Printed circuit board and signal transmission system

Abstract

The present embodiment relates to the technical field of signal transmission, in particular to a printed circuit board and a signal transmission system, in which a first signal line (140) extends from one first differential signal hole pair (121) of a first row structural unit (120) to a side of a second row structural unit (130) away from the first row structural unit through a gap between a second hole segment (135) and a fourth hole segment (137), or a first signal line (340) extends from one first differential signal hole pair (321) of a first row structural unit (320) to a side of a second row structural unit (330) away from the first row structural unit (320) through a gap between two adjacent second ground holes (332).

Description

[Technical Field]

[0001] [CROSS-REFERENCE TO RELATED APPLICATIONS] This application is based on and claims priority to Chinese Patent Application No. 202111110049.9, filed with the State Intellectual Property Administration of China on September 23, 2021, the entire contents of which are incorporated herein by reference.

[0002] [Technical field] TECHNICAL FIELD Embodiments of the present application relate to the technical field of signal transmission, and in particular to printed circuit boards and signal transmission systems. [Background technology]

[0003] With the development of science and technology, ultra-high-speed, large-capacity transmission systems are rapidly developing. High-speed connectors, as one of the most important signal transmission devices in ultra-high-speed, large-capacity transmission systems, are widely used in electronic devices and play an important role in connecting electronic devices.

[0004] Typically, high-speed connectors are connected to a printed circuit board package structure by a fisheye structure at the pin ends. Referring to FIG. 1, the printed circuit board package structure includes a plurality of row structure units arranged on a printed circuit board body, each row structure unit including a plurality of via holes arranged in a first direction, each of which includes a plurality of differential signal hole pairs and a plurality of ground holes. The row structure units are arranged in a second direction, the first direction intersecting with the second direction. The wiring method of the printed circuit board package structure is such that a signal line arranged on a wiring lead-out layer is connected to a differential signal hole pair in a row structure unit and then led out through a gap between the row structure unit and the connected row structure unit. This results in a single wiring method. Therefore, each row structure unit can only have one signal line routed on the same wiring lead-out layer. Furthermore, the number of wiring lead-out layers must be increased to connect the signal lines to the multiple differential signal hole pairs in the row structure units. Increasing the number of wiring lead-out layers increases the number of layers in the printed circuit board body, which increases the manufacturing cost of the printed circuit board.

[0005] Therefore, it is necessary to provide a printed circuit board and a signal transmission system that can reduce the number of layers of the printed circuit board body and reduce the manufacturing cost of the printed circuit board, while ensuring that signal lines are connected to multiple differential signal hole pairs in the row structure unit. Summary of the Invention

[0006] An embodiment of the present application includes a substrate body, a first row structural unit, a second row structural unit, and a first signal line, the substrate body having a first substrate block and a second substrate block arranged in order along a thickness direction thereof, the second substrate block having a first wiring lead-out layer, the first row structural unit including a plurality of first differential signal hole pairs and a plurality of first ground holes, the plurality of first differential signal hole pairs arranged in order along a first direction, at least one first ground hole being arranged between two adjacent first differential signal hole pairs, each of the first differential signal hole pairs and each of the first ground holes penetrating the first substrate block and the second substrate block, the first row structural unit and the second row structural unit arranged in order along a second direction, the first direction intersecting the second direction, the second row structural unit including a plurality of via holes arranged in order along the first direction, the plurality of via holes including a first via hole and a second via hole adjacent to the first via hole. the first via hole and the second via hole both penetrate the first substrate block and the second substrate block; the first via hole includes a first hole segment and a second hole segment; the second via hole includes a third hole segment and a fourth hole segment; the first hole segment and the third hole segment are located in the first substrate block, and a distance between the first hole segment and the third hole segment is a first distance; the second hole segment and the fourth hole segment are located in the second substrate block, and a distance between the second hole segment and the fourth hole segment is a second distance, the first distance being smaller than the second distance; the first signal line is located in the first wiring lead-out layer; and the first signal line extends from the first differential signal hole pair of one of the first row structural units to a side of the second row structural unit away from the first row structural unit, passing between the second hole segment and the fourth hole segment.

