematic diagram of a kind of industry standard that Fig. 3 provides for the utility model.
Wherein, resistance R 1, R2, R3, R4, R5, R6 adopt 0201 package dimension, put side by side according to combination in twos shown in the left figure of Fig. 2 on the printed circuit board (PCB).According to the industry standard package dimension, as figure shows, two 0201 resistance is placed in the package dimension (as shown in Figure 3) of the area size (shown in the right figure of Fig. 2), two path common-mode filter sizes and the two path exclusions that need on the printed circuit board (PCB) side by side, and the three can mutual alternative at same printed circuit board (PCB).Namely when taking place differential signal to asymmetric, the driver dislocation of cabling, can substitute the common-mode noise filter mode by resistance and suppress electromagnetic interference.
Need to prove, the encapsulation standard that present embodiment adopts just illustrates the principle of the LVDS circuit that the utility model provides for example, be not limited to this packaged type, accordingly, if R1, R2, R3, R4, R5, R6 adopt other package dimensions, according to the industry standard size, also can realize in this way replacing common-mode filter with general resistance or exclusion equally.
Except this, the utility model also provides a kind of pcb board, comprises the LVDS circuit in above-described embodiment.
Above-mentioned explanation to the embodiment that provides makes this area professional and technical personnel can realize or use the utility model.Multiple modification to these embodiment will be apparent concerning those skilled in the art, and defined General Principle can realize under the situation that does not break away from spirit or scope of the present utility model in other embodiments herein.Therefore, the utility model will can not be restricted to these embodiment shown in this article, but principle and the features of novelty the wideest consistent scope that provides with this paper will be provided.
Claims (6)
1. a LVDS circuit that is used for portable terminal is applied to differential signal transmission, it is characterized in that comprise at least one resistor group, each described resistor group comprises first resistance and second resistance,
A signal output part of differential signal links to each other with an input of external differential signal equipment by described first resistance, and another signal output part of described differential signal links to each other with another input of described external differential signal equipment by described second resistance.
2. LVDS circuit according to claim 1 is characterized in that, described first resistance and described second resistance are resistance or the resistor chain that resistance equates.
3. LVDS circuit according to claim 1 is characterized in that, described external differential signal equipment is low-voltage differential signal driver or receiver.
4. LVDS circuit according to claim 2 is characterized in that, described first resistance and described second resistance are resistance or the resistor chain according to default encapsulation standard packaging.
5. LVDS circuit according to claim 4 is characterized in that, described default encapsulation standard is 0201 encapsulation standard.
6. a pcb board is characterized in that, is packaged with any LVDS circuit among the aforesaid right requirement 1-5.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220509867 CN203193684U (en) | 2012-09-29 | 2012-09-29 | LVDS circuit and PCB used for mobile terminal |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220509867 CN203193684U (en) | 2012-09-29 | 2012-09-29 | LVDS circuit and PCB used for mobile terminal |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203193684U true CN203193684U (en) | 2013-09-11 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201220509867 Expired - Fee Related CN203193684U (en) | 2012-09-29 | 2012-09-29 | LVDS circuit and PCB used for mobile terminal |
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|---|---|
| CN (1) | CN203193684U (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103983856A (en) * | 2014-05-09 | 2014-08-13 | 京东方科技集团股份有限公司 | Automatic detection equipment and method of low voltage differential signal interface matched resistor |
| CN104134918A (en) * | 2014-07-29 | 2014-11-05 | 浪潮电子信息产业股份有限公司 | Method for changing characteristic impedance of signal transmission link |
| CN104980679A (en) * | 2014-04-14 | 2015-10-14 | 亚德诺半导体集团 | Pure differential signal based MIPI DSI/CSI-2 receiver systems |
| CN103686186B (en) * | 2013-12-27 | 2017-01-18 | 龙迅半导体（合肥）股份有限公司 | Data transmission platform |
-
2012
- 2012-09-29 CN CN 201220509867 patent/CN203193684U/en not_active Expired - Fee Related
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103686186B (en) * | 2013-12-27 | 2017-01-18 | 龙迅半导体（合肥）股份有限公司 | Data transmission platform |
| CN104980679A (en) * | 2014-04-14 | 2015-10-14 | 亚德诺半导体集团 | Pure differential signal based MIPI DSI/CSI-2 receiver systems |
| CN104980679B (en) * | 2014-04-14 | 2018-09-07 | 亚德诺半导体集团 | MIPI DSI/CSI-2 receiver systems based on pure differential signal |
| CN103983856A (en) * | 2014-05-09 | 2014-08-13 | 京东方科技集团股份有限公司 | Automatic detection equipment and method of low voltage differential signal interface matched resistor |
| US9465062B2 (en) | 2014-05-09 | 2016-10-11 | Boe Technology Group Co., Ltd. | Device and method for automatically detecting low voltage differential signal interface matching resistor |
| CN104134918A (en) * | 2014-07-29 | 2014-11-05 | 浪潮电子信息产业股份有限公司 | Method for changing characteristic impedance of signal transmission link |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20130911 Termination date: 20180929 |
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| CF01 | Termination of patent right due to non-payment of annual fee |