CN101925252A - Wiring method for improving signal quality - Google Patents
Wiring method for improving signal quality Download PDFInfo
- Publication number
- CN101925252A CN101925252A CN 201010245790 CN201010245790A CN101925252A CN 101925252 A CN101925252 A CN 101925252A CN 201010245790 CN201010245790 CN 201010245790 CN 201010245790 A CN201010245790 A CN 201010245790A CN 101925252 A CN101925252 A CN 101925252A
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- Prior art keywords
- wiring
- impedance
- arc
- signal quality
- line
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- 238000000034 method Methods 0.000 title claims abstract description 12
- 230000002860 competitive effect Effects 0.000 abstract 1
- 239000003365 glass fiber Substances 0.000 description 5
- 239000011347 resin Substances 0.000 description 3
- 229920005989 resin Polymers 0.000 description 3
- 238000004458 analytical method Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000005868 electrolysis reaction Methods 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
- 238000001566 impedance spectroscopy Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000004382 potting Methods 0.000 description 1
- 230000011514 reflex Effects 0.000 description 1
- 230000008054 signal transmission Effects 0.000 description 1
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Abstract
The invention provides a wiring method for improving the signal quality, which can solve the problem of great impedance difference of two lines in a differential signal line pair by adopting an arc wiring mode or a wavelike wiring mode on a PCB (Printed Circuit Board), avoid generating cusps which cause incontinuous impedance and adjust the value of an arc radius R by using wiring arc parameters according to a practical wiring space. The arc wiring mode can be adopted to avoid the danger of great impedance difference of the differential pair and solve the problem of incontinuous impedance. The arc wiring or wavelike wiring method can be applied to a computer communication product and other electronic products containing high-speed signals and can improve the signal quality of the products and further enhance the competitive power of the products.
Description
Technical field
The present invention relates to a kind of pcb board circuit design technique field, specifically a kind of wiring method that improves signal quality.
Background technology
Design feature according to pcb board; We will shorten the length of the cabling of and level vertical with edges of boards as far as possible, dwindle the difference of walking line impedence among differential pair or the same group of BUS with this.Along with the upgrading of the chipset in the electronic product, its signal speed also can be more and more higher.When signal speed high in (as greater than 5G) pcb board to a certain degree the characteristic impedance of trace the quality of signal is had very important influence.
The characteristic impedance formula is
Can see that electrolysis constant (Er) value of pcb board material affects the value of impedance.
At present pcb board is configured to the glass grid potting resin.As shown in Figure 1, the black line is a glass fibre, and green is a resin; And the Er value of glass fibre is greater than the Er of resin.
Line 1 among the figure, line 2 are a pair of differential lines among the PCB; When the line 1 of differential signal is walked on glass fibre, when line 2 is not walked on glass fibre, calculate according to formula 1 like this, the impedance of two trace is just inequality, so just can not reflecting fully in the difference of load end, this two bars the difference of transmitting terminal will influence signal transmission quality.
The industry great majority adopt the broken line mode at 10 degree angles to connect up and avoid the generation of above-mentioned situation at present, as shown in Figure 2, though this cabling mode can have been avoided two big risks of single line impedance difference in a pair of differential lines, but occurred another problem again is exactly impedance discontinuous (as shown in Figure 3), signal will reflect when impedance is discontinuous, can influence the quality of signal equally.
10 present degree angle wirings have well solved this problem, but have brought the discontinuous shortcoming of impedance thereupon; Present a lot of signal speeds greater than 5G even situation near 10G under, impedance is discontinuous and the influence signal reflex that causes is more and more obvious.
Summary of the invention
The purpose of this invention is to provide a kind of wiring method that improves signal quality.
The objective of the invention is to realize in the following manner, on pcb board, adopt arc wire laying mode or wave wire laying mode to solve two big problems of line impedence difference of differential signal line centering, and can avoid causing the generation of the discontinuous wedge angle of impedance, the radian parameter of wiring is adjusted radius of the radian R size according to the wiring space of reality.
Excellent effect of the present invention is: connects up with radian and can avoid the big risk of differential pair impedance difference, but the discontinuous problem of resolved impedance spectroscopy again.Arc connects up or the wave wiring method can be applied to the compunication product and other contain in the electronic product of high speed signal, can improve the signal quality of the said goods and then strengthen competitiveness of product.