[0007] An embodiment of the present application provides a substrate including a substrate body, a first row structural unit, a second row structural unit, and a first signal line, the substrate body having a first substrate block and a second substrate block arranged in order along a thickness direction thereof, the second substrate block having a first wiring lead-out layer, the first row structural unit including a plurality of first differential signal hole pairs and a plurality of first ground holes, the plurality of first differential signal hole pairs arranged in order along a first direction, at least one first ground hole being provided between two adjacent first differential signal hole pairs, each of the first differential signal hole pairs and each of the first ground holes penetrating the first substrate block and the second substrate block, the first row structural unit and the second row structural unit arranged in order along a second direction, the first direction intersects with the second direction, the second row structural unit includes a plurality of second differential signal hole pairs and a plurality of second ground holes, the plurality of second differential signal hole pairs are arranged in order along the first direction, two adjacent second ground holes are arranged between two adjacent second differential signal hole pairs, each of the second differential signal hole pairs and each of the second ground holes both penetrates the first substrate block and the second substrate block, the first signal line is located in the first wiring lead-out layer, and the first signal line extends from one of the first differential signal hole pairs of the first row structural unit to a side of the second row structural unit away from the first row structural unit, passing between the two adjacent second ground holes.

[0008] An embodiment of the present application further provides a signal transmission system including the above printed circuit board. In order to more clearly describe the technical means in the embodiments of the present application, the following will briefly describe the drawings that need to be used in the description of the embodiments. It is obvious that the drawings in the following description are only some embodiments of the present application, and those skilled in the art can obtain other drawings based on these drawings without any creative work. [Brief explanation of the drawings]

[0009] [Figure 1] 1 is a schematic diagram showing a structure in which a package structure of a printed circuit board is located on a wiring lead layer. [Figure 2] 1 is a schematic diagram illustrating a structure in which a package structure of a printed circuit board according to some embodiments of the present application is located on a first wiring lead layer. [Figure 3] 1 is a partial cross-sectional view of a body of a printed circuit board according to some embodiments of the present application. [Figure 4] 1 is a partial cross-sectional view of a body of a printed circuit board according to some embodiments of the present application. [Figure 5] 1 is a partial cross-sectional view of a body of a printed circuit board according to some embodiments of the present application. [Figure 6] 1 is a schematic diagram illustrating a structure in which a package structure of a printed circuit board according to some embodiments of the present application is located on a first wiring lead layer. [Figure 7] 1 is a partial cross-sectional view of a body of a printed circuit board according to some embodiments of the present application. [Figure 8] 1 is a schematic diagram illustrating a structure in which a package structure of a printed circuit board according to some embodiments of the present application is located on a first wiring lead layer. [Figure 9] 10 is a schematic diagram illustrating another printed circuit board package structure according to some embodiments of the present application, the package structure being located on a first wiring lead layer. FIG. [Figure 10] FIG. 10 is a partial cross-sectional view of another printed circuit board body according to some embodiments of the present application. DETAILED DESCRIPTION OF THE INVENTION

[0010] The main objective of the embodiments of the present application is to provide a printed circuit board and a signal transmission system that can reduce the number of layers of the printed circuit board body and reduce the manufacturing cost of the printed circuit board, on the premise that signal lines are ensured to be connected to multiple differential signal hole pairs in the row structure unit.

[0011] As will be understood by those skilled in the art, many technical details are provided in each embodiment of the present application to help readers better understand the present application. However, the technical means claimed in the present application can be realized without these technical details and various changes and modifications based on the following embodiments. The division of the following embodiments is for ease of explanation and does not impose any limitations on the specific implementation manner of the present application. Each embodiment can be incorporated into each other as long as there is no contradiction.

[0012] Some embodiments of the present application provide a printed circuit board, in which a first substrate block and a second substrate block are sequentially arranged in a thickness direction of the substrate body, the second substrate block has a first wiring lead-out layer, the first row structural unit includes a plurality of first differential signal hole pairs and a plurality of first ground holes, the plurality of first differential signal hole pairs are sequentially arranged along a first direction, and at least one first ground hole is arranged between two adjacent first differential signal hole pairs, each of the first differential signal hole pairs and each of the first ground holes both penetrates the first substrate block and the second substrate block, the first row structural unit and the second row structural unit are sequentially arranged along a second direction, the first direction intersects with the second direction, the second row structural unit includes a plurality of via holes, the plurality of via holes are sequentially arranged along the first direction, the plurality of via holes includes a first via hole and a second via hole immediately adjacent to the first via hole, and both the first via hole and the second via hole penetrate the first substrate block and the second substrate block. the first via hole includes a first hole segment and a second hole segment, the second via hole includes a third hole segment and a fourth hole segment, the first hole segment and the third hole segment are located in the first substrate block, a distance between the first hole segment and the third hole segment is a first distance, the second hole segment and the fourth hole segment are located in the second substrate block, a distance between the second hole segment and the fourth hole segment is a second distance, the first distance is smaller than the second distance, the first signal line is located in the first wiring lead-out layer, the first signal line extends from the first differential signal hole pair of one of the first row structural units to a side of the second row structural unit away from the first row structural unit through between the second hole segment and the fourth hole segment, thereby providing more signal line wiring methods and increasing the number of signal lines that can be wired on each wiring lead-out layer, without needing to increase the number of signal lines by increasing the number of layers of the printed circuit board body;On the premise that the signal lines are connected to the multiple differential signal hole pairs in the first row structural unit, the number of layers of the printed circuit board body can be reduced, and the manufacturing cost of the printed circuit board can be reduced.

