Differential signal line structure and circuit board

Abstract

The invention relates to a differential signal line structure and a circuit board, the differential signal line structure comprises a first wire and a second wire, the first wire comprises at least two first linear segments and at least one first winding segment, and one first winding segment is connected between two adjacent first linear segments; the first wire comprises at least two first straight line sections and at least one first wire winding section, the second wire comprises at least two second straight line sections and at least one second wire winding section, one second wire winding section is connected between every two adjacent second straight line sections, the protruding height of the wire winding section of the first wire is larger than that of the second wire winding section, and the total length of the first wire is the same as that of the second wire. The first wire winding sections and the second wire winding sections which are the same in number are correspondingly arranged in the first wire and the second wire respectively, propagation paths of electric signals on the first wire and the second wire are changed in the same way, time differences caused by wire winding on the first wire and the second wire can be offset mutually, the purpose of eliminating time delay is achieved, and the time delay rate is increased. And the reliability of the product can be improved.

Description

Technical Field

[0001] The present application relates to the technical field of differential signal lines, and in particular to a differential signal line structure and a circuit board. Background Art

[0002] With the rapid development of the communications industry, the rate of high-speed differential signals is getting higher and higher. In order to achieve higher rates, the four-level pulse amplitude modulation (4-Level Pulse Amplitude Modulation, PAM4) signal mode has emerged. Because differential signals refer to signals transmitted by two wires, what is transmitted is the level difference between the two signals, and PAM4 signal technology is a modulation technology that uses 4 different signal levels for signal transmission, which requires that the positive signal (P) and the negative signal (N) in the differential signal arrive at the receiving end at the same time.

[0003] In the related art, the short wires in the differential signal lines are wound longer, and the purpose of isochronous transmission is achieved by controlling the total length of the differential signal lines to be equal. However, the propagation paths of the differential signal lines after winding will be different, and even if the total length of the signal lines is the same, the purpose of isochronous transmission of electrical signals cannot be achieved. Summary of the invention

[0004] Based on this, it is necessary to provide a differential signal line structure and a circuit board. The first routing line and the second routing line in the differential signal line structure are wound at the same time, so that the time difference caused by the winding of the first routing line and the second routing line can offset each other, thereby realizing isochronous propagation of the differential signal.

[0005] The embodiment of the present application provides a differential signal line structure, including:

[0006] A first routing line includes at least two first straight line segments and at least one first winding line segment, wherein one first winding line segment is connected between two adjacent first straight line segments, and the first winding line segment is raised relative to the first straight line segment;

[0007] A second routing line includes at least two second straight line segments and at least one second winding line segment, wherein a second winding line segment is connected between two adjacent second straight line segments, and the second winding line segment is raised relative to the second straight line segment;

[0008] The number of the first winding segments is the same as that of the second winding segments, the protrusion height of the first winding segments is greater than that of the second winding segments, and the total length of the first routing is the same as that of the second routing.

[0009] In one embodiment, the ratio of the protrusion height of the first winding segment to the protrusion height of the second winding segment is in the range of 3-5.

[0010] In one embodiment, the protrusion height of the first winding segment is greater than or equal to 3 times the preset distance and less than or equal to 5 times the preset distance, and the protrusion height of the second winding segment is greater than or equal to the preset distance; wherein the preset distance is the shortest distance between the first straight line segment and the second straight line segment that are relatively set.

[0011] In one embodiment, the first routing includes a plurality of the first winding segments, and a distance between two adjacent first winding segments is greater than or equal to 10 times a preset distance; wherein the preset distance is the shortest distance between a first straight line segment and a second straight line segment that are relatively set.

[0012] In one embodiment, the first winding segment and the second winding segment respectively include a first sub-segment, a second sub-segment and a third sub-segment connected in sequence, wherein the second sub-segment is arranged in parallel with the straight line segment.

[0013] In one embodiment, the ratio of the line length of the second sub-segment of the first routing line to the line length of the second sub-segment of the second routing line is in a range of 1-3.

