CN109379832A - A kind of difference line compensation method improving differential signal anti-interference ability - Google Patents
A kind of difference line compensation method improving differential signal anti-interference ability Download PDFInfo
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- CN109379832A CN109379832A CN201811091590.8A CN201811091590A CN109379832A CN 109379832 A CN109379832 A CN 109379832A CN 201811091590 A CN201811091590 A CN 201811091590A CN 109379832 A CN109379832 A CN 109379832A
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- Prior art keywords
- line
- differential
- length
- protrusion
- point
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Classifications
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
- H05K1/00—Printed circuits
- H05K1/02—Details
- H05K1/0213—Electrical arrangements not otherwise provided for
- H05K1/0216—Reduction of cross-talk, noise or electromagnetic interference
- H05K1/0228—Compensation of cross-talk by a mutually correlated lay-out of printed circuit traces, e.g. for compensation of cross-talk in mounted connectors
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
- H05K1/00—Printed circuits
- H05K1/02—Details
- H05K1/0213—Electrical arrangements not otherwise provided for
- H05K1/0237—High frequency adaptations
- H05K1/0245—Lay-out of balanced signal pairs, e.g. differential lines or twisted lines
Abstract
The invention discloses a kind of difference line compensation methods for improving differential signal anti-interference ability, it include: the length for measuring and needing to compensate in differential pair, the shape and size of the corresponding single protrusion of the Design of length compensated as needed, occurring to carry out isometric compensation using the single protrusion in point 600mil apart from Length discrepancy, protrusion includes the top line section parallel with differential lines, and top line section both ends pass through two side lines being arranged symmetrically and are connected in the differential lines for needing to lengthen.By using compensation method of the invention, it can be avoided and not be difficult to the problems such as compensating nearby because not coupling when position is more, Length discrepancy is excessive caused by using multiple 2S/3W to compensate, improve the anti-interference ability of differential signal.
Description
Technical field
The present invention relates to the Signal Integrity Design technical fields of high-speed link, and in particular to a kind of raising differential signal is anti-
The difference line compensation method of interference performance.
Background technique
In high-speed link, since especially frequency domain breaks through 1GHz, with the rising of speed, problems of Signal Integrity becomes
More and more prominent, the transmission that differential signal is carried out using differential lines is to solve the problems, such as this effective means.
Differential signal is two equivalences for driving end to send, the signal of reverse phase, and receiving terminal is by comparing the two voltages
It is 0 or 1 that difference, which carrys out decision logic state, and carries this and be just referred to as differential lines to the route of differential signal.Differential lines include
Two are parallel to each other and wide cabling, and extraneous common-mode noise is cancelled out each other because being coupled on two cablings simultaneously.
When propagating in a pair of tightly coupled differential pair due to differential signal, the mutation tool in crosstalk and return path is coped with
There is preferable robustness, differential lines are more extensive as the transport vehicle application of high speed signal.But in practical applications, two
It is likely to occur that length is unequal between the differential lines being parallel to each other, causes the time delay between differential pair inconsistent.
If the signal on two transmission lines occurs prolonging difference or dislocation, it can all make differential signal to the identical common mode letter of phase
Number conversion.Biggish differential mode turns common mode, may make to be output on external difference line and leads to the problem of EMI；If common mode signal voltage
It is excessively high, the input amplifier of differential receiver will be made to be saturated, be allowed to accurately read in differential signal；In addition, will also generate
A series of problems, such as anti-interference ability is deteriorated, and eye figure is deteriorated.These can all impact signal quality.For this reason, it may be necessary to difference
Separated time carries out isometric compensation, to improve signal quality.
For traditional 2S/3W compensation way, if there is very big Length discrepancy, then can be compensated with multiple 2S/3W.
This can produce multiple not coupling positions, and not coupling for difference is more, and anti-interference ability is poorer.In addition, when point occurs for Length discrepancy
Between spacing when being more than 600mil, using 2S/3W compensation way, it is difficult to be compensated in time to phase difference, anti-interference ability
It is insufficient.