[0013] In order to make the objectives, technical means and advantages of some embodiments of the present application clearer, printed circuit boards according to some embodiments of the present application will be described in detail below with reference to the drawings.

[0014] 2 and 3, a PCB (Printed Circuit Board) according to some embodiments of the present application includes a substrate body 110, a first row structural unit 120, a second row structural unit 130, and a first signal line 140. The substrate body 110 is provided with a first substrate block 111 and a second substrate block 112 arranged in this order along its thickness direction (the X direction shown in FIG. 3). The second substrate block 112 has a first wiring lead-out layer 113. The first row structural unit 120 includes a plurality of first differential signal hole pairs 121 and a plurality of first ground holes 122. The plurality of first differential signal hole pairs 121 are arranged in a first direction (the X direction shown in FIG. 2). 2 ) and the first differential signal hole pairs 121 are sequentially arranged along a second direction (the Z direction shown in FIG. 2 ), and at least one first ground hole 122 is provided between two adjacent first differential signal hole pairs 121, and each of the first differential signal hole pairs 121 and each of the first ground holes 122 penetrates the first substrate block 111 and the second substrate block 112. The first row structural unit 120 and the second row structural unit 130 are sequentially arranged along a second direction (the Z direction shown in FIG. 2 ), and the first direction intersects with the second direction. The second row structural unit 130 includes a plurality of via holes 131, and the plurality of A number of via holes 131 are arranged in order along a first direction, and the plurality of via holes 131 include a first via hole 132 and a second via hole 133 immediately adjacent to the first via hole 132, and the first via hole 132 and the second via hole 133 both penetrate the first substrate block 111 and the second substrate block 112, and the first via hole 132 includes a first hole segment 134 and a second hole segment 135, and the second via hole 133 includes a third hole segment 136 and a fourth hole segment 137, and the first hole segment The first hole segment 134 and the third hole segment 136 are located in the first substrate block 111, and the spacing between the first hole segment 134 and the third hole segment 136 is a first spacing W1; the second hole segment 135 and the fourth hole segment 137 are located in the second substrate block 112, and the spacing between the second hole segment 135 and the fourth hole segment 137 is a second spacing W2, and the first spacing W1 is smaller than the second spacing W2; the first signal line 140 is located in the first wiring lead-out layer 113, and the first signal line 140 is located in the second wiring lead-out layer 114;The first differential signal hole pair 121 of the first row structural unit 120 extends to the side of the second row structural unit 130 away from the first row structural unit 120, passing between the second hole segment 135 and the fourth hole segment 137.

[0015] In some embodiments, there are two first ground holes 122 between two adjacent first differential signal hole pairs 121, thus increasing the spacing between the two adjacent first differential signal hole pairs 121 and reducing signal crosstalk between the two adjacent first differential signal hole pairs 121. In addition, the PCB according to this embodiment may further include a third row structural unit, a fourth row structural unit, etc. (not shown), and the second row structural unit 130 and the third row structural unit may be arranged in sequence along the second direction or may be arranged in sequence along a third direction (not shown), where the third direction intersects with the second direction and also intersects with the first direction.

[0016] In some embodiments, the axis of the first hole segment 134 does not overlap with the axis of the second hole segment 135 and / or the diameter of the first hole segment 134 is larger than the diameter of the second hole segment 135.

