CN201657492U - Printed circuit board - Google Patents
Printed circuit board Download PDFInfo
- Publication number
- CN201657492U CN201657492U CN2010201671960U CN201020167196U CN201657492U CN 201657492 U CN201657492 U CN 201657492U CN 2010201671960 U CN2010201671960 U CN 2010201671960U CN 201020167196 U CN201020167196 U CN 201020167196U CN 201657492 U CN201657492 U CN 201657492U
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- width
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- signal line
- secondary signal
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Abstract
The utility model provides a printed circuit board which comprises a wiring layer and a differential signal pair, wherein the differential signal pair comprises a first signal wire and a second signal wire; the first signal wire is configured on the wiring layer and provided with a plurality of bending parts; the bending parts of the first signal wire have a first width, sections of the first signal wire beyond the bending parts have a second width, and the first width is larger than the second width; the second signal wire is configured on the wiring layer, substantially parallel to the sections of the first signal wire beyond the bending parts and provided with a plurality of corresponding parts respectively corresponding to the bending parts; the corresponding parts of the second signal wire have a third width, sections of the second signal wire have a fourth width beyond the corresponding parts, and the third width is larger than the fourth width.
Description
Technical field
The utility model relates to a kind of printed circuit board (PCB), and is particularly related to a kind of right printed circuit board (PCB) of differential signal that has.
Background technology
Differential transfer is the technology of a kind of signal transmission, is different from the way of a traditional ground wire of signal line collocation, and differential transfer is transmission signals on two signal line, wherein the amplitude of the signal that transmits of this two signal line equate and phase place opposite.Compared to conventional transportation method, differential transfer has antijamming capability and by force, effectively suppresses electromagnetic interference (Electromagnetic Interference is called for short: EMI) and advantage such as sequential accurate positioning.
Fig. 1 is the partial top view of existing a kind of printed circuit board (PCB).As shown in Figure 1, in order to make the holding wire 50 that transmits differential signal and the length coupling of holding wire 60, wherein a signal line 50 is designed to have the entire length of a plurality of bending parts 52 with increase holding wire 50.Yet, can increase line-spacing between holding wire 50 and the holding wire 60 at bending part 52 whereabouts, make holding wire 50 and holding wire 60 different, and produced the unmatched problem of impedance in impedance and other regional impedance of bending part 52 regions.
The utility model content
The utility model provides a kind of printed circuit board (PCB), can improve differential signal to the unmatched problem of impedance.
The utility model proposes a kind of printed circuit board (PCB), comprise that wiring layer and differential signal are right.Differential signal is to comprising first holding wire and secondary signal line.First holding wire is disposed on the wiring layer and has a plurality of bending parts, and wherein first holding wire has first width at bending part, and the line segment of first holding wire beyond bending part has second width, and first width is greater than second width.The secondary signal line is disposed on the wiring layer and is parallel to the line segment of first holding wire beyond bending part in fact, and has an a plurality of corresponding portion that corresponds respectively to bending part, wherein the secondary signal line has the 3rd width in corresponding portion, the line segment of secondary signal line beyond corresponding portion has the 4th width, and the 3rd width is greater than the 4th width.
In an embodiment of the present utility model, the first above-mentioned width equals the 3rd width in fact.
In an embodiment of the present utility model, the second above-mentioned width equals the 4th width in fact.
In an embodiment of the present utility model, have first distance between above-mentioned bending part and the secondary signal line, have second distance between the line segment of first holding wire beyond the bending part and the secondary signal line, first apart from greater than second distance.
In an embodiment of the present utility model, each above-mentioned bending part comprises parallel-segment and two tilting sections.Parallel-segment is parallel to the secondary signal line in fact.Two tilting sections are connected to the two ends of parallel-segment and favour the secondary signal line, and are connected in the line segment of first holding wire beyond bending part.
In an embodiment of the present utility model, the live width of above-mentioned parallel-segment and two tilting sections is all first width, and corresponding parallel-segment of the length of each the corresponding portion on the secondary signal line and two tilting sections are along the air line distance of first holding wire.
