阅读说明：本技术 印制电路板及信号传输系统 (Printed circuit board and signal transmission system ) 是由 张馨丹 魏仲民 易毕 任永会 毕煜 于 2021-09-23 设计创作，主要内容包括：本申请实施例涉及信号传输技术领域,特别涉及一种印制电路板,第一信号线自第一列结构单元的一个第一差分信号孔对、经由第二孔段与第四孔段之间延伸至第二列结构单元远离第一列结构单元的一侧；或,第一信号线自第一列结构单元的一个第一差分信号孔对、经由两个紧邻的第二地孔之间延伸至第二列结构单元远离第一列结构单元的一侧。本申请实施例还提供一种信号传输系统,包括上述的印制电路板。本申请实施例提供的印制电路板以及信号传输系统,在确保列结构单元中的多个差分信号孔对有信号线与其相连的情况下,可减少印制电路板板体的层数,从而降低印制电路板的制造成本。(The embodiment of the application relates to the technical field of signal transmission, in particular to a printed circuit board, wherein a first signal line extends from a first differential signal hole pair of a first row of structural units to one side of a second row of structural units, which is far away from the first row of structural units, through a space between a second hole section and a fourth hole section; or, the first signal line extends from one first differential signal hole pair of the first column structural unit to one side of the second column structural unit far away from the first column structural unit through between two adjacent second ground holes. The embodiment of the application also provides a signal transmission system, which comprises the printed circuit board. The printed circuit board and the signal transmission system provided by the embodiment of the application can reduce the layer number of the board body of the printed circuit board under the condition that the signal lines are connected with the differential signal holes in the row structural units, thereby reducing the manufacturing cost of the printed circuit board.)

1. A printed circuit board, comprising:

the panel comprises a panel body, a first row of structure units, a second row of structure units and a first signal wire;

the plate body is sequentially provided with a first plate and a second plate along the thickness direction of the plate body, and the second plate is provided with a first outgoing line layer;

the first column of structural units comprise a plurality of first differential signal hole pairs and a plurality of first ground holes, the first differential signal hole pairs are sequentially arranged along a first direction, at least one first ground hole is arranged between every two adjacent first differential signal hole pairs, each first differential signal hole pair and each first ground hole penetrate through the first plate and the second plate, the first column of structural units and the second column of structural units are sequentially arranged along a second direction, and the first direction is intersected with the second direction;

the second column of structural units comprise a plurality of via holes, the plurality of via holes are sequentially arranged along the first direction, the plurality of via holes comprise 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 through the first plate and the second plate, the first via hole comprises a first hole section and a second hole section, the second via hole comprises a third hole section and a fourth hole section, the first hole section and the third hole section are located in the first plate, the distance between the first hole section and the third hole section is a first distance, the second hole section and the fourth hole section are located in the second plate, the distance between the second hole section and the fourth hole section is a second distance, and the first distance is smaller than the second distance;

the first signal line is located on the first outgoing line layer, and extends from one of the first differential signal hole pairs of the first column of structural units to a side of the second column of structural units away from the first column of structural units via between the second hole section and the fourth hole section.

2. The printed circuit board of claim 1, wherein an axis of the first bore section is not coincident with an axis of the second bore section and/or a diameter of the first bore section is greater than a diameter of the second bore section.

3. The printed circuit board of claim 2, wherein an axis of the third bore section is not coincident with an axis of the fourth bore section and/or a diameter of the third bore section is greater than a diameter of the fourth bore section.

4. The printed circuit board according to any one of claims 1 to 3, wherein the plurality of via holes of the second column of structural units are a plurality of differential signal holes and a plurality of second ground holes, the plurality of differential signal holes are sequentially arranged along the first direction, two adjacent differential signal holes form a second differential signal hole pair, and at least one second ground hole is arranged between two adjacent second differential signal hole pairs.

5. The printed circuit board of claim 4, wherein the first via and the second via are two differential signal holes of one of the second pair of differential signal holes.

6. The printed circuit board of claim 5, further comprising: a second signal line;

the plate body is also provided with a second wire outlet layer, and the second wire outlet layer is positioned on the first plate or the second plate;

the second signal line is located the second goes out the line layer, the second signal line includes first connecting wire and second connecting wire, first connecting wire and the second connecting wire respectively with first via hole and the second via hole links to each other.

7. The printed circuit board of claim 4, wherein the first via is adjacent to the second via, and wherein the first via and the second via are one of the differential signal vias and one of the second ground vias.

8. The printed circuit board of claim 4, wherein the first via and the second via are two ground vias disposed between two adjacent pairs of the second differential signal vias.