[0017] 4, in some embodiments, the diameter of the first hole segment 134 is the same as the diameter of the second hole segment 135, and the axis of the first hole segment 134 does not overlap with the axis of the second hole segment 135, thereby making the first spacing W1 smaller than the second spacing W2. In one embodiment, the axis of the first hole segment 134 does not overlap with the axis of the second hole segment 135, and the axis of the second hole segment 135 is located on the side of the axis of the first hole segment 134 away from the axis of the fourth hole segment 137, thereby making the first spacing W1 smaller than the second spacing W2.

[0018] 5, in another embodiment, the axis of first hole segment 134 overlaps the axis of second hole segment 135, and the diameter of first hole segment 134 is larger than the diameter of second hole segment 135. In this manner, the spacing between the sidewall of first hole segment 134 and the sidewall of third hole segment 136 can be larger than the spacing between the sidewall of second hole segment 135 and the sidewall of fourth hole segment 137, and first spacing W1 can be smaller than second spacing W2.

[0019] 3, in some embodiments, the axis of the first hole segment 134 does not overlap with the axis of the second hole segment 135, and the diameter of the first hole segment 134 is larger than the diameter of the second hole segment 135. In this manner, the second spacing W2 can be further increased.

[0020] In some embodiments, the axis of the third hole segment 136 does not overlap with the axis of the fourth hole segment 137 and / or the diameter of the third hole segment 136 is larger than the diameter of the fourth hole segment 137.

[0021] 4, in some embodiments, the diameter of third hole segment 136 is the same as the diameter of fourth hole segment 137, and the axis of third hole segment 136 does not overlap with the axis of fourth hole segment 137, thereby making first spacing W1 smaller than second spacing W2. In one embodiment, the axis of third hole segment 136 does not overlap with the axis of fourth hole segment 137, and the axis of fourth hole segment 137 is located on the side of the axis of third hole segment 136 away from the axis of first hole segment 134, thus making first spacing W1 smaller than second spacing W2.

[0022] 5, in another embodiment, the axis of third hole segment 136 overlaps the axis of fourth hole segment 137, and the diameter of third hole segment 136 is greater than the diameter of fourth hole segment 137. In this manner, the spacing between the sidewall of third hole segment 136 and the sidewall of first hole segment 134 can be smaller than the spacing between the sidewall of fourth hole segment 137 and the sidewall of second hole segment 135, and first spacing W1 can be smaller than second spacing W2.

[0023] 3, in some embodiments, the axis of third hole segment 136 does not overlap with the axis of fourth hole segment 137, and the diameter of third hole segment 136 is larger than the diameter of fourth hole segment 137. Thus, in this embodiment, because the axis of first hole segment 134 does not overlap with the axis of second hole segment 135, and the diameter of first hole segment 134 is larger than the diameter of second hole segment 135, the second spacing W2 can be maximized.

[0024] In one embodiment, since the axis of the first hole segment 134 of the PCB does not overlap with the axis of the second hole segment 135, and the axis of the third hole segment 136 does not overlap with the axis of the fourth hole segment 137, when manufacturing the first via hole 132 and the second via hole 133 of the PCB, holes can be first drilled on the side of the first substrate block 111 away from the second substrate block 112 to form the first hole segment 134 and the third hole segment 136, and then holes can be drilled on the side of the second substrate block 112 away from the first substrate block 111 to form the second hole segment 135 and the fourth hole segment 137.

[0025] In one embodiment, because the diameter of the first hole segment 134 of the PCB is larger than the diameter of the second hole segment 135 and the diameter of the third hole segment 136 is larger than the diameter of the fourth hole segment 137, a large diameter drill bit can be used to drill holes in the first substrate block 111 to form the first hole segment 134 and the third hole segment 136, and a small diameter drill bit can be used to drill holes in the second substrate block 112 to form the second hole segment 135 and the fourth hole segment 137. The large diameter drill bit and the small diameter drill bit are relative terms, i.e., the large diameter drill bit has a larger diameter than the small diameter drill bit.

[0026] Continuing to refer to FIG. 2, in some embodiments, the multiple via holes 131 of the second row structural unit 130 are multiple differential signal holes 101 and multiple second ground holes 138, the multiple differential signal holes 101 are arranged sequentially along the first direction, two immediately adjacent differential signal holes 101 form a second differential signal hole pair 139, and at least one second ground hole 138 is arranged between two adjacent second differential signal hole pairs 139.