In an embodiment of the present utility model, each above-mentioned bending part comprises parallel-segment, two first tilting sections, two vertical sections and two second tilting sections.Parallel-segment is parallel to the secondary signal line in fact.Two first tilting sections are connected to the two ends of parallel-segment and favour the secondary signal line.Two vertical sections are connected to two first tilting sections and in fact perpendicular to the secondary signal line.Two second tilting sections are connected to two vertical sections and favour the secondary signal line, and are connected in the line segment of first holding wire beyond bending part.
In an embodiment of the present utility model, the live width of the parallel-segment of above-mentioned bending part is first width, the live width of two first tilting sections, two vertical sections and two second tilting sections is second width, the length of the corresponding parallel-segment of the length of each the corresponding portion on the secondary signal line.
Based on above-mentioned, the width of the bending part of first holding wire of the present utility model is greater than the width of first other line segment of holding wire, and the width of the corresponding portion of secondary signal line is greater than the width of other line segment of secondary signal line.By this, differential signal is in the impedance of bending part with place, corresponding portion place, can have small distance and minimizing to some extent because bending part and corresponding portion have between big width and bending part and the corresponding portion, to improve the unmatched problem of impedance.
For above-mentioned feature and advantage of the present utility model can be become apparent, embodiment cited below particularly, and conjunction with figs. is described in detail below.
Description of drawings
Fig. 1 is the partial top view of existing a kind of printed circuit board (PCB).
Fig. 2 is the partial top view of the printed circuit board (PCB) of the utility model one embodiment.
Fig. 3 is the partial top view of the printed circuit board (PCB) of another embodiment of the utility model.
The main element symbol description:
50,60: holding wire 52,122,222: bending part
100,200: printed circuit board (PCB) 110: wiring layer
120,220: differential signal is to 120a, 220a: first holding wire
120b, 220b: secondary signal line 122a, 222a: parallel-segment
122b, 222b, 222d: tilting section 124,224: corresponding portion
222c: vertical section D1, D2: distance
W1～W8: width
Embodiment
Fig. 2 is the partial top view of the printed circuit board (PCB) of the utility model one embodiment.Please refer to Fig. 2, the printed circuit board (PCB) 100 of present embodiment comprises that wiring layer 110 and differential signal are to 120.Differential signal comprises the first holding wire 120a and secondary signal line 120b to 120, and the first holding wire 120a and secondary signal line 120b are adjacent to be disposed on the wiring layer 110, in order to transmit differential signal.For the first holding wire 120a and secondary signal line 120b are complementary on length, the first holding wire 120a is designed to have a plurality of bending parts 122 to increase by the entire length of the first holding wire 120a.
In the present embodiment, the first holding wire 120a has the line segment of width W 1, the first holding wire 120a beyond bending part 122 at bending part 122 and has width W 2, and width W 1 is greater than width W 2.Secondary signal line 120b is parallel to the line segment of the first holding wire 120a beyond bending part 122 in fact, and has an a plurality of corresponding portion 124 that corresponds respectively to bending part 122, wherein secondary signal line 120b has width W 3 in corresponding portion 124, the line segment of secondary signal line 120b beyond corresponding portion 124 has width W 4, and width W 3 is greater than width W 4.
By this, except bending part 122 and corresponding portion 124 are had the big width, simultaneously can reduce distance between bending part 122 and the corresponding portion 124 because of bending part 122 and corresponding portion 124 have width greatly, to reduce differential signal, improve the unmatched problem of impedance to 120 impedances of locating at bending part 122 and corresponding portion 124 places.