[0014] In one embodiment, a projection of the first winding segment toward the second routing line is located within the second winding segment.

[0015] In one embodiment, the protruding direction of the first winding segment is opposite to the protruding direction of the second winding segment; wherein the protruding direction of the first winding segment is from the second routing line to the first routing line, or from the first routing line to the second routing line.

[0016] In one embodiment, the line width of the first winding segment is the same as the line width of the second winding segment, the line width of the first straight line segment is the same as the line width of the second straight line segment, and the line width of the first winding segment is greater than the line width of the first straight line segment.

[0017] An embodiment of the present application further provides a circuit board, including a substrate, and a differential signal line structure as described above, arranged on the substrate.

[0018] The above-mentioned differential signal line structure and circuit board include a first routing line and a second routing line, wherein the first routing line includes at least two first straight line segments and at least one first winding line segment, one first winding line segment is connected between two adjacent first straight line segments, and the first winding line segment is raised relative to the first straight line segment; the second routing line includes at least two second straight line segments and at least one second winding line segment, one second winding line segment is connected between two adjacent second straight line segments, and the second winding line segment is raised relative to the second straight line segment, the straight line segment length of the first routing line is smaller than the straight line segment length of the second routing line, and the raised height of the winding line segment of the first routing line is larger than the raised height of the second routing segment, so that the winding length of the first routing line is larger than the winding length of the second routing line, so that the total length of the first routing line is the same as the total length of the second routing line. By respectively setting the same number of first winding segments and second winding segments in the first routing and the second routing, the propagation paths of the electrical signals on the first routing and the second routing undergo the same changes, and the time differences caused by the windings on the first routing and the second routing can be offset, thereby achieving the purpose of eliminating the delay. The design of the first routing and the second routing having the same total length and the isochronous propagation of the electrical signals on the first routing and the second routing can be achieved, thereby improving the transmission quality of the electrical signals and enhancing the reliability of the product. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the conventional technology, the drawings required for use in the embodiments or the conventional technology descriptions are briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0020] Figure 1 One of the structural schematic diagrams of the differential signal line structure provided in the embodiment of the present application;

[0021] Figure 2 The second structural diagram of the differential signal line structure provided in the embodiment of the present application;

[0022] Figure 3 The third structural diagram of the differential signal line structure provided in the embodiment of the present application;

[0023] Figure 4 A fourth structural diagram of a differential signal line structure provided in an embodiment of the present application;

[0024] Figure 5 A fifth structural diagram of a differential signal line structure provided in an embodiment of the present application;

[0025] Figure 6 The sixth structural diagram of the differential signal line structure provided in the embodiment of the present application;

[0026] Figure 7 The seventh structural diagram of the differential signal line structure provided in the embodiment of the present application;

[0027] Figure 8 It is a structural schematic diagram of a circuit board in the related art;

[0028] Fig. 9 For Figure 8 The simulation result diagram of the circuit board shown;

[0029] Fig.10 A schematic diagram of the structure of a circuit board provided in an embodiment of the present application;

[0030] Fig.11 For Fig.10 The simulation results of the circuit board shown in the figure.

[0031] Description of Figure Numbers:

[0032] 10-first routing; 110-first straight line segment; 120-first winding segment;

[0033] 20-second routing; 210-second straight line segment; 220-second winding segment;

[0034] A-first sub-paragraph; B-second sub-paragraph; C-third sub-paragraph;

[0035] 31 - first signal line; 32 - second signal line; 301 - convex hull of the first signal line. DETAILED DESCRIPTION

[0036] In order to make the above-mentioned purposes, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are described in detail below in conjunction with the accompanying drawings. In the following description, many specific details are set forth to facilitate a full understanding of the present application. However, the present application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without violating the connotation of the present application, so the present application is not limited by the specific embodiments disclosed below.

