WO2023273245A1

WO2023273245A1 - Pcb wiring structure and pcb

Info

Publication number: WO2023273245A1
Application number: PCT/CN2021/141301
Authority: WO
Inventors: 蔡元元; 王志钢
Original assignee: 展讯通信（上海）有限公司
Priority date: 2021-06-28
Filing date: 2021-12-24
Publication date: 2023-01-05
Also published as: CN113473694A

Abstract

The present invention provides a PCB wiring structure and a PCB. The wiring structure comprises N straight line segments arranged in parallel and N-1 bent line segments used for connecting the N straight line segments in pairs, wherein N is an odd number, and N≥5; (N+1)/2 straight line segments which are sequentially connected from the starting straight line segment located at the edge of one side to the middle straight line segment located at the middlemost position and the bent line segments between said straight line segments have a first spiral winding structure which is wound from the outside to the inside, so that a transmitted signal have a first spiral direction; (N+1)/2 straight line segments which are sequentially connected from the middle straight line segment located at the middlemost position to the termination straight line segment located at the edge of the other side and the bent line segments between said straight line segments have a second spiral winding structure which is wound from the inside to the outside, so that the transmitted signal has a second spiral direction opposite to the first spiral direction. According to the present invention, the parasitic capacitance effect between adjacent signal lines can be reduced.

Description

The wiring structure of the PCB board and the PCB board

technical field

The invention relates to the technical field of printed circuit boards (PCBs), in particular to a wiring structure of a PCB board and the PCB board.

Background technique

At present, with the various functions of high-end mobile phones, the number of electronic components per unit area of printed circuit boards (Printed circuit board, referred to as PCB) is increasing. Especially in the 5G era, the size of the mobile phone is limited, but the requirements for high-speed signals are getting higher and higher. High-speed signals have requirements for the signal delay. The signal timing must be adjusted by controlling the length of the PCB wiring. The increase of parasitic effect between signal lines is also an aspect that must be considered for improvement.

For example, in the prior art, serpentine wiring can well solve the problem of line length adjustment in the case of limited wiring space, but the distance between adjacent signal lines is still relatively close, so the parasitic between these adjacent signal lines The capacitive effect will cause part of the energy of the input signal to jump directly between the two lines, which cannot achieve the desired effect of the design.

Contents of the invention

In order to solve the above problems, the present invention provides a wiring structure of a PCB board and the PCB board, which can reduce the effect of parasitic capacitance between adjacent signal lines.

On the one hand, the present invention provides a wiring structure of a PCB board, comprising:

N straight line segments arranged in parallel and N-1 bent line segments used to connect the N straight line segments two by two, N is an odd number, and N≥5, wherein,

The (N+1)/2 straight line segments connected sequentially from the initial straight line segment at one side edge to the middle straight line segment at the middlemost position and the bending line segments between them have a function from the outer layer to the inner layer The surrounding first helical winding structure makes the transmitted signal have a first helical direction;

The (N+1)/2 straight line segments connected sequentially from the center straight line segment at the middlemost position to the terminating straight line segment at the other side edge and the bending line segments between them have a function from the inner layer to the outer layer The surrounding second helical winding structure makes the transmitted signal have a second helical direction opposite to the first helical direction.

Optionally, if the first helical direction is a clockwise helical direction, the second helical direction is a counterclockwise helical direction;

If the first helical direction is a counterclockwise helical direction, the second helical direction is a clockwise helical direction.

Optionally, the bent line segment includes a straight line portion and folded line portions located on both sides of the straight line portion, the folded line portion is connected to an adjacent straight line segment, and the angle between the folded line portion and the straight line segment is 45 degrees or 135° degree, or the broken line part is arc-shaped, and the straight line part is perpendicular to the straight line segment.

Optionally, the N straight line segments are arranged at equal intervals.

Optionally, the distance between any two straight line segments is at least 3W, where W is the line width of the straight line segment.

Optionally, the wiring structure is used to transmit high-speed signals, and the high-speed signals include single-ended high-speed signals and differential high-speed signals.

In another aspect, the present invention provides a PCB board, which has the wiring structure of the above-mentioned PCB board.