[0027] In some embodiments, two immediately adjacent second ground holes 138 are provided between two adjacent second differential signal hole pairs 139. In this way, the distance between two adjacent second differential signal hole pairs 139 in the second row structural unit 130 can be increased, and signal crosstalk between the two adjacent second differential signal hole pairs 139 can be reduced. Similar to the two "second ground holes 138" provided between the two adjacent second differential signal hole pairs 139, the first via hole 132 and the second via hole 133 are also "two ground holes" provided between the two adjacent second differential signal hole pairs 139.

[0028] 6, in yet another embodiment, the first via hole 132 and the second via hole 133 are two differential signal holes in one second differential signal hole pair 139. Furthermore, also referring to FIG. 7, in one embodiment, the PCB further includes a second signal line 150, the substrate body 110 further includes a second wiring lead-out layer 114 located in the second substrate block 112, the second signal line 150 is located in the second wiring lead-out layer 114, and the second signal line 150 includes a first connection line 151 and a second connection line 152, and the first connection line 151 and the second connection line 152 are connected to the first via hole 132 and the second via hole 133, respectively. The first signal line 140 is located on the first wiring lead-out layer 113, and passes between the first via hole 132 and the second via hole 133. Therefore, the second signal line 150 connected to the first via hole 132 and the second via hole 133 is located on the second wiring lead-out layer 114. In other words, the wiring lead-out layer on which the second signal line 150 is located is different from the wiring lead-out layer on which the first signal line 140 is located. This makes it possible to avoid interference between the second signal line 150 connected to the first via hole 132 and the second via hole 133 and the first signal line 140. In this embodiment, the second wiring lead-out layer may be located on the first substrate block.

[0029] Referring to FIG. 8, in another embodiment, the first via hole 132 is adjacent to the second via hole 133, and the first via hole 132 and the second via hole 133 are one differential signal hole 101 and one second ground hole 138, respectively.

[0030] 2 and 3, in some embodiments, the PCB further includes a third signal line 160, which is located in the first wiring lead-out layer 113 and between the first row structural unit 120 and the second row structural unit 130. The third signal line 160 includes a bent portion 161 and an extending portion 162. The bent portion 161 extends from one of the first differential signal hole pairs 121 of the first row structural unit 120 in a direction away from the first row structural unit 120 and close to the extending portion 162. The extending portion 162 is located on a side of the bent portion 161 away from the first signal line 140 and extends along the first direction, thereby avoiding interference between the extending portion 162 and the first signal line 140. Furthermore, the first differential signal hole pair 121 connected to the bent portion 161 is different from the first differential signal hole pair 121 connected to the first signal line 140 .

[0031] In addition, in some embodiments, the first direction intersects with but is not perpendicular to the second direction, so that the first differential signal hole pair 121 in the first row structural unit 120 and the second differential signal hole pair 139 in the second row structural unit 130 are misaligned, which can further reduce signal crosstalk between the first differential signal hole pair 121 in the first row structural unit 120 and the second differential signal hole pair 139 in the second row structural unit 130.

[0032] In addition, in some embodiments, the first differential signal hole pair 121 and the second differential signal hole pair 139 are through holes, and when manufacturing the PCB of this embodiment, the first differential signal hole pair 121 and the second differential signal hole pair 139 are drilled in the second substrate block 112 to remove the stubs of the first differential signal hole pair 121 and the second differential signal hole pair 139, thereby reducing the influence of the stubs of the first differential signal hole pair 121 and the second differential signal hole pair 139 and further improving the signal transmission performance of the first differential signal hole pair 121 and the second differential signal hole pair 139.

[0033] In some embodiments, the first differential signal hole pair 121 and the second differential signal hole pair 139 are blind vias. As such, there is no need to drill holes for the first differential signal hole pair 121 and the second differential signal hole pair 139 in the second substrate block 112. In yet another embodiment, the first differential signal hole pair 121 and the second differential signal hole pair 139 are buried vias that include areas that contact the fisheye structure of the high-speed connector.

[0034] 3 , in some embodiments, the substrate body 110 further includes a plurality of dielectric layers 115, a plurality of conductive plane layers 116, and a plurality of third wiring lead-out layers 117, where the conductive plane layer 116, the first wiring lead-out layer 113, and the plurality of third wiring lead-out layers 117 are all conductive layers, and the dielectric layer 115 serves to bond and insulate two adjacent conductive layers. In this embodiment, the numbers of the dielectric layers 115, the conductive plane layers 116, and the third wiring lead-out layers 117 of the substrate body are not particularly limited, and the numbers of the dielectric layers 115, the conductive plane layers 116, and the third wiring lead-out layers 117 can be changed according to the actual application needs of the PCB.