[0037] In the description of the present application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0038] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of this application, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0039] In this application, unless otherwise clearly specified and limited, the terms "installed", "connected", "electrically connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed electrical connection, a detachable electrical connection, or an integrated one; it can be a mechanical electrical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0040] In the present application, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being "above", "above" or "above" a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being "below", "below" or "below" a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0041] It should be noted that when an element is referred to as being "fixed to" or "disposed on" another element, it may be directly on the other element or there may be a central element. When an element is considered to be "electrically connected to" another element, it may be directly electrically connected to the other element or there may be a central element at the same time. The terms "vertical", "horizontal", "upper", "lower", "left", "right" and similar expressions used herein are for illustrative purposes only and do not represent the only implementation method.

[0042] like Figure 1 As shown, in an exemplary embodiment, the present application provides a differential signal line structure, which includes a first line 10 and a second line 20. Among them, one of the first line 10 and the second line 20 is a P signal line for transmitting a positive signal P in the differential signal line, and one of the first line 10 and the second line 20 is an N signal line for transmitting a negative signal N in the differential signal line.

[0043] The first routing line 10 includes at least two first straight line segments 110 and at least one first winding line segment 120, wherein a first winding line segment 120 is connected between two adjacent first straight line segments 110. The second routing line 20 includes at least two second straight line segments 210 and at least one second winding line segment 220, wherein a second winding line segment 220 is connected between two adjacent second straight line segments 210. The first winding line segment 120 is convex relative to the first straight line segment 110, and the second winding line segment 220 is convex relative to the second straight line segment 210. In the embodiment of the present application, the first winding line segment 120 and the second winding line segment 220 can be referred to as convex hulls. Exemplarily, the first winding line segment 120 and the second winding line segment 220 can respectively include a zigzag winding formed by a plurality of straight line segments, or can also be a winding composed of a straight line segment and a curved line segment. In the embodiment of the present application, the specific shapes of the first winding and the second winding are not limited.

[0044] In the embodiment of the present application, in the first routing 10, the sum of the lengths of the first straight line segments 110 is less than the sum of the lengths of the second straight line segments 210, which can be understood as the straight line length of the first routing 10 is less than the straight line length of the second routing 20. The winding height of any first winding in the first routing 10 is greater than the winding height of any second winding. Among them, the winding height can be understood as the convex height of the convex hull, the convex height H1 of the first winding segment 120, and the convex height H2 of the second winding segment 220. For ease of explanation, the convex height is taken as the shortest distance between the highest point segment and the corresponding straight line segment in each winding segment. For example, the convex height can be the shortest distance between the core of the highest point segment and the core of the corresponding straight line segment.

[0045] like Figure 2 and Figure 3 As shown, in an exemplary embodiment, if the first wiring 10 includes a plurality of first winding segments 120, and the second wiring 20 includes a plurality of second winding segments 220, the number of the first winding segments 120 and the number of the second winding segments 220 are the same. Optionally, the protrusion heights of the first winding segments 120 may be the same or different; the protrusion heights of the second winding segments 220 may be the same or different.

[0046] The differential line structure in this embodiment is provided with a first winding segment 120 in the first line 10 and a second winding segment 220 in the second line 20, and the protrusion height of the winding segment of the first line 10 is greater than the protrusion height of the segment of the second line 20, so that the winding length of the first line 10 is greater than the winding length of the second line 20, so that the total length of the first line 10 is the same as the total length of the second line 20. The total length includes the sum of the straight line length and the winding length. In addition, by respectively setting the same number of first winding segments 120 and second winding segments 220 in the first routing 10 and the second routing 20, the propagation paths of the electrical signals on the first routing 10 and the second routing 20 undergo the same changes, and the time differences caused by the windings on the first routing 10 and the second routing 20 can be offset from each other, thereby achieving the purpose of eliminating the delay, and further realizing the design of the total length of the first routing 10 and the second routing 20 being equal, as well as the isochronous propagation of the electrical signals on the first routing 10 and the second routing 20, thereby improving the transmission quality of the electrical signals and enhancing the reliability of the product.