In view of the foregoing, it is necessary to which a kind of compensation method that can be improved differential lines anti-interference ability is provided.
Summary of the invention
The present invention provides a kind of difference line compensation methods for improving differential signal anti-interference ability, only with a protrusion
Point is occurred to big Length discrepancy and carries out isometric compensation, is avoided more, anti-dry because not coupling position caused by using multiple 2S/3W to compensate
Disturb the problems such as ability is poorer；Meanwhile reduction coiling is individually projected through, point can be occurred to Length discrepancy in time and compensated, made
Insertion Loss variation is gentle, and resonance point is reduced, and the Insertion Loss of high frequency treatment reduces.
To achieve the above object, the invention adopts the following technical scheme:
A kind of difference line compensation method improving differential signal anti-interference ability, comprising:
The length for needing to compensate in measurement differential pair, the shape of the corresponding single protrusion of the Design of length compensated as needed
And size, occur to carry out isometric compensation using the protrusion in setting range near point in Length discrepancy；
The protrusion occurs to be less than 600mil at a distance from point with Length discrepancy；
The protrusion includes the top line section parallel with differential lines, and top line section both ends pass through two side lines being arranged symmetrically and are connected to
In the differential lines for needing to lengthen；The side line includes the interlude vertical with differential lines, one end of interlude by top line with
The other end of the top line section connection, the interlude is connect by bottom line with the differential lines lengthened are needed；Among described two
The spacing of section is greater than or equal to 5 times of differential lines line width.
Preferably, the top line is parallel to each other with the bottom line in side line described in same.
Preferably, in the protrusion, the top line section, top line, interlude, bottom line and the difference for needing to lengthen
Separated time, the angle between two line segments being directly connected to each other are greater than or equal to 135 degree.
Preferably, the top line, interlude and bottom line, length is all larger than or the differential lines line width equal to 1.5 times.
Preferably, when the spacing that point occurs for adjacent two Length discrepancy is greater than 600mil, in each adjacent institute
Two Length discrepancies are stated to occur that a protrusion is arranged at point；When the spacing that point occurs for adjacent two Length discrepancy is less than 600mil
When, the center between two Length discrepancies generation point is arranged in the protrusion.
The difference line compensation method provided by the invention for improving differential signal anti-interference ability is passed using single protrusion substitution
Multiple 2S/3W of system carry out isometric compensation, have the advantage that
It is compensated in time at Length discrepancy using coiling as few as possible, Insertion Loss variation is gentle, effectively reduces resonance point, and high
Insertion Loss at frequency reduces；
The differential mode that differential signal can be reduced turns common mode, and reduction, which is output on external difference line, generates electromagnetic interference, eye figure
Effect is good；
The phase of differential signal can be compensated in time, improve the anti-interference ability of differential signal.
Detailed description of the invention
Fig. 1 is the structural schematic diagram of differential lines in the first embodiment；
Fig. 2 is the structural schematic diagram of differential lines in second of embodiment；
Fig. 3 is using traditional 2S/3W compensation method to the compensated structural schematic diagram of Fig. 1；
Fig. 4 is using single protrusion to the compensated structural schematic diagram of Fig. 1；
Fig. 5 is the structural schematic diagram of protrusion；
Fig. 6 is the eye figure emulated to Fig. 3；
Fig. 7 is the eye figure emulated to Fig. 4.
The reference numerals are as follows in figure: 1, the first Length discrepancy point；2, the second Length discrepancy point；3, third Length discrepancy point；4,
4th Length discrepancy point；5, signal via transmitting terminal；6, differential lines；7,2S/3W protrusion；8, raised；81, top line section；82, intermediate
Section；83, line is pushed up；84, bottom line.
Specific embodiment
Following will be combined with the drawings in the embodiments of the present invention, and technical solution in the embodiment of the present invention carries out clear, complete
Site preparation description, it is clear that described embodiments are only a part of the embodiments of the present invention, instead of all the embodiments.It is based on
Embodiment in the present invention, it is obtained by those of ordinary skill in the art without making creative efforts every other
Embodiment shall fall within the protection scope of the present invention.