The routing structure of the PCB board and the PCB board provided by the present invention can achieve the purpose of adjusting the length of the wire in the same routing space, thereby adjusting the timing of the transmission signal, and due to the change of the routing method, effectively reducing the adjacent The parasitic capacitance effect between the lines can well achieve the design purpose and improve the signal quality. The invention is especially suitable for high-density mobile phone PCB design, especially in the scene of 5G mobile phone platform for high-speed signal control timing, and can solve the problems of limited wiring space and high-speed signal quality improvement.

Description of drawings

FIG. 1 is a schematic diagram of a wiring structure according to an embodiment of the present invention;

FIG. 2 is a schematic diagram of a wiring structure according to an embodiment of the present invention;

FIG. 3 is a schematic diagram of a wiring structure according to an embodiment of the present invention;

FIG. 4 is a schematic diagram of a wiring structure according to an embodiment of the present invention.

detailed description

In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments It is only some embodiments of the present invention, but not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

It should be noted that the terms "first" and "second" in the description and claims of the present application and the above drawings are used to distinguish similar objects, but not necessarily used to describe a specific sequence or sequence. It should be understood that the data so used may be interchanged under appropriate circumstances for the embodiments of the application described herein. Furthermore, the terms "comprising" and "having", as well as any variations thereof, are intended to cover a non-exclusive inclusion, for example, a process, method, system, product or device comprising a sequence of steps or elements is not necessarily limited to the expressly listed instead, may include other steps or elements not explicitly listed or inherent to the process, method, product or apparatus.

In this application, the terms "upper", "lower", "left", "right", "front", "rear", "top", "bottom", "inner", "outer", "middle", The orientations or positional relationships indicated by "vertical", "horizontal", "horizontal", and "longitudinal" are based on the orientations or positional relationships shown in the drawings. These terms are mainly used to better describe the present application and its embodiments, and are not used to limit that the indicated devices, elements or components must have a specific orientation, or be constructed and operated in a specific orientation.

Moreover, some of the above terms may be used to indicate other meanings besides orientation or positional relationship, for example, the term "upper" may also be used to indicate a certain attachment relationship or connection relationship in some cases. Those skilled in the art can understand the specific meanings of these terms in this application according to specific situations.

Some embodiments of the present invention will be described in detail below in conjunction with the accompanying drawings. In the case of no conflict, the following embodiments and features in the embodiments can be combined with each other.

An embodiment of the present invention provides a routing structure of a PCB board. The routing structure includes: N straight line segments arranged in parallel and N-1 bent line segments for connecting the N straight line segments in pairs, N is an odd number, and N≥5, where,

Optionally, if the first helical direction is a clockwise helical direction, the second helical direction is a counterclockwise helical direction; if the first helical direction is a counterclockwise helical direction, then the second helical direction is a clockwise helical direction.

As an embodiment, the bent line segment connecting the straight line segment may include a straight line portion and a fold line portion located on both sides of the straight line portion, the fold line portion is connected to the adjacent straight line segment, and the angle between the fold line portion and the straight line segment is 45 degrees or 135 degrees , or the broken line part is arc-shaped, and the straight line part is perpendicular to the straight line segment.

In addition, in the embodiment of the present invention, the N straight line segments are arranged at equal intervals. The distance between any two straight line segments is at least 3W, where W is the line width of the straight line segment. 3W means: for a transmission line with a characteristic impedance of 50 ohms, the line spacing is three times the width of the signal line. Generally, the width of straight line segment and bent line segment is the same. Due to the spiral winding structure, the lengths of each straight line segment and each bent line segment are not equal.

In order to fully understand the embodiments of the present invention, some specific wiring structures are listed below.

Since when N=1, the routing is actually a straight line, and when N=3, the most basic serpentine routing can be used. Therefore, in the routing structure of the embodiment of the present invention, N is at least 5.