[0047] In an exemplary embodiment, the convex height of the first winding segment 120 is greater than the convex height of the second winding segment 220. For example, the ratio of the convex height of the first winding segment 120 to the convex height of the second winding segment 220 is in the range of 3-5. It can be understood that the first winding segment 120 is a large convex hull, and the second winding segment 220 is a small convex hull. Due to the limited actual design space of the first routing 10 and the second routing 20, the convex height of the second winding segment 220 is 3-5 times the convex height of the first winding segment 120. The second winding segment 220 with a certain height can be designed within the limited design space, and the propagation path of the electrical signal on the first routing 10 and the second routing 20 can also be changed in the same manner.

[0048] In an exemplary embodiment, the protrusion height of the first winding segment 120 is greater than or equal to 3 times the preset distance and less than or equal to 5 times the preset distance; the protrusion height of the second winding segment 220 is as small as possible, and the protrusion height of the first winding segment 120 is greater than or equal to the preset distance. The preset distance D can be the shortest distance between the first straight line segment 110 and the second straight line segment 210 that are relatively arranged. In other words, the preset distance D can be understood as the spacing between the first routing line 10 and the second routing line 20. Exemplarily, the protrusion height H1 of the first winding segment 120 can be (3-5)*D, and the protrusion height H2 of the second winding segment 220 can be 1*D.

[0049] In this embodiment, the protrusion height of the first winding segment 120 and the protrusion height of the second winding segment 220 are both related to the spacing D, which can prevent the protrusion height of the first winding segment 120 from being too low and the protrusion height of the second winding segment 220 from being too high. While ensuring that the propagation paths on the first routing 10 and the second routing 20 undergo the same changes, the occupied area of ​​the first routing 10 and the second routing 20 can also be saved.

[0050] Please continue to refer to Figure 1 In an exemplary embodiment, the first winding segment 120 and the second winding segment 220 respectively include a first sub-segment A, a second sub-segment B, and a third sub-segment C that are connected in sequence.

[0051] Exemplarily, the first sub-segment A, the second sub-segment B and the third sub-segment C are respectively straight segments, and the second sub-segment B is arranged in parallel with the corresponding straight segment. If the first routing 10 includes multiple first winding segments 120, the line length L1 of the second sub-segment B in each first winding segment 120 may be the same or different. Correspondingly, in the second routing 20, the line length L2 of the second sub-segment B in each second winding segment 220 may be the same or different. The ratio of the line length L2 of the second sub-segment B of the first routing 10 to the line length L1 of the second sub-segment B of the second routing 20 is in the range of 1-3. It can be understood that the length L1 of the second sub-segment B of any first winding segment 120 in the first routing 10 is greater than or equal to the line length L2 of the second sub-segment B of any second winding segment 220 in the second routing 20. For example, the ratio of the line length L1 of the second sub-segment B of the first wiring 10 to the line length L2 of the second sub-segment B of the second wiring 20 may be 1, 1.5, 2, 2.5 or 3.

[0052] In an exemplary embodiment, the line length L1 of the second sub-segment B in each first winding is the same, the line length L2 of the second sub-segment B in each second winding segment 220 is the same, and the line length L1 of the second sub-segment B in the first winding is greater than the line length L2 of the second sub-segment B in the second winding.

[0053] Please continue to refer to Figure 1 In an exemplary embodiment, the line width w of each first straight line segment 110 in the first routing line 10 and each second straight line segment 210 in the second routing line 20 is the same. The line length L1 of the second sub-segment B in the first winding is the same as the line length L2 of the second sub-segment B of the second winding segment 220. For example, the line length L1 of the second sub-end B in the first winding segment 120 may be 4 times the line width w of the first straight line segment 110, that is, L1==L2=4*w.

[0054] Optionally, the first sub-segment A and the third sub-segment C are arc segments, and the second sub-segment B is a straight line segment, and is arranged in parallel with the corresponding straight line segment. For example, the first sub-segment A and the third sub-segment C in the first winding can be smoothly connected to the first straight line segment 110 and the second sub-segment B in the first winding, respectively. The first sub-segment A and the third sub-segment C in the second winding segment 220 can be smoothly connected to the second straight line segment 210 and the second sub-segment B in the second winding segment 220, respectively.

