A signal wire winding structure that avoids the glass fiber effect

Abstract

This utility model relates to a signal cable winding structure that avoids the fiberglass effect. The cable routing includes straight segments and wavy segments. The wavy segments include straight portions and curved portions. The straight segments form a first angle with a first direction axis, and the straight portions of the wavy segments form a second angle with the first direction axis. The second angle is equal to the first angle plus 90°. Multiple curved portions on both sides of the wavy segments are aligned along the direction of the first direction axis. This utility model features a unique angle setting for the straight segments and straight portions of the wavy segments in high-speed signal cables. This allows the straight portions of the straight segments and wavy segments to avoid the fiberglass braiding direction, effectively reducing signal transmission delay caused by the fiberglass effect. The wavy segments can still extend along the original design direction, avoiding large-area intersections and overlaps between the cable routing and surrounding lines caused by overall rotation, improving the utilization rate of wiring space and increasing the utilization rate of the board material. For high-speed signals, the neat and smooth wiring shape can effectively improve signal quality.

Description

Technical Field

[0001] This utility model relates to the field of circuit design, specifically to a signal line winding structure that avoids the glass fiber effect. Background Technology

[0002] In the design and manufacturing of printed circuit boards (PCBs), the transmission performance of signal traces is closely related to the characteristics of the dielectric material. Conventional PCB dielectrics are made of fiberglass cloth and resin bonded together. Due to the significant difference in dielectric constants between fiberglass and resin, and the woven structure of the fiberglass cloth, voids inevitably appear within the weave, resulting in uneven dielectric distribution at different locations on the PCB. When differential pair traces are routed continuously horizontally or vertically, the fiberglass and resin combinations encountered by the two traces will vary depending on their location within the fiberglass weave, leading to differences in signal propagation speeds. This ultimately causes problems such as transmission delay, signal distortion, and degraded signal integrity—a phenomenon collectively known as the fiberglass effect.

[0003] Currently, the common method used in the industry to address the fiberglass effect is through photoplotting, rotating the traces by 5°-10° to avoid the fiberglass braiding direction and thus weaken the effect. If it's only a straight segment, the rotation only requires slight adjustments to the surrounding traces to make room for the rotated trace; the adjustment is relatively simple and has little impact on the overall wiring layout. However, for traces containing wavy segments, the situation is much more complex. Because wavy segments have curved sections and zigzag structures, after rotation, their curved shape will overlap with surrounding traces over a large area, creating numerous unusable blank areas on the circuit board and significantly wasting valuable wiring space.

[0004] The above problems are worth solving. Utility Model Content

[0005] To address the problems of traditional methods for dealing with the fiberglass effect, such as large-scale overlap and waste of layout space caused by the routing of wires with surrounding lines, this invention provides a signal line winding structure that avoids the fiberglass effect.

[0006] The technical solution of this utility model is as follows:

[0007] A signal line winding structure to avoid the glass fiber effect includes a straight line segment and a wavy line segment. The wavy line segment includes a straight portion and an arc portion. The straight line segment has a first angle with a first direction axis, and the straight portion of the wavy line segment has a second angle with the first direction axis. The second angle is equal to the first angle plus 90°. Multiple arc portions on both sides of the wavy line segment are aligned along the direction of the first direction axis.

[0008] As a preferred embodiment of this utility model, the first direction axis is a horizontal axis, the angle between the straight line segment and the horizontal axis is equal to the value of the first angle, and the sum of the angle between the straight part of the wavy line segment and the vertical axis and 90° is equal to the value of the second angle.

[0009] As a preferred embodiment of this utility model, the center distance between two adjacent arc portions on the same side of the wavy line segment is equal.

[0010] As a preferred embodiment of this utility model, the spacing between two adjacent straight sections of the wavy line segment is equal.

[0011] As a preferred embodiment of this utility model, the lengths of the straight sections of the wavy line segment are equal.

[0012] As a preferred embodiment of this utility model, the length of the straight sections at both ends of the wavy line segment is the first length, and the length of the remaining straight sections of the wavy line segment excluding the straight sections at both ends is the second length, and the first length is equal to half of the second length.

[0013] As a preferred embodiment of this utility model, the first included angle is equal to 10° or 15°.

[0014] As a preferred embodiment of this invention, the traces are two parallel differential traces.