FIG. 1 shows the routing structure of the embodiment of the present invention corresponding to N=5. As shown in Figure 1, the routing structure includes 5 straight line segments in the vertical direction. The straight line segment is recorded as the center straight line segment, and the five straight line segments are labeled. The first straight line segment from the left is marked as 1, the second straight line segment from the right is marked as 2, the middle straight line segment is marked as 3, and the second from the left is the second The number of the first straight line segment is 4, and the first straight line segment from the right is numbered 5. The straight line segments labeled 1-3 and the bent line segments between them have a first spiral winding structure that wraps around from the outer layer to the inner layer, so that the transmitted signal has a clockwise spiral direction; the straight line segments marked 3-5 and The bent line segment therebetween has a second helical winding structure that is wound from the inner layer to the outer layer, so that the transmitted signal has a counterclockwise helical direction. Of course, the positions of the starting straight line segment and the ending straight line segment can be interchanged, and the direction of the transmission signal can also be changed. Finally, from the perspective of the signal transmission direction, the direction of the signal transmitted on the straight line segments on both sides of the edge is the same.

FIG. 2 shows the routing structure of the embodiment of the present invention corresponding to N=7. As shown in Figure 2, the wiring structure includes 7 straight line segments in the vertical direction. The straight line segment is recorded as the center straight line segment, and the 7 straight line segments are labeled. The first straight line segment from the left is marked as 1, the second straight line segment from the right is marked as 2, and the third straight line segment from the left is marked as 3, centered The number of the straight line segment is 4, the number of the third straight line segment from the right is 5, the number of the second straight line segment from the left is 6, and the number of the first straight line segment from the right is 7. The straight line segments labeled 1-4 and the bent line segments between them have a first spiral winding structure that wraps around from the outer layer to the inner layer, so that the transmitted signal has a clockwise spiral direction; the straight line segments marked 4-7 and The bent line segment therebetween has a second helical winding structure that is wound from the inner layer to the outer layer, so that the transmitted signal has a counterclockwise helical direction.

FIG. 3 shows the routing structure of the embodiment of the present invention corresponding to N=9. As shown in Figure 3, the wiring structure includes 9 straight line segments in the vertical direction. The straight line segment is recorded as the center straight line segment, and the 9 straight line segments are labeled, the first straight line segment from the left is marked as 1, the second straight line segment from the right is marked as 2, the third straight line segment from the left is marked as 3, and the right line segment is marked as 3. The label of the fourth straight line segment from the beginning is 4, the label of the middle straight line segment is 5, the label of the fourth straight line segment from the left is 6, the label of the third straight line segment from the right is 7, the label of the second straight line segment from the left is 8, The first line segment from the right is numbered 9. The straight line segments labeled 1-5 and the bent line segments between them have a first helical winding structure from the outer layer to the inner layer, so that the transmitted signal has a clockwise spiral direction; the straight line segments marked 5-9 and The bent line segment therebetween has a second helical winding structure that is wound from the inner layer to the outer layer, so that the transmitted signal has a counterclockwise helical direction.

FIG. 4 shows the routing structure of the embodiment of the present invention corresponding to N=11. As shown in Figure 4, the routing structure includes 11 straight line segments in the vertical direction. The straight line segment is recorded as the center straight line segment, and the 11 straight line segments are labeled, the first straight line segment from the left is marked as 1, the second straight line segment from the right is marked as 2, the third straight line segment from the left is marked as 3, and the right The fourth straight line segment from the left is marked 4, the fifth straight line segment from the left is marked 5, the middle straight line segment is marked 6, the fifth straight line segment from the right is marked 7, and the fourth straight line segment from the left is marked 8. The third straight line segment from the right is numbered 9, the second straight line segment from the left is numbered 10, and the first straight line segment from the right is numbered 11. The straight line segments labeled 1-6 and the bent line segments between them have a first spiral winding structure that wraps around from the outer layer to the inner layer, so that the transmitted signal has a clockwise spiral direction; the straight line segments marked 6-11 and The bent line segment therebetween has a second helical winding structure that is wound from the inner layer to the outer layer, so that the transmitted signal has a counterclockwise helical direction.