[0035] Some embodiments of the present application provide a signal transmission system including a PCB. The PCB according to some embodiments of the present application is the same as the PCB according to some embodiments described above, so the PCB included in the signal transmission system according to some embodiments of the present application also has the same technical effects as the PCB according to some embodiments described above, and details will not be described here.

[0036] In some embodiments, the signal transmission system further includes a connector, the connector including a main body and a plurality of terminals all fixed to the main body, and portions of the plurality of first differential signal hole pairs, the plurality of first ground holes and the plurality of via holes located within the first substrate block are each inserted into one of the plurality of terminals.

[0037] Some embodiments of the present application provide another printed circuit board, the board body having a first substrate block and a second substrate block arranged in order along a thickness direction thereof, the second substrate block having a first wiring lead-out layer, the first row structural unit including a plurality of first differential signal hole pairs and a plurality of first ground holes, the plurality of first differential signal hole pairs arranged in order along a first direction, at least one first ground hole being provided between two adjacent first differential signal hole pairs, each of the first differential signal hole pairs and each of the first ground holes passing through the first substrate block and the second substrate block, the first row structural unit and the second row structural unit arranged in order along a second direction, the first direction intersects with the second direction, the second row structural unit includes a plurality of second differential signal hole pairs and a plurality of second ground holes, the plurality of second differential signal hole pairs are arranged in order along the first direction, two adjacent second ground holes are arranged between two adjacent second differential signal hole pairs, each of the second differential signal hole pairs and each of the second ground holes penetrates the first substrate block and the second substrate block, the first signal line is located in the first wiring lead-out layer, and the first signal line extends from one of the first differential signal hole pairs of the first row structural unit to a side of the second row structural unit away from the first row structural unit, passing between the two immediately adjacent second ground holes.

[0038] To make the objectives, technical means and advantages of some embodiments of the present application clearer, other printed circuit boards according to some embodiments of the present application will be described in detail below with reference to the drawings.

[0039] 9 and 10 , a PCB according to some embodiments of the present application includes a substrate body 310, a first row structural unit 320, a second row structural unit 330, and a first signal line 340. The substrate body 310 has a first substrate block 311 and a second substrate block 312 arranged in this order along its thickness direction (the X direction shown in FIG. 10 ). The second substrate block 312 has a first wiring lead-out layer 313. The first row structural unit 320 includes a plurality of first differential signal hole pairs 321 and a plurality of first ground holes 322. The plurality of first differential signal hole pairs 321 are arranged in this order along a first direction (the Y direction shown in FIG. 9 ). At least one first ground hole 322 is provided between two adjacent first differential signal hole pairs 321. Each of the first differential signal hole pairs 321 and each of the first ground holes 322 penetrates the first substrate block 311 and the second substrate block 312. 320 and the second row structural unit 330 are sequentially arranged along a second direction (Z direction shown in FIG. 9 ), and the first direction intersects with the second direction. The second row structural unit 330 includes a plurality of second differential signal hole pairs 331 and a plurality of second ground holes 332. The plurality of second differential signal hole pairs 331 are sequentially arranged along the first direction, and two adjacent second ground holes 332 are provided between two adjacent second differential signal hole pairs 331. The second differential signal hole pair 331 and each second ground hole 332 both penetrate the first substrate block 311 and the second substrate block 312, and the first signal line 340 is located in the first wiring lead-out layer 313. The first signal line 340 extends from one first differential signal hole pair 321 of the first row structural unit 320, through between two immediately adjacent second ground holes 332, to the side of the second row structural unit 330 away from the first row structural unit 320.

[0040] In some embodiments, there are two first ground holes 322 between two adjacent first differential signal hole pairs 321. In this way, the spacing between the two adjacent first differential signal hole pairs 321 can be increased, and signal crosstalk between the two adjacent first differential signal hole pairs 321 can be reduced. In addition, the PCB according to this embodiment may further include a third row structural unit, a fourth row structural unit, etc. (not shown), and the second row structural unit 330 and the third row structural unit may be arranged sequentially along the second direction or may be arranged sequentially along a third direction (not shown), where the third direction intersects with the second direction and the first direction.

[0041] In some embodiments, the plurality of second ground holes 332 are arranged in sequence along the first direction.