A kind of difference line compensation method of raising differential signal anti-interference ability of technical solution of the present invention, comprising:
The length for needing to compensate in measurement differential pair, the shape of the corresponding single protrusion of the Design of length compensated as needed
And size, occur to carry out isometric compensation using the protrusion in setting range near point in Length discrepancy；
Wherein: protrusion occurs to be less than 600mil at a distance from point with Length discrepancy；Protrusion includes the top line section parallel with differential lines,
Top line section both ends pass through two side lines being arranged symmetrically and are connected in the differential lines for needing to lengthen；The side line includes hanging down with differential lines
Straight interlude, one end of interlude are connect by pushing up line with the top line section, and the other end of the interlude is connected the bottom of by
Line is connect with the differential lines lengthened are needed；The spacing of two interlude is greater than or equal to 5 times of differential lines line width.
Preferably, the top line is parallel to each other with the bottom line in side line described in same.
Preferably, in the protrusion, the top line section, top line, interlude, bottom line and the difference for needing to lengthen
Separated time, the angle between two line segments being directly connected to each other are greater than or equal to 135 degree.
Preferably, the top line, interlude and bottom line, length is all larger than or the differential lines line width equal to 1.5 times.
Preferably, when the spacing that point occurs for adjacent two Length discrepancy is greater than 600mil, in each adjacent institute
Two Length discrepancies are stated to occur that a protrusion is arranged at point；When the spacing that point occurs for adjacent two Length discrepancy is less than 600mil
When, the center between two Length discrepancies generation point is arranged in the protrusion.
Embodiment 1, the differential lines for needing to carry out isometric compensation are as shown in Figure 1.There are two differ differential lines 6 in figure altogether
Long that point, respectively the first Length discrepancy point 1 and the second Length discrepancy point 2 occurs, the spacing that two Length discrepancies occur between point is greater than
600mil。
First Length discrepancy point 1 is less than 600mil at a distance from signal via transmitting terminal 5, and the P line on the inside of differential lines is along the path ε
Cabling, track lengths 59.86mil, the N line on the outside of differential lines is along the path χ cabling, track lengths 78.71mil, two paths
Between track lengths differ 18.85mil, the length for needing to compensate is larger.
Second Length discrepancy point 2 is far from signal sending end, since, there are two turnings, turning degree is respectively α and β at this,
P line length on the inside of differential lines is 93.10mil, and the N line length on the outside of differential lines is 103.03mil, and the length for needing to compensate is
9.93mil。
Isometric compensation, compensated differential lines are carried out to the P line on the inside of differential lines in Fig. 1 using traditional 2S/3W method
As shown in Figure 3.
It is 18.85mil, using traditional 2S/3W method since the length for needing to compensate at the first Length discrepancy point 1 is larger
The end to end formation compensation long-chain of 8 2S/3W protrusions 7 is needed when compensating close to the first Length discrepancy point 1, due to the compensation
Long-chain is longer, and the first Length discrepancy of distance point 1 farther out, is not inconsistent long chain end with nearest compensation principle.In addition, the compensation long-chain
The not coupling length also resulted between P line and N line increases, and declines the anti-interference ability of differential signal.
The length for needing to compensate at second Length discrepancy point 2 is 9.93mil, using traditional 2S/3W method close to second
The two sides of Length discrepancy point 2 use the short chain comprising two 2S/3W protrusions 7 to compensate respectively, and short chain is spaced apart from each other, and occur multiple
Position is not coupled, the interference free performance of differential signal is unfavorable for.
Using line width 6.4mil, the micro-strip line model of line spacing 5.6mil, dielectric thickness 5mil, to Fig. 3 in SI9000
In differential lines carry out analog simulation, obtain eye figure as shown in FIG. 6.In Fig. 6, abscissa represents the time, and unit is picosecond
(ps)；Ordinate represents current potential, and unit is volt (V).From fig. 6 it can be seen that the signal wire of partial status group is offset up,
Trace is set to thicken, the signal wire of partial status group is formed about apparent convex line everywhere in 40ps and 130ps, has more than and makes an uproar
The risk of acoustic capacitance limit.It can be concluded that, using traditional 2S/3W compensation method, which resists from the above eye Diagram Analysis
Interference performance is poor.
