CN104125177A - Design method of differential line winding compensation - Google Patents
Design method of differential line winding compensation Download PDFInfo
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- CN104125177A CN104125177A CN201410340381.8A CN201410340381A CN104125177A CN 104125177 A CN104125177 A CN 104125177A CN 201410340381 A CN201410340381 A CN 201410340381A CN 104125177 A CN104125177 A CN 104125177A
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- 238000000034 method Methods 0.000 title claims abstract description 17
- 238000013461 design Methods 0.000 title abstract description 14
- 238000004804 winding Methods 0.000 title abstract description 5
- 238000004088 simulation Methods 0.000 abstract description 4
- 238000012795 verification Methods 0.000 abstract 1
- 230000008878 coupling Effects 0.000 description 3
- 238000010168 coupling process Methods 0.000 description 3
- 238000005859 coupling reaction Methods 0.000 description 3
- 230000005540 biological transmission Effects 0.000 description 2
- 238000004891 communication Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000012545 processing Methods 0.000 description 2
- 230000000644 propagated effect Effects 0.000 description 2
- 230000005855 radiation Effects 0.000 description 2
- 230000007812 deficiency Effects 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
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Abstract
The invention provides a design method of differential line winding compensation. 180-degree phase difference is kept for two lines in a mechanism, namely the required current amplitudes are identical, but the directions are opposite. Near-end segment winding compensation is performed at the positions where phase positions at the signal source end the signal output end are easily mismatched. Compared with the prior art, a small protrusion line-along compensation mode recommended by Intel is traditionally adopted, it is found that a large segment near compensation mode is performed at the signal source end through special case signal simulation and strike board verification, the signal attenuation is effectively reduced and the product quality is improved although caused source-end impedance is large. The design method is suitable for signal differential length compensation so as to ensure application of layout design identical to the differential length. In addition, the design method further has the advantages of being reasonable I design, simple in structure, easy to process, convenient to use and the like and accordingly has good use value.
Description
Technical field
The present invention relates to communication information technical field, specifically a kind of method for designing of differential lines coiling compensation.
Background technology
Tradition differential lines coiling compensation way, is meeting on the isometric basis of difference length, minimizes the loose coupling district between inner two lines of differential pair, thereby falls low-impedance discontinuity.
But the shortcoming of this kind of design is: because winding portion coupling is tighter, can cause signal propagation path separated, be that low frequency component in signal is propagated along coiling, high fdrequency component is directly propagated along the coupling capacitance of winding department, can cause like this phase mismatch between two lines in differential lines, cause difference loss waveform generation resonance point, and this resonance point differential mode energy is less just, common mode energy larger part.Cause signal attenuation larger, EMI emits high levels of radiation, and has had influence on product quality.
Summary of the invention
The object of the invention is to overcome the deficiencies in the prior art, a kind of method for designing of differential lines coiling compensation is provided.
Technical scheme of the present invention realizes in the following manner, in its structure, two lines will be kept to the phase difference of 180 degree, require current amplitude identical, but aspect is contrary.
Above-mentioned in signal source, the easy mismatch of the phase place of signal output part place carries out the large segment coiling of near-end compensation.
Advantage of the present invention is:
The method for designing of a kind of differential lines coiling compensation of the present invention compared to the prior art, the little projection compensation way along the line that tradition adopts Intel to recommend, through certain special project signal simulation and the checking that re-packs, discovery is carried out large segment compensation way nearby in signal source, though cause source impedance larger, but will effectively reduce signal attenuation, improve the quality of products.This design is applicable to signal differential length compensation, to guarantee difference layout equal in length design application, and the present invention also have reasonable in design, simple in structure, be easy to processing, the feature such as easy to use, thereby, there is good use value.
Embodiment
Below the method for designing of a kind of differential lines coiling compensation of the present invention is described in detail below.
The method for designing of a kind of differential lines coiling compensation of the present invention, it in its structure, is the loss that reduces differential signal, we adopt in signal source, and the easy mismatch of the phase place of signal output part place carries out the large segment coiling of near-end compensation, and the method is better than being divided into segment along line compensation method.