[0042] Further, in some embodiments, the PCB further includes a second signal line 350, which is located in the first wiring lead-out layer 313 and between the first row structural unit 320 and the second row structural unit 330. The second signal line 350 includes a bent portion 351 and an extending portion 352. The bent portion 351 is bent from one of the first differential signal hole pairs 321 of the first row structural unit 320 along a direction away from the first row structural unit 320 and close to the extending portion 352, and extends to the extending portion 352. The extending portion 352 is located on the side of the bent portion 351 away from the first signal line 340 and extends along the first direction. The first differential signal hole pair 321 connected to the bent portion 351 is different from the first differential signal hole pair 321 connected to the first signal line 340.

[0043] Some embodiments of the present application provide a signal transmission system including a PCB. Since the PCB according to some embodiments of the present application is the same as another PCB according to some embodiments described above, the PCB included in the signal transmission system according to some embodiments of the present application also has the same technical effect as another PCB according to some embodiments described above, and details will not be described here.

[0044] Furthermore, in some embodiments, the signal transmission system further includes a connector, which includes a main body and a plurality of terminals all fixed to the main body, and portions of the plurality of first differential signal hole pairs, the plurality of first ground holes, the plurality of second differential signal hole pairs and the plurality of second ground holes located within the first substrate block are each inserted into one of the plurality of terminals.

Claims

1. The substrate includes a substrate body (110), a first row structural unit (120), a second row structural unit (130), and a first signal line (140); The substrate body (110) is provided with a first substrate block (111) and a second substrate block (112) in that order along its thickness direction, and the second substrate block (112) has a first wiring lead layer (113), the first row structure unit (120) includes a plurality of first differential signal hole pairs (121) and a plurality of first ground holes (122), the plurality of first differential signal hole pairs (121) are arranged in sequence along a first direction, at least one first ground hole (122) is arranged between two adjacent first differential signal hole pairs (121), each of the first differential signal hole pairs (121) and each of the first ground holes (122) penetrates the first substrate block (111) and the second substrate block (112), the first row structure unit (120) and the second row structure unit (130) are arranged in sequence along a second direction, the first direction intersects with the second direction, The second row structural unit (130) includes a plurality of via holes (131), the plurality of via holes (131) being arranged in order along the first direction, the plurality of via holes (131) including a first via hole (132) and a second via hole (133) immediately adjacent to the first via hole (132), the first via hole (132) and the second via hole (133) both penetrating the first substrate block (111) and the second substrate block (112), the first via hole (132) including a first hole segment (134) and a second hole segment (135), the second via hole (133) being , a third hole segment (136) and a fourth hole segment (137), wherein the first hole segment (134) and the third hole segment (136) are located within the first substrate block (111), and a spacing between the first hole segment (134) and the third hole segment (136) is a first spacing; the second hole segment (135) and the fourth hole segment (137) are located within the second substrate block (112), and a spacing between the second hole segment (135) and the fourth hole segment (137) is a second spacing, and the first spacing is smaller than the second spacing; The first signal line (140) is located in the first wiring lead-out layer (113), and the first signal line (140) extends from one of the first differential signal hole pairs (121) of the first row structural unit (120), passing between the second hole segment (135) and the fourth hole segment (137), to a side of the second row structural unit (130) away from the first row structural unit.

2. 2. The printed circuit board of claim 1, wherein an axis of the first hole segment (134) does not overlap an axis of the second hole segment (135), and / or a diameter of the first hole segment (134) is larger than a diameter of the second hole segment (135).

3. 3. The printed circuit board of claim 2, wherein an axis of the third hole segment (136) does not overlap an axis of the fourth hole segment (137), and / or a diameter of the third hole segment (136) is greater than a diameter of the fourth hole segment (137).

4. The printed circuit board according to any one of claims 1 to 3, wherein the plurality of via holes (131) of the second row structural unit (130) are a plurality of differential signal holes (101) and a plurality of second ground holes (138), the plurality of differential signal holes (101) are arranged in sequence along the first direction, two immediately adjacent differential signal holes (101) form a second differential signal hole pair (139), and at least one second ground hole (138) is arranged between two adjacent second differential signal hole pairs (139).

5. 5. The printed circuit board of claim 4, wherein the first via hole (132) and the second via hole (133) are two differential signal holes (101) in one second differential signal hole pair (139).