Isometric compensation is carried out to the differential lines in Fig. 1 using the single protrusion methods of the application, compensated differential lines are such as
Shown in Fig. 4.With the first Length discrepancy point 1 in 600mil, using one biggish raised 8 pairs this at compensated nearby,
With the second Length discrepancy point 2 in 600mil, using one lesser raised 8 pairs this at compensated nearby.Due to each
Length discrepancy o'clock is compensated only with a protrusion, is reduced not coupling length and is not coupled bits number.
As a preferred embodiment, the shape of single protrusion is as shown in Figure 5.Protrusion 8 includes parallel with differential lines 6
Top line section 81,81 both ends of top line section pass through two side lines that are arranged symmetrically and are connected in the differential lines 6 for needing to lengthen.Side line includes
The interlude 82 vertical with differential lines 6, one end of interlude 82 are connect by pushing up line 83 with top line section 81, interlude 82 it is another
One end is connect by bottom line 84 with the differential lines 6 lengthened are needed.The spacing of two interludes 82 is greater than or equal to 5 times of differential lines
Line width.In same side line, top line 83 is parallel to each other with the bottom line 84.Angle between two line segments being directly connected to each other
More than or equal to 135 degree.Top line, interlude and bottom line length be all larger than or equal to 1.5 times of differential lines 6 line width.
Using line width 6.4mil, the micro-strip line model of line spacing 5.6mil, dielectric thickness 5mil, to Fig. 4 in SI9000
In differential lines carry out analog simulation, obtain eye figure as shown in Figure 7.Comparison diagram 6 and Fig. 7, it can be deduced that, using the application's
Single protrusion occurs point to each Length discrepancy and carries out simple and quick compensation, can compensate phase difference in time, improve differential signal
Anti-interference ability.
In embodiment 1, since the spacing that point occurs for two adjacent Length discrepancies is greater than 600mil, each Length discrepancy is used
Occur the nearest compensation method of the protrusion within the corresponding 600mil of point, but be not limited in can be to neither for method of the invention
Isometric differential lines of the spacing greater than 600mil that point occurs compensate, and are less than in the spacing that point occurs to adjacent two Length discrepancy
When the differential lines of 600mil compensate, as long as the midpoint that point occurs for two Length discrepancy of distance is arranged in protrusion of the invention
In the range of 10mil, can equally it achieve the effect that as shown in Figure 7.
Embodiment 2, the differential lines for needing to carry out isometric compensation are as shown in Figure 2.There are two differ differential lines 6 in figure altogether
It is long that point, respectively third Length discrepancy point 3 and the 4th Length discrepancy point 4 occurs, since P line ratio N line has more at third Length discrepancy point 3
Length, be exactly equal to the length of the P line ratio N line reduction at the 4th Length discrepancy point 4, the two is cancelled out each other, and P line and N line etc. are made
It is long, therefore protrusion need not be set and carry out isometric compensation.
The above embodiments are merely illustrative of the technical solutions of the present invention rather than is limited, without departing substantially from essence of the invention
In the case where mind and its essence, related technical personnel make various changes and modifications the present invention and should belong to appended by the present invention
Scope of protection of the claims.
Claims (5)
1. a kind of difference line compensation method for improving differential signal anti-interference ability, which is characterized in that the raising differential signal
The difference line compensation method of anti-interference ability, comprising:
The length for needing to compensate in measurement differential pair, the shape and ruler of the corresponding single protrusion of the Design of length compensated as needed
It is very little, occur to carry out isometric compensation using the protrusion in setting range near point in Length discrepancy；
The protrusion occurs to be less than 600mil at a distance from point with Length discrepancy；
The protrusion includes the top line section parallel with differential lines, and top line section both ends pass through two side lines being arranged symmetrically and are connected to needs
In the differential lines of lengthening；
The side line includes the interlude vertical with differential lines, and one end of interlude is connect by pushing up line with the top line section,
The other end of the interlude is connect by bottom line with the differential lines lengthened are needed；The spacing of two interlude is greater than or waits
In 5 times of differential lines line width.