In the present embodiment, width W 1 equals width W 3 in fact, and width W 2 equals width W 4 in fact.In addition, each bending part 122 comprises parallel-segment 122a and two tilting section 122b.Parallel-segment 122a is parallel to secondary signal line 120b in fact.Two tilting section 122b are connected to the two ends of parallel-segment 122a and favour secondary signal line 120b, and are connected in the line segment of the first holding wire 120a beyond bending part 122.Have distance D 1, the first holding wire 120a between parallel-segment 122a and the secondary signal line 120b and between line segment beyond the bending part 122 and secondary signal line 120b, have distance D 2, and distance D 1 is greater than distance D 2.The live width of parallel-segment 122a and two tilting section 122b is all width W 1, and corresponding parallel-segment 122a of the length of each the corresponding portion 124 on the secondary signal line 120b and two tilting section 122b are along the air line distance of the first holding wire 120a.
Specifically, the computing formula of the right impedance of differential signal can be represented as shown in the formula (1):
Z＝80/sqrt(εr)ln[1.9(2h+t)/0.8w+t][1-h/4(h+d+t)] (1)
In formula (1), Z is characteristic impedance (Ω), and ε r is the relative dielectric constant of base material (wiring layer 110), w is the width (in) of holding wire, h is the distance (in) between two ground planes, and t is holding wire thickness (in), and d is the distance (in) between two holding wires.Because the distance D 1 among Fig. 2 is greater than distance D 2, so bending part 122 can be greater than bending part 122 and the value of corresponding portion 124 with exterior domain (as D2 sign place) [1-h/4 (h+d+t)] with the value of [1-h/4 (h+d+t)] of corresponding portion 124 regions (as D1 sign place).The value that so can make bending part 122 and the Z of corresponding portion 124 regions (as D1 sign place) is greater than bending part 122 and the value of corresponding portion 124 with the Z of exterior domain (as D2 sign place), and causes the unmatched phenomenon of impedance.
In order to improve this phenomenon, present embodiment is designed to the width W 1 of bending part 122 greater than the width W 2 and corresponding portion 124 width W 4 with the line segment of exterior domain of bending part 122 with the line segment of exterior domain with the width W 3 of corresponding portion 124, and the value that makes bending part 122 and [1.9 (the 2h+t)/0.8w+t] of corresponding portion 124 regions (as D1 sign place) is less than bending part 122 and the value of corresponding portion 124 with [1.9 (the 2h+t)/0.8w+t] of exterior domain (as D2 sign place).In addition, because the width W 1 of bending part 122 is designed to broad as mentioned above with the width W 3 of corresponding portion 124, therefore can reduce the distance (being D1) between bending part 122 and the corresponding portion 124, and bending part 122 is decreased with [1-h/4 (h+d+t)] of corresponding portion 124 regions (as D1 sign place).
By this, bending part 122 is decreased and comparatively convergence bending part 122 and the value of corresponding portion 124 with the value of the Z of corresponding portion 124 regions (as D1 sign place), to improve the unmatched problem of impedance with the Z of exterior domain (as D2 sign place).
The utility model is not limited the form of bending part, below is illustrated by Fig. 3.Fig. 3 is the partial top view of the printed circuit board (PCB) of another embodiment of the utility model.Please refer to Fig. 3, in the present embodiment, each bending part 222 of the first holding wire 220a comprises parallel-segment 222a, two tilting section 222b, two vertical section 222c and two tilting section 222d.Parallel-segment 222a is parallel to secondary signal line 220b in fact.Two tilting section 222b are connected to the two ends of parallel-segment 222a and favour secondary signal line 220b.Two vertical section 222c are connected to two tilting section 222b and in fact perpendicular to secondary signal line 220b.Two tilting section 222d are connected to two vertical section 222c and favour secondary signal line 220b, and are connected in the line segment of the first holding wire 220a beyond bending part 222.The live width of the parallel-segment 222a of bending part 222 is that the live width of width W 5, two tilting section 222b, two vertical section 222c and two tilting section 222d is a width W 6, the length of the corresponding parallel-segment 222a of the length of each the corresponding portion 224 on the secondary signal line 220b.