Description of drawings
Accompanying drawing 1 is the structural representations of two lines of differential signal line centering respectively at parallel coincidence of pcb board glass fibre and not parallel coincidence;
Accompanying drawing 2 is the wire laying mode structural representation that two lines of differential signal line centering adopt broken line;
Accompanying drawing 3 is the analysis schematic diagram to Fig. 2
Accompanying drawing 4 is the structural representation that two lines of differential signal line centering adopt the wave wire laying mode.
The explanation of accompanying drawing 3
The relation of live width and impedance variation after the flex point appears in normal live width and line, shown in formula
W＝S*COSβ
Wherein: the width that the normolineal width of w, s are meant x point place line just line at the width at flex point place,
Formula has illustrated that its live width will change as long as break appears in line, thus cause on same lead in the place that break occurs since live width broaden (s＞w) impedance diminishes, this just explanation the discontinuous situation of impedance can appear on same lead.
Embodiment
Explain below with reference to Figure of description method of the present invention being done.
A kind of wiring method that improves signal quality of the present invention, this method is to adopt arc wire laying mode or wave wire laying mode to solve differential signal line center line 1 and the big problem of line 2 impedance difference on pcb board 1, and can avoid causing the generation of the discontinuous wedge angle of impedance, line 1, the radian parameter of line 2 wirings is adjusted radius of the radian R size according to the wiring space of reality.
Except that the described technical characterictic of specification, be the known technology of those skilled in the art.
Claims (1)
1. wiring method that improves signal quality, it is characterized in that, on pcb board, adopt arc wire laying mode or wave wire laying mode to solve two big problems of line impedence difference of differential signal line centering, and can avoid causing the generation of the discontinuous wedge angle of impedance, the radian parameter of wiring is adjusted radius of the radian R size according to the wiring space of reality.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201010245790 CN101925252A (en) | 2010-08-05 | 2010-08-05 | Wiring method for improving signal quality |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201010245790 CN101925252A (en) | 2010-08-05 | 2010-08-05 | Wiring method for improving signal quality |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN101925252A true CN101925252A (en) | 2010-12-22 |
Family
ID=43339782
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201010245790 Pending CN101925252A (en) | 2010-08-05 | 2010-08-05 | Wiring method for improving signal quality |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN101925252A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105636342A (en) * | 2016-01-01 | 2016-06-01 | 广州兴森快捷电路科技有限公司 | Wiring modes for printed circuit board |
| CN107484345A (en) * | 2017-09-21 | 2017-12-15 | 郑州云海信息技术有限公司 | A kind of PCB layout method for the impedance matching for improving differential signal line |
| CN112911802A (en) * | 2020-12-25 | 2021-06-04 | 无锡市同步电子科技有限公司 | Differential signal line wiring method of twisted pair-like staggered layer structure |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1980532A (en) * | 2005-11-30 | 2007-06-13 | 英业达股份有限公司 | Arc-shape winding system and method |
| CN201307199Y (en) * | 2008-09-16 | 2009-09-09 | 上海广电住金微电子有限公司 | Wiring structure of accurate differential pair impedor of liquid crystal driving panel |
| CN101543142A (en) * | 2007-06-06 | 2009-09-23 | 日本梅克特隆株式会社 | Printed wiring board |
-
2010
- 2010-08-05 CN CN 201010245790 patent/CN101925252A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1980532A (en) * | 2005-11-30 | 2007-06-13 | 英业达股份有限公司 | Arc-shape winding system and method |
| CN101543142A (en) * | 2007-06-06 | 2009-09-23 | 日本梅克特隆株式会社 | Printed wiring board |
| CN201307199Y (en) * | 2008-09-16 | 2009-09-09 | 上海广电住金微电子有限公司 | Wiring structure of accurate differential pair impedor of liquid crystal driving panel |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105636342A (en) * | 2016-01-01 | 2016-06-01 | 广州兴森快捷电路科技有限公司 | Wiring modes for printed circuit board |
| CN107484345A (en) * | 2017-09-21 | 2017-12-15 | 郑州云海信息技术有限公司 | A kind of PCB layout method for the impedance matching for improving differential signal line |
| CN112911802A (en) * | 2020-12-25 | 2021-06-04 | 无锡市同步电子科技有限公司 | Differential signal line wiring method of twisted pair-like staggered layer structure |
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| C06 | Publication | ||
| PB01 | Publication | ||
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| C02 | Deemed withdrawal of patent application after publication (patent law 2001) | ||
| WD01 | Invention patent application deemed withdrawn after publication |
Open date: 20101222 |