2. improving the difference line compensation method of differential signal anti-interference ability as described in claim 1, which is characterized in that same
In side line described in item, the top line is parallel to each other with the bottom line.
3. improving the difference line compensation method of differential signal anti-interference ability as described in claim 1, which is characterized in that described
In protrusion, the top line section, top line, interlude, bottom line and the differential lines for needing to lengthen, two be directly connected to each other
Angle between line segment is greater than or equal to 135 degree.
4. improving the difference line compensation method of differential signal anti-interference ability as described in claim 1, which is characterized in that described
Line, interlude and bottom line are pushed up, length is all larger than or the differential lines line width equal to 1.5 times.
5. improving the difference line compensation method of differential signal anti-interference ability as described in claim 1, which is characterized in that work as phase
When the spacing that point occurs for adjacent two Length discrepancy is greater than 600mil, occur to be arranged at point in each adjacent two Length discrepancy
One protrusion；When the spacing that point occurs for adjacent two Length discrepancy is less than 600mil, the protrusion is arranged neither
The isometric center occurred between point.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811091590.8A CN109379832A (en) | 2018-09-19 | 2018-09-19 | A kind of difference line compensation method improving differential signal anti-interference ability |
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| CN201811091590.8A CN109379832A (en) | 2018-09-19 | 2018-09-19 | A kind of difference line compensation method improving differential signal anti-interference ability |
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Cited By (7)
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| CN111046626A (en) * | 2019-12-12 | 2020-04-21 | 北京远度互联科技有限公司 | Method and device for equal length compensation of differential signal lines and server |
| CN112399701A (en) * | 2020-09-27 | 2021-02-23 | 苏州浪潮智能科技有限公司 | Signal wire for improving return loss characteristic caused by equal length of differential wire signal |
| CN113420527A (en) * | 2021-08-25 | 2021-09-21 | 苏州浪潮智能科技有限公司 | Method, device and system for calculating winding difference line length and storage medium |
| CN114126236A (en) * | 2022-01-26 | 2022-03-01 | 苏州浪潮智能科技有限公司 | Routing design method of differential transmission line and circuit board |
| CN114238199A (en) * | 2021-12-10 | 2022-03-25 | 瓴盛科技有限公司 | Signal compensation method and device for self-adaptive differential line |
| CN114297979A (en) * | 2021-12-23 | 2022-04-08 | 苏州浪潮智能科技有限公司 | Method, device and equipment for bump compensation under high-frequency signal and readable medium |
| WO2024045803A1 (en) * | 2022-08-30 | 2024-03-07 | 中兴通讯股份有限公司 | Printed circuit board, electronic device, and method for controlling propagation delay skew of differential pair |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN111046626A (en) * | 2019-12-12 | 2020-04-21 | 北京远度互联科技有限公司 | Method and device for equal length compensation of differential signal lines and server |
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| CN114238199A (en) * | 2021-12-10 | 2022-03-25 | 瓴盛科技有限公司 | Signal compensation method and device for self-adaptive differential line |
| CN114297979A (en) * | 2021-12-23 | 2022-04-08 | 苏州浪潮智能科技有限公司 | Method, device and equipment for bump compensation under high-frequency signal and readable medium |
| CN114297979B (en) * | 2021-12-23 | 2024-01-16 | 苏州浪潮智能科技有限公司 | Method, device, equipment and readable medium for bulge compensation under high-frequency signal |
| CN114126236A (en) * | 2022-01-26 | 2022-03-01 | 苏州浪潮智能科技有限公司 | Routing design method of differential transmission line and circuit board |
| WO2024045803A1 (en) * | 2022-08-30 | 2024-03-07 | 中兴通讯股份有限公司 | Printed circuit board, electronic device, and method for controlling propagation delay skew of differential pair |
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Application publication date: 20190222 |