[0055] In this embodiment, when the winding heights of the first winding segment 120 and the second winding segment 220 are constant, the lengths of the second sub-segments B in the first winding segment 120 and the second winding segment 220 can be flexibly set, so that the total length of the first routing 10 and the total length of the second routing 20 can be quickly and efficiently made the same, so as to achieve equal length design of the first routing 10 and the second routing 20. In addition, by adjusting the lengths of the second sub-segments B of the first winding segment 120 and the second winding segment 220, the propagation paths of the electrical signals on the first routing 10 and the second routing 20 can be changed in the same manner, so as to achieve equal length of the transmission paths of the electrical signals and isochronous propagation of the electrical signals.

[0056] Please continue to refer to Figure 1 In an exemplary embodiment, the protruding direction of the first winding segment 120 is opposite to the protruding direction of the second winding segment 220. The protruding direction of the first winding segment 120 is the direction from the second routing 20 to the first routing 10, and the protruding direction of the second winding segment 220 is the direction from the first routing 10 to the second routing 20. In this way, the protruding heights of the first winding segment 120 and the second winding segment 220 are opposite, so that the first routing 10 and the second routing 20 can be as close as possible while meeting the communication requirements. In addition, the protruding directions of the first winding and the second winding are both in the direction away from the straight line segment, which can reduce the occupied area of ​​the differential routing.

[0057] like Figure 4 As shown, optionally, the protruding direction of the first winding segment 120 is from the first wiring 10 to the second wiring 20 , and the protruding direction of the second winding segment 220 is from the second wiring 20 to the first wiring 10 .

[0058] like Figure 5 and Figure 6 As shown, in an exemplary embodiment, the protruding direction of the first winding segment 120 is the same as the protruding direction of the second winding segment 220. Exemplarily, the protruding direction of the first winding segment 120 and the protruding direction of the second winding segment 220 can both be the direction from the first wiring 10 to the second wiring 20, such as Figure 5 Optionally, the protruding direction of the first winding segment 120 and the protruding direction of the second winding segment 220 may both be the direction in which the second wiring 20 points to the first wiring 10, as shown in FIG. Figure 6 shown.

[0059] It should be noted that in the embodiment of the present application, the protruding direction of each first winding segment 120 and the protruding direction of each second winding segment 220 are not limited.

[0060] Please continue to refer to Figure 2 and Figure 3 In an exemplary embodiment, the first routing line 10 includes a plurality of first winding segments 120, and the second routing line 20 includes a plurality of second winding segments 220. A corresponding straight line segment is connected between two adjacent winding segments. The distance between two adjacent first winding segments 120 is greater than or equal to 10 times the preset distance D. Correspondingly, the distance between two adjacent second winding segments 220 is greater than or equal to 10 times the preset distance D.

[0061] Exemplarily, the distance between two adjacent first winding segments 120 is greater than or equal to the convex hull width of the first winding segment 120. The convex hull width can be understood as the distance between the first connection point and the second connection point, the first connection point being the connection point between the first sub-segment A and the first straight line segment 110, and the second connection point being the connection point between the third sub-segment C and the first straight line segment 110. Correspondingly, the distance between two adjacent second winding segments 220 is greater than or equal to the convex hull width of the second winding segment 220. The convex hull width of the second winding segment 220 can refer to the convex hull width of the first winding segment 120, which will not be described in detail here.

[0062] In this embodiment, if the first routing 10 includes multiple first winding segments 120, and the second routing 20 includes multiple second winding segments 220, by setting the spacing between two adjacent first winding segments 120, and the spacing between two adjacent second winding segments 220, it is possible to avoid the spacing between the two winding segments being too close, thereby avoiding the situation where the impedance discontinuity points are too close, thereby improving the transmission quality of the electrical signal and enhancing the reliability of the product.

[0063] Please continue to refer to Figure 2 In an exemplary embodiment, in the first routing line 10 and the second routing line 20, each first winding segment 120 is arranged opposite to a corresponding second winding segment 220. The relative arrangement can be understood as that the projection of the second winding segment 220 toward the first routing line 10 is located within the first winding segment 120.