As can be seen from the above examples, the relationship between the label of the centered straight line segment and N is fixed, the value is (N+1)/2, the label of the starting straight line segment is 1, and the label of the ending straight line segment is N . Starting with the straight line segment on the left, the labeling rules for N straight line segments from 1 to N are: left 1 (label 1), right 2 (label 2), left 3 (label 3), right 4 (label 4), left 5 (label 5), ..., the middle line segment (label (N+1)/2), ..., right 5 (label N-4), left 4 (label N-3), right 3 (label N- 2), left 2 (label N-1), right 1 (label N).

In addition, the routing structure of the embodiment of the present invention is suitable for single-ended high-speed signals and differential high-speed signals. When transmitting single-ended high-speed signals, the signal line is a single line. Line. The above embodiments show the wiring structure when transmitting a single-ended high-speed signal, and the wiring structure for transmitting a differential high-speed signal can be obtained by analogy, and will not be further described.

The routing structure provided by the embodiment of the present invention is a spiral winding structure. Compared with the serpentine wire, the purpose of adjusting the length of the wire can be achieved in the same routing space, thereby adjusting the timing of the transmission signal, and because the routing The change of the line mode effectively reduces the parasitic capacitance effect between adjacent lines, which can well achieve the design purpose and improve the signal quality.

Finally, in order to verify the effect of the spiral routing, the applicant conducted a simulation comparison test. The simulation comparison test uses three kinds of routing patterns, namely, straight line, spiral and serpentine. The lengths of the three lines are the same, and the line spacing and occupied area of the spiral and serpentine are the same. The S parameters of the above three routings are extracted by SIWAVE, and the link construction simulation is carried out in the Designer supporting ANSYS. The simulation results show that, with the same trace length, the time delay of the serpentine trace is significantly faster than that of the straight trace due to electromagnetic coupling, and the helical trace is almost close to that of the straight trace due to the improvement and optimization of the coupling path. delay.

On the other hand, an embodiment of the present invention further provides a PCB board, which has the wiring structure of the PCB board in the above embodiment.

The above is only a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Anyone skilled in the art can easily think of changes or substitutions within the technical scope disclosed in the present invention. All should be covered within the protection scope of the present invention. Therefore, the protection scope of the present invention should be determined by the protection scope of the claims.

Claims

A kind of wiring structure of PCB board, it is characterized in that, described wiring structure comprises:

N straight line segments arranged in parallel and N-1 bent line segments used to connect the N straight line segments two by two, N is an odd number, and N≥5, wherein,

The (N+1)/2 straight line segments connected sequentially from the initial straight line segment at one side edge to the middle straight line segment at the middlemost position and the bending line segments between them have a function from the outer layer to the inner layer The surrounding first helical winding structure makes the transmitted signal have a first helical direction;

The (N+1)/2 straight line segments connected sequentially from the center straight line segment at the middlemost position to the terminating straight line segment at the other side edge and the bending line segments between them have a function from the inner layer to the outer layer The surrounding second helical winding structure makes the transmitted signal have a second helical direction opposite to the first helical direction.
The routing structure of the PCB board according to claim 1, wherein if the first helical direction is a clockwise helical direction, then the second helical direction is a counterclockwise helical direction;

If the first helical direction is a counterclockwise helical direction, the second helical direction is a clockwise helical direction.
The wiring structure of the PCB board according to claim 1, wherein the bent line segment includes a straight line portion and folded line portions located on both sides of the straight line portion, the folded line portion is connected to an adjacent straight line segment, and the bent line portion is connected to an adjacent straight line segment. The angle between the broken line and the straight line is 45 degrees or 135 degrees, or the broken line is arc-shaped, and the straight line is perpendicular to the straight line.
The routing structure of the PCB board according to claim 1, wherein the N straight line segments are arranged at equal intervals.
The wiring structure of the PCB board according to claim 4, wherein the distance between any two straight line segments is at least 3W, wherein W is the line width of the straight line segment.
The routing structure of the PCB board according to claim 1, wherein the routing structure is used to transmit high-speed signals, and the high-speed signals include single-ended high-speed signals and differential high-speed signals.
A PCB board, characterized in that the PCB board has the wiring structure of the PCB board according to any one of claims 1 to 6.