6. further comprising a second signal line (150); The substrate body (110) further includes a second wiring lead layer (114), the second wiring lead layer (114) being located on the first substrate block (111) or the second substrate block (112); 6. The printed circuit board of claim 5, wherein the second signal line (150) is located in the second wiring lead-out layer (114), the second signal line (150) includes a first connection line (151) and a second connection line (152), and the first connection line (151) and the second connection line (152) are connected to the first via hole (132) and the second via hole (133), respectively.

7. 5. The printed circuit board of claim 4, wherein the first via hole (132) is adjacent to the second via hole (133), and the first via hole (132) and the second via hole (133) are one of the differential signal holes (101) and one of the second ground holes (138).

8. 5. The printed circuit board of claim 4, wherein the first via hole (132) and the second via hole (133) are two ground holes (138) provided between two adjacent second differential signal hole pairs (139).

9. further comprising a third signal line (160); The third signal line (160) is located in the first wiring lead-out layer (113) and is located between the first column structural unit (120) and the second column structural unit (130). The third signal line (160) includes a bent portion (161) and an extending portion (162). The bent portion (161) extends from the first differential signal hole pair (121) of one of the first column structural units (120) to the extending portion (162) away from the first column structural unit (120).

2. The printed circuit board of claim 1, wherein the first differential signal hole pair (121) is bent along a direction adjacent to the bent portion (161) and extends to the extension portion (162), the extension portion (162) is located on a side of the bent portion (161) away from the first signal line (140) and extends along the first direction, and the first differential signal hole pair (121) connected to the bent portion (161) is different from the first differential signal hole pair (121) connected to the first signal line (140).

10. The substrate includes a substrate body (310), a first row structural unit (320), a second row structural unit (330), and a first signal line (340); The substrate body (310) is provided with a first substrate block (311) and a second substrate block (312) in that order along its thickness direction, and the second substrate block (312) has a first wiring lead layer (313); the first row structure unit (320) includes a plurality of first differential signal hole pairs (321) and a plurality of first ground holes (322), the plurality of first differential signal hole pairs (321) are arranged in sequence along a first direction, at least one first ground hole (322) is arranged between two adjacent first differential signal hole pairs (321), each of the first differential signal hole pairs (321) and each of the first ground holes (322) penetrates the first substrate block (311) and the second substrate block (312), the first row structure unit (320) and the second row structure unit (330) are arranged in sequence along a second direction, the first direction intersects with the second direction, The second row structure unit (330) includes a plurality of second differential signal hole pairs (331) and a plurality of second ground holes (332), the plurality of second differential signal hole pairs (331) being arranged in sequence along the first direction, and two adjacent second ground holes (332) being arranged between two adjacent second differential signal hole pairs (331), and each of the second differential signal hole pairs (331) and each of the second ground holes (332) both penetrating the first substrate block (311) and the second substrate block (312); The first signal line (340) is located in the first wiring lead-out layer (313), and the first signal line (340) extends from one of the first differential signal hole pairs (321) of the first column structural unit (320) to a side of the second column structural unit (330) away from the first column structural unit (320) via the two immediately adjacent second ground holes (332); further comprising a second signal line (350); The second signal line (350) is located in the first wiring lead-out layer (313) and is located between the first column structural unit (320) and the second column structural unit (330). The second signal line (350) includes a bent portion (351) and an extending portion (352). The bent portion (351) extends from the first differential signal hole pair (321) of one of the first column structural units (320) to a front end away from the first column structural unit (320). a printed circuit board, wherein the first differential signal hole pair (321) connected to the bent portion (351) is different from the first differential signal hole pair (321) connected to the first signal line (340), and the first differential signal hole pair (321) is bent along a direction close to the extending portion (352) and extends to the extending portion (352), the extending portion (352) is located on a side of the bent portion (351) away from the first signal line (340) and extends along the first direction.

11. A signal transmission system comprising the printed circuit board according to any one of claims 1 to 10.

12. further comprising a connector; The printed circuit board is the printed circuit board according to any one of claims 1 to 9, The connector includes a body and a plurality of terminals, each of which is fixed to the body; 12. The signal transmission system according to claim 11, wherein the portions of the first differential signal hole pairs, the first ground holes, and the via holes located within the first substrate block are each inserted into one of the terminals.

13. Further comprising a connector; The printed circuit board is the printed circuit board according to claim 10, The connector includes a body and a plurality of terminals, each of which is fixed to the body; 12. The signal transmission system according to claim 11, wherein portions of the first differential signal hole pairs, the first ground holes, the second differential signal hole pairs, and the second ground holes located within the first substrate block are each inserted into one of the terminals.

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