[0064] In this embodiment, the first winding segment 120 in the first routing 10 and the second winding segment 220 in the second routing 20 are arranged relative to each other. For example, the projection of the second winding segment 220 toward the first routing 10 is located within the first winding segment 120. In this way, the problem of impedance mutation caused by the winding method of the first routing 10 and the second routing 20 can be avoided, and the reflection of high-speed signals can be effectively reduced to improve the signal quality.

[0065] like Figure 7 As shown, in an exemplary embodiment, the line width w1 of the first straight line segment 110 is the same as the line width w1 of the second straight line segment 210, the line width w2 of the first winding segment 120 is the same as the line width w2 of the second winding segment 220, and the line width w2 of the first winding segment 120 is greater than the line width w1 of the first straight line segment 110. It can be understood that the line width w2 of each first winding segment 120 in the first routing 10 is greater than the line width w1 of the first straight line segment 110, and the line width w2 of each second winding segment 220 in the second routing 20 is greater than the line width w1 of the second straight line segment 210. By adjusting the line width w2 of the first winding segment 120 and the line width w2 of the second winding segment 220, the impedance of the corresponding routing can be adjusted so that the impedance corresponding to the first routing 10 is equal to half of the target impedance of the differential line, and the impedance corresponding to the second routing 20 is equal to half of the target impedance of the differential line. Exemplarily, the target impedance of the differential line is 100Ω, and the corresponding impedance of the first routing line 10 and the second routing line 20 is 50Ω.

[0066] In an exemplary embodiment, the ratio of the line width w2 of the first winding segment 120 to the line width w1 of the first straight segment 110 is in the range of 1.05-1.2. For example, the ratio of the line width w2 of the first winding segment 120 to the line width w1 of the first straight segment 110 can be 1.05, 1.1, 1.15 or 1.2.

[0067] In this embodiment, by widening the routing of each winding segment in the first routing 10 and the second routing 20, the influence of the increase in the spacing between the first winding segment 120 and the second winding segment 220 on the differential impedance of the first routing 10 and the second routing 20 can be eliminated, thereby ensuring the consistency of the differential impedance of the first routing 10 and the second routing 20, thereby improving the transmission quality of the electrical signal and enhancing the reliability of the product.

[0068] In an exemplary embodiment, Fig.10 As shown, the present application also provides a circuit board, which includes a substrate 100 and a differential signal line structure arranged on the substrate 100.

[0069] For example, the substrate 100 may include a printed circuit board (PCB), and the printed circuit board may be a single-layer PCB or a multi-layer PCB. The differential line structure in any of the above embodiments may be located at any layer of the PCB.

[0070] The circuit board in the embodiment of the present application includes a substrate 100 and a differential signal line structure arranged on the substrate 100. By setting a first winding segment 120 in the first routing 10 and a second winding segment 220 in the second routing 20, and the protrusion height of the winding segment of the first routing 10 is greater than the protrusion height of the segment of the second routing 20, the winding length of the first routing 10 is greater than the winding length of the second routing 20, so that the total length of the first routing 10 is the same as the total length of the second routing 20. In addition, by respectively setting the same number of first winding segments 120 and second winding segments 220 in the first routing 10 and the second routing 20, the propagation paths of the electrical signals on the first routing 10 and the second routing 20 undergo the same changes, and the time differences caused by the windings on the first routing 10 and the second routing 20 can be offset from each other, thereby achieving the purpose of eliminating the delay, and further realizing the design of the total length of the first routing 10 and the second routing 20 being equal, as well as the isochronous propagation of the electrical signals on the first routing 10 and the second routing 20, thereby improving the transmission quality of the electrical signals and enhancing the reliability of the product.