Be similar to the printed circuit board (PCB) 100 of Fig. 2, in the printed circuit board (PCB) 200 of Fig. 3, the first holding wire 220a in the width W 5 of the parallel-segment 222a of bending part 222 greater than the first holding wire 220a in the parallel-segment 222a of bending part 222 width W 6 with the line segment of exterior domain, and secondary signal line 220b in the width W 7 of corresponding portion 224 greater than secondary signal line 220b in corresponding portion 224 width W 8 with the line segment of exterior domain, use and reduce differential signal, improve the unmatched problem of impedance 220 in the impedance of bending part 222 with corresponding portion 224 regions.
In sum, the width of the bending part of first holding wire of the present utility model is greater than the width of first other line segment of holding wire, and the width of the corresponding portion of secondary signal line is greater than the width of other line segment of secondary signal line.By this, differential signal is in the impedance of bending part with place, corresponding portion place, can have small distance and minimizing to some extent because bending part and corresponding portion have between big width and bending part and the corresponding portion, to improve the unmatched problem of impedance.
Though the utility model discloses as above with embodiment; but be not in order to limit the utility model; any those skilled in the art; in not breaking away from spirit and scope of the present utility model; when doing a little change and retouching, so protection range of the present utility model is as the criterion when looking appended the claim person of defining.
Claims (8)
1. a printed circuit board (PCB) is characterized in that, comprising:
One wiring layer;
One differential signal is right, comprising:
One first holding wire, be disposed on the described wiring layer and have a plurality of bending parts, wherein said first holding wire has one first width at described a plurality of bending parts, the line segment of described first holding wire beyond described a plurality of bending parts has one second width, and described first width is greater than described second width; And
One secondary signal line, be disposed on the described wiring layer and be parallel to the line segment of described first holding wire beyond described a plurality of bending parts, and has an a plurality of corresponding portion that corresponds respectively to described a plurality of bending parts, wherein said secondary signal line has one the 3rd width in described a plurality of corresponding portions, the line segment of described secondary signal line beyond described a plurality of corresponding portions has one the 4th width, and described the 3rd width is greater than described the 4th width.
2. printed circuit board (PCB) according to claim 1 is characterized in that, described first width equals described the 3rd width.
3. printed circuit board (PCB) according to claim 1 is characterized in that, described second width equals described the 4th width.
4. printed circuit board (PCB) according to claim 1, it is characterized in that, has one first distance between each described bending part and the described secondary signal line, have a second distance between the line segment of described first holding wire beyond described a plurality of bending parts and the described secondary signal line, described first apart from greater than described second distance.
5. printed circuit board (PCB) according to claim 1 is characterized in that, each described bending part comprises:
One parallel-segment is parallel to described secondary signal line; And
Two tilting sections are connected to the two ends of described parallel-segment and favour described secondary signal line, and are connected in the line segment of described first holding wire beyond described bending part.
6. printed circuit board (PCB) according to claim 5, it is characterized in that, the live width of described parallel-segment and described two tilting sections is all described first width, and corresponding described parallel-segment of the length of each the described corresponding portion on the described secondary signal line and described two tilting sections are along the air line distance of described first holding wire.
7. printed circuit board (PCB) according to claim 1 is characterized in that, each described bending part comprises:
One parallel-segment is parallel to described secondary signal line; And
Two first tilting sections are connected to the two ends of described parallel-segment and favour described secondary signal line;
Two vertical sections are connected to described two first tilting sections and perpendicular to described secondary signal line; And
Two second tilting sections are connected to described two vertical sections and favour described secondary signal line, and are connected in the line segment of described first holding wire beyond described bending part.