[0015] The advantages of this utility model based on the above solution are as follows:

[0016] This invention features a unique angle setting for the straight sections of the straight and wavy segments in high-speed signal lines. Specifically, the straight section forms a specific first angle with the first direction axis, and the straight section of the wavy segment adds 90° to this to form a second angle. This ingenious angle setting allows both the straight sections and the straight sections of the wavy segment to avoid the fiberglass braiding direction, effectively reducing signal transmission delay and distortion caused by the fiberglass effect. Furthermore, during the design process of the winding structure, only the value of the first angle needs to be determined, and the second angle is automatically determined without additional adjustment, significantly improving design convenience.

[0017] Compared with the traditional method, this utility model only twists the straight part of the wave line segment at a specific angle, while the arc part is aligned and arranged along the first direction axis, so that the wave line segment can still extend along the original design direction. This avoids the large-area intersection and overlap of the traces with the surrounding lines caused by the overall rotation, significantly improving the utilization rate of PCB wiring space and increasing the utilization rate of the board material.

[0018] In addition, for high-speed signals, the neat and smooth wiring pattern of this invention can effectively improve signal quality. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the winding structure of this utility model;

[0020] Figure 2 This is a schematic diagram of the traces without rotation;

[0021] Figure 3 This is a schematic diagram of the wiring after rotation in the prior art.

[0022] In the diagram,

[0023] 1. Straight line segment; 2. Wavy line segment; 21. Straight line section; 22. Curved line section. Detailed Implementation

[0024] To better understand the purpose, technical solution, and technical effects of this utility model, the following description, in conjunction with the accompanying drawings and embodiments, will provide further explanation. It should be noted that similar reference numerals and letters in the following drawings indicate similar items; therefore, once an item is defined in one drawing, it does not need further definition and explanation in subsequent drawings. It is also stated that the embodiments described below are only for explaining this utility model and are not intended to limit it.

[0025] It should be noted that when a component is referred to as "fixed to" or "set on" another component, it can be directly on the other component or there may be an intermediate component. When a component is referred to as "connected to" another component, it can be directly connected to the other component or there may be an intermediate component.

[0026] The indicated orientation or positional relationship is based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship in which the product is usually placed when in use, or the orientation or positional relationship in which a person skilled in the art would normally understand it, or the orientation or positional relationship in which the product is usually placed when in use. It is only for the purpose of facilitating the description of this application and simplifying the description, and is not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application.

[0027] The terms “first” and “second” are used for descriptive purposes only and should not be construed as indicating or implying relative importance or specifying the number of technical features. “Multiple” and “several” mean two or more, unless otherwise explicitly specified.

[0028] like Figures 1 to 3As shown, a signal line winding structure to avoid the fiberglass effect is disclosed, comprising two parallel differential traces. Each differential trace includes a straight segment 1 and a wavy segment 2, with the wavy segment 2 comprising a straight portion 21 and an arc portion 22. The straight segment 1 forms a first angle α with the first direction axis (X-axis), and the straight portion 21 of the wavy segment 2 forms a second angle β with the first direction axis. The second angle is equal to the first angle plus 90°. By setting specific angular relationships between the straight segment 1, the straight portion 21 of the wavy segment 2, and the first direction axis, a unique winding shape is formed. This structural design is based on a certain skew direction of the fiberglass braiding, allowing each part of the trace to precisely avoid the fiberglass braiding direction and reduce the impact of the fiberglass effect.

[0029] By adopting the above technical solution, the specific angle between the straight portion 21 of the straight segment 1 and the first direction axis and the first direction axis ensures that the wiring always avoids the fiberglass braiding direction on the transmission path, effectively reducing signal transmission delay, distortion, and loss caused by the fiberglass effect and ensuring signal integrity. The arc portion 22 of the wavy segment 2 is aligned along the first direction axis, making the wiring structure more regular, optimizing the wiring space layout, and facilitating integration with other lines; at the same time, it reduces signal reflection and crosstalk caused by irregular wiring, further improving signal transmission quality.

[0030] In this embodiment, the first direction axis is a horizontal axis. The angle between the straight segment 1 and the horizontal axis is equal to the value of the first angle. The sum of the angle between the straight portion 21 of the wavy segment 2 and the vertical axis and the 90° angle is equal to the value of the second angle. Based on the conventional direction of fiberglass braiding, the horizontal axis is used as a reference to conform to the fiberglass braiding direction. This makes the angle settings of the straight segments 1 and wavy segment 2 more targeted, and the routing angles more accurately planned to avoid the main direction of fiberglass braiding, thereby enhancing the suppression effect on the fiberglass effect from the source. At the same time, the clear angle reference method allows designers to intuitively and accurately execute angle parameters when drawing wiring diagrams or manufacturing, reducing avoidance failures caused by angle deviations.