[0071] In related technologies, such as Figure 8 As shown, the circuit board structure includes a first signal line 31 and a second signal line 32, wherein the first signal line 31 includes a plurality of convex hulls 301 arranged at intervals, the second signal line 32 is not provided with convex hulls, and the total lengths of the first signal line 31 and the second signal line 32 are the same. Figure 8 The differential line structure shown in the figure is used to extract the S parameter model through source simulation and read the Inter-pairSkew index of the differential signal. The result is as follows Fig. 9 shown. Fig.10 The circuit board structure provided in the embodiment of the present application includes a first wiring 10 and a second wiring 20, wherein the first wiring 10 includes a first winding segment 120, and the second wiring 20 includes a second winding segment 220. Fig.10 The circuit board shown in the figure extracts the S parameter model through source simulation and reads the Inter-pairSkew index of the differential signal delay. The result is as follows Fig.11 As shown. Based on Fig. 9 and Fig.11 From the simulation results, it can be seen that the Inter-pairSkew index of the circuit board circuit structure provided in the embodiment of the present application is improved by 1.6ps compared with the circuit board circuit structure in the related technology, and the Inter-pairSkew index of the circuit board circuit structure provided in the embodiment of the present application is 0.2ps, which is close to 0, and its Inter-pairSkew is significantly improved.

[0072] The technical features of the above embodiments may be combined arbitrarily. To make the description concise, 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.

[0073] The above embodiments only express several implementation methods of the present application, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the patent application. It should be pointed out that, for a person of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the present application, and these all belong to the protection scope of the present application. Therefore, the protection scope of the patent application shall be subject to the attached claims.

Claims

1. A differential signal line structure, characterized in that: include: A first routing line includes at least two first straight line segments and at least one first winding line segment, wherein one first winding line segment is connected between two adjacent first straight line segments, and the first winding line segment is raised relative to the first straight line segment; A second routing line includes at least two second straight line segments and at least one second winding line segment, wherein a second winding line segment is connected between two adjacent second straight line segments, and the second winding line segment is raised relative to the second straight line segment; The number of the first winding segments is the same as that of the second winding segments, the protrusion height of the first winding segments is greater than that of the second winding segments, and the total length of the first routing is the same as that of the second routing.

2. The differential signal line structure according to claim 1, characterized in that: The ratio of the protrusion height of the first winding segment to the protrusion height of the second winding segment is in the range of 3-5.

3. The differential signal line structure according to claim 2, characterized in that: The protruding height of the first winding segment is greater than or equal to 3 times the preset distance and less than or equal to 5 times the preset distance, and the protruding height of the second winding segment is greater than or equal to the preset distance; wherein the preset distance is the shortest distance between the first straight line segment and the second straight line segment that are relatively set.

4. The differential signal line structure according to claim 1, characterized in that: The first routing line includes a plurality of the first winding segments, and a distance between two adjacent first winding segments is greater than or equal to 10 times a preset distance; wherein the preset distance is the shortest distance between a first straight line segment and a second straight line segment that are relatively arranged.

5. The differential signal line structure according to claim 1, characterized in that: The first winding segment and the second winding segment respectively include a first sub-segment, a second sub-segment and a third sub-segment which are connected in sequence, wherein the second sub-segment is arranged in parallel with the straight line segment.

6. The differential signal line structure according to claim 5, characterized in that: The ratio of the line length of the second sub-segment of the first routing line to the line length of the second sub-segment of the second routing line is in a range of 1-3.

7. The differential signal line structure according to claim 1, characterized in that: A projection of the first winding segment toward the second routing line is located within the second winding segment.

8. The differential signal line structure according to claim 1, characterized in that: The protruding direction of the first winding segment is opposite to the protruding direction of the second winding segment; wherein the protruding direction of the first winding segment is from the second routing line to the first routing line, or from the first routing line to the second routing line.

9. The differential signal line structure according to claim 1, characterized in that: The line width of the first winding segment is the same as the line width of the second winding segment, the line width of the first straight line segment is the same as the line width of the second straight line segment, and the line width of the first winding segment is greater than the line width of the first straight line segment.

10. A circuit board, characterized in that: It comprises a substrate, and a differential signal line structure as claimed in any one of claims 1 to 9 arranged on the substrate.

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