8. printed circuit board (PCB) according to claim 7, it is characterized in that, the live width of the described parallel-segment of described bending part is described first width, the live width of described two first tilting sections, described two vertical sections and described two second tilting sections is described second width, the length of the corresponding described parallel-segment of the length of each the described corresponding portion on the described secondary signal line.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010201671960U CN201657492U (en) | 2010-04-20 | 2010-04-20 | Printed circuit board |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010201671960U CN201657492U (en) | 2010-04-20 | 2010-04-20 | Printed circuit board |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201657492U true CN201657492U (en) | 2010-11-24 |
Family
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2010201671960U Expired - Fee Related CN201657492U (en) | 2010-04-20 | 2010-04-20 | Printed circuit board |
Country Status (1)
| Country | Link |
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| CN (1) | CN201657492U (en) |
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104039076A (en) * | 2014-06-17 | 2014-09-10 | 浪潮(北京)电子信息产业有限公司 | Wire wrapping method and system for reducing difference circuit impedance mismatch degree |
| CN105338732A (en) * | 2015-12-09 | 2016-02-17 | 浪潮电子信息产业股份有限公司 | Wire winding method for improving high speed differential signals |
| CN106507583A (en) * | 2016-10-25 | 2017-03-15 | 郑州云海信息技术有限公司 | A kind of signal transmission line, method and system |
| CN108055760A (en) * | 2017-12-29 | 2018-05-18 | 深圳市兴森快捷电路科技股份有限公司 | A kind of isometric compensating impedance matching process of differential pair |
| CN108666722A (en) * | 2017-03-06 | 2018-10-16 | 安立股份有限公司 | High frequency differentiating signal transmission line and signal transmission system |
| CN109379832A (en) * | 2018-09-19 | 2019-02-22 | 中国电子科技集团公司第五十二研究所 | A kind of difference line compensation method improving differential signal anti-interference ability |
| CN109496065A (en) * | 2018-12-30 | 2019-03-19 | 生益电子股份有限公司 | A kind of production method of impedance |
| CN111447732A (en) * | 2020-05-22 | 2020-07-24 | 浪潮电子信息产业股份有限公司 | Impedance matching method for PCB differential pair routing |
| WO2022003507A1 (en) * | 2020-07-01 | 2022-01-06 | International Business Machines Corporation | Periodic transmission line cable filtering |
-
2010
- 2010-04-20 CN CN2010201671960U patent/CN201657492U/en not_active Expired - Fee Related
Cited By (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104039076A (en) * | 2014-06-17 | 2014-09-10 | 浪潮(北京)电子信息产业有限公司 | Wire wrapping method and system for reducing difference circuit impedance mismatch degree |
| CN105338732A (en) * | 2015-12-09 | 2016-02-17 | 浪潮电子信息产业股份有限公司 | Wire winding method for improving high speed differential signals |
| CN106507583A (en) * | 2016-10-25 | 2017-03-15 | 郑州云海信息技术有限公司 | A kind of signal transmission line, method and system |
| CN108666722B (en) * | 2017-03-06 | 2021-05-04 | 安立股份有限公司 | High-frequency differential signal transmission line and signal transmission system |
| CN108666722A (en) * | 2017-03-06 | 2018-10-16 | 安立股份有限公司 | High frequency differentiating signal transmission line and signal transmission system |
| CN108055760A (en) * | 2017-12-29 | 2018-05-18 | 深圳市兴森快捷电路科技股份有限公司 | A kind of isometric compensating impedance matching process of differential pair |
| CN108055760B (en) * | 2017-12-29 | 2021-01-19 | 深圳市兴森快捷电路科技股份有限公司 | Differential pair equal-length compensation impedance matching method |
| CN109379832A (en) * | 2018-09-19 | 2019-02-22 | 中国电子科技集团公司第五十二研究所 | A kind of difference line compensation method improving differential signal anti-interference ability |
| CN109496065A (en) * | 2018-12-30 | 2019-03-19 | 生益电子股份有限公司 | A kind of production method of impedance |
| CN109496065B (en) * | 2018-12-30 | 2021-07-13 | 生益电子股份有限公司 | Impedance manufacturing method |
| CN111447732A (en) * | 2020-05-22 | 2020-07-24 | 浪潮电子信息产业股份有限公司 | Impedance matching method for PCB differential pair routing |
| WO2022003507A1 (en) * | 2020-07-01 | 2022-01-06 | International Business Machines Corporation | Periodic transmission line cable filtering |
| GB2613477A (en) * | 2020-07-01 | 2023-06-07 | Ibm | Periodic transmission line cable filtering |
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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 | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20101124 Termination date: 20160420 |