By emulation, find that its difference loss is without occurring resonance point, significantly differential mode turns common mode energy generation.
From emulation and the measured waveform of layout coiling correcting front and back, in source, adopt large segment coiling compensation to be better than little projection compensation way along the line.
By theory analysis, analogue simulation and the actual measurement checking that re-packs, propose a kind of improved difference coiling compensation way, and this mode can not only meet the isometric requirement of difference, can reduce signal loss along the line simultaneously, promotes signal quality.
Differential lines antijamming capability is strong, and signal to noise ratio is high, and radiation is little, and the large many merits that waits of bandwidth capacity, so all choose differential lines as communication mode in current high-speed link design.Differential lines is compared with single wire transmission, why has numerous advantages, is because it adopts differential transmission mode.Two lines will keep the phase difference of 180 degree, require current amplitude identical, but aspect are contrary, if two line lengths in differential pair are not isometric, can cause signal at two above-the-line promotion time delay difference and phase mismatchs, can cause that like this signal differential transforms to common mode energy, cause signal amplitude decay.Therefore, in layout design, must do difference coiling compensation, isometric to guarantee two lines in differential lines as far as possible.
Concerning difference coiling compensation, the little projection compensation way along the line that tradition adopts Intel to recommend, through certain special project signal simulation and the checking that re-packs, discovery is carried out large segment compensation way nearby in signal source, though cause source impedance larger, but will effectively reduce signal attenuation, improve the quality of products.This design is applicable to signal differential length compensation, with the layout design application that guarantees that difference is equal in length.
Its processing and fabricating of method for designing of a kind of differential lines coiling compensation of the present invention is very simple and convenient, can process shown in to specifications.
Except the technical characterictic described in specification, be the known technology of those skilled in the art.
Claims (2)
1. a method for designing for differential lines coiling compensation, is characterized in that two lines to keep the phase difference of 180 degree require current amplitude identical, but aspect to be contrary.
2. the method for designing of a kind of differential lines coiling compensation according to claim 1, is characterized in that in signal source, and the easy mismatch of the phase place of signal output part place carries out the large segment coiling of near-end compensation.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410340381.8A CN104125177A (en) | 2014-07-17 | 2014-07-17 | Design method of differential line winding compensation |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410340381.8A CN104125177A (en) | 2014-07-17 | 2014-07-17 | Design method of differential line winding compensation |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN104125177A true CN104125177A (en) | 2014-10-29 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201410340381.8A Pending CN104125177A (en) | 2014-07-17 | 2014-07-17 | Design method of differential line winding compensation |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104978298A (en) * | 2015-06-24 | 2015-10-14 | 浪潮电子信息产业股份有限公司 | Design method for high-speed interconnection terminal matching |
| CN108733956A (en) * | 2018-05-30 | 2018-11-02 | 郑州云海信息技术有限公司 | A method of impedance discontinuity at optimization high-speed link capacitance |
| CN109308391A (en) * | 2018-09-20 | 2019-02-05 | 郑州云海信息技术有限公司 | A kind of method for compensating signal and system for common mode and differential mode conversion |
-
2014
- 2014-07-17 CN CN201410340381.8A patent/CN104125177A/en active Pending
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104978298A (en) * | 2015-06-24 | 2015-10-14 | 浪潮电子信息产业股份有限公司 | Design method for high-speed interconnection terminal matching |
| CN108733956A (en) * | 2018-05-30 | 2018-11-02 | 郑州云海信息技术有限公司 | A method of impedance discontinuity at optimization high-speed link capacitance |
| CN108733956B (en) * | 2018-05-30 | 2021-11-02 | 郑州云海信息技术有限公司 | Method for optimizing impedance discontinuity at high-speed link capacitor |
| CN109308391A (en) * | 2018-09-20 | 2019-02-05 | 郑州云海信息技术有限公司 | A kind of method for compensating signal and system for common mode and differential mode conversion |
| CN109308391B (en) * | 2018-09-20 | 2022-02-18 | 郑州云海信息技术有限公司 | Signal compensation method and system for common mode and differential mode conversion |
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Application publication date: 20141029 |