[0031] The center distance between two adjacent arc sections 22 on the same side of the wave segment 2 is equal. The shape of the wave segment 2 in this embodiment is more regular and presents a uniform distribution in the overall wiring layout. During signal transmission, the impedance change of the signal is more uniform, reducing signal reflection and loss caused by impedance changes and improving the stability of signal transmission.

[0032] The spacing between two adjacent straight sections 21 of the wavy line segment 2 is equal. The regular spacing of the straight sections 21 helps the wavy line segment 2 to better plan the circuit when routing on the PCB, improving routing efficiency and layout rationality; it also facilitates standardized processing during the manufacturing process, reducing production difficulty and cost, and improving product quality and reliability.

[0033] The wave segment 2 is composed of multiple alternating straight sections 21 and curved sections 22. The straight sections 21 at both ends (i.e., the straight sections 21 near the start and end of the wave segment 2) are shorter and have a first length. The remaining straight sections 21 in the middle of the wave segment 2 are longer and have a second length. The first length is exactly half of the second length. This structure allows the straight sections 1 on both sides to be connected at the middle position of the wave amplitude of the wave segment 2.

[0034] In one specific embodiment, if the first included angle is 10°, then the second included angle is 100°. In this case, the straight segment 1 is arranged at a 10° angle to the horizontal axis. This tilt angle allows the straight segment 1 to effectively avoid the transverse weaving direction of the fiberglass. The straight portion 21 of the wavy segment 2 is arranged at a 100° angle to the horizontal axis, that is, at a 10° angle to the vertical axis. This tilt angle allows the straight portion 21 of the wavy segment 2 to effectively avoid the vertical weaving direction of the fiberglass, ensuring the stability and integrity of signal transmission.

[0035] In one specific embodiment, if the first included angle is 15°, then the second included angle is 105°. In this case, the straight segment 1 is arranged at a 15° angle to the horizontal axis; the straight portion 21 of the wavy segment 2 is arranged at a 105° angle to the horizontal axis, that is, at a 15° angle to the vertical axis. The straight segments 1 and 21 of the wavy segment 2 effectively avoid common fiberglass weaving directions.

[0036] As can be seen, the winding structure of this utility model only requires determining the value of the first included angle during the design process, and the second included angle is naturally determined without any additional adjustment, which significantly improves the design convenience.

[0037] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0038] The above embodiments only illustrate several implementation methods of this utility model, and their descriptions are relatively specific and detailed, but they should not be construed as limiting the scope of the utility model patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this utility model, and these all fall within the protection scope of this utility model. Therefore, the protection scope of this utility model patent should be determined by the appended claims.

Claims

1. A signal line winding structure to avoid the glass fiber effect, wherein the trace includes straight segments and wavy segments, the wavy segments comprising straight portions and curved portions, characterized in that, The straight line segment has a first angle with the first direction axis, and the straight part of the wavy line segment has a second angle with the first direction axis, the second angle being equal to the first angle plus 90°; The multiple arc portions on both sides of the wavy line segment are aligned along the direction of the first direction axis.

2. The signal line winding structure for avoiding the glass fiber effect according to claim 1, characterized in that, The first direction axis is a horizontal axis, the angle between the straight line segment and the horizontal axis is equal to the value of the first angle, and the sum of the angle between the straight part of the wavy line segment and the vertical axis and 90° is equal to the value of the second angle.

3. The signal line winding structure for avoiding the glass fiber effect according to claim 1, characterized in that, The center-to-center distance between two adjacent arc segments on the same side of the wavy line segment is equal.

4. The signal line winding structure for avoiding the glass fiber effect according to claim 1, characterized in that, The spacing between two adjacent straight sections of the wavy line segment is equal.

5. The signal line winding structure for avoiding the glass fiber effect according to claim 1, characterized in that, The lengths of the straight sections of the wavy line segment are equal.

6. The signal line winding structure for avoiding the glass fiber effect according to claim 1, characterized in that, The length of the straight sections at both ends of the wavy line segment is the first length, and the length of the remaining straight sections of the wavy line segment excluding the straight sections at both ends is the second length. The first length is equal to half of the second length.

7. The signal line winding structure for avoiding the glass fiber effect according to claim 1, characterized in that, The first included angle is equal to 10° or 15°.

8. The signal line winding structure for avoiding the glass fiber effect according to claim 1, characterized in that, The traces are two parallel differential traces.

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