9. The printed circuit board of claim 1, further comprising: a third signal line;

the third signal line is located first play line layer, just the third signal line is located first row of constitutional unit and between the second row of constitutional unit, the third signal line is including bending portion and extension, the bending portion certainly one of first row of constitutional unit first differential signal hole pair is along keeping away from first row of constitutional unit and being close to the direction of extension is buckled and is extended to the extension, the extension is located bending portion keeps away from one side of first signal line, and follows first direction extends, with bend the portion continuous first differential signal hole pair with the first signal line links to each other first differential signal hole pair is different.

10. A printed circuit board, comprising:

the panel comprises a panel body, a first row of structure units, a second row of structure units and a first signal wire;

the plate body is sequentially provided with a first plate and a second plate along the thickness direction of the plate body, and the second plate is provided with a first outgoing line layer;

the first column of structural units comprise a plurality of first differential signal hole pairs and a plurality of first ground holes, the first differential signal hole pairs are sequentially arranged along a first direction, at least one first ground hole is arranged between every two adjacent first differential signal hole pairs, each first differential signal hole pair and each first ground hole penetrate through the first plate and the second plate, the first column of structural units and the second column of structural units are sequentially arranged along a second direction, and the first direction is intersected with the second direction;

the second row of structural units comprise a plurality of second differential signal hole pairs and a plurality of second ground holes, the second differential signal hole pairs are sequentially arranged along the first direction, two adjacent second ground holes are arranged between every two adjacent second differential signal hole pairs, and each second differential signal hole pair and each second ground hole penetrate through the first plate and the second plate;

the first signal line is located on the first outgoing layer, and the first signal line extends from one first differential signal hole pair of the first column of structural units to one side of the second column of structural units far away from the first column of structural units through the space between the two adjacent second ground holes.

11. The printed circuit board of claim 10, further comprising: a second signal line;

the second signal line is located first play line layer, just the second signal line is located first row of constitutional unit and between the second row of constitutional unit, the second signal line is including bending portion and extension, the bending portion certainly one of first row of constitutional unit first differential signal hole pair is along keeping away from first row of constitutional unit and being close to the direction of extension is buckled and is extended to the extension, the extension is located bending portion keeps away from one side of first signal line, and follows first direction extends, with bend the portion continuous first differential signal hole pair with first signal line links to each other first differential signal hole pair is different.

12. A signal transmission system, comprising: a printed circuit board according to any one of claims 1 to 11.

13. The signal transmission system of claim 12, further comprising: a connector; the printed circuit board is a printed circuit board according to any one of claims 1 to 9;

the connector includes a body and a plurality of terminals each fixed to the body;

the first differential signal hole pairs, the first ground holes and the via holes are plugged with one of the terminals respectively.

14. The signal transmission system of claim 12, further comprising: a connector; the printed circuit board is a printed circuit board according to claim 10 or 11;

the connector includes a body and a plurality of terminals each fixed to the body;

the first differential signal hole pairs, the first ground holes, the second differential signal hole pairs and the second ground holes are plugged into one of the terminals respectively.

Technical Field

The embodiment of the application relates to the technical field of signal transmission, in particular to a printed circuit board and a signal transmission system.

Background

With the development of science and technology, the ultra-high speed large capacity transmission system has been developed, wherein the high speed connector is one of the most important signal transmission devices of the ultra-high speed large capacity transmission system, and is widely applied to electronic equipment and is located at the key connection position of the electronic equipment.

Typically, high speed connectors are mated to the package structure of the printed circuit board by a fish-eye structure at the end of the pins. Referring to fig. 1, the package structure of the printed circuit board is composed of a plurality of column structure units on a board body of the printed circuit board, each column structure unit includes a plurality of via holes sequentially arranged along a first direction, the plurality of via holes are composed of a plurality of differential signal hole pairs and a plurality of ground holes, the plurality of column structure units are sequentially arranged along a second direction, the first direction intersects with the second direction, wherein, the wiring mode of the packaging structure of the printed circuit board is that after the signal wires positioned on the wire outlet layer are connected with the differential signal hole pairs in a certain column of structural units, the wiring mode is single when the wiring is taken out from the gap between the row structure unit and the row structure unit connected with the row structure unit, so that only one signal wire can be taken out from each row structure unit on the same wiring layer, the number of the outgoing line layers needs to be increased so that the plurality of differential signal holes in the column structure units are connected with the signal lines; the number of the outgoing line layers is increased, so that the layer number of the printed circuit board body is increased, and the manufacturing cost of the printed circuit board is higher.

Therefore, it is desirable to provide a printed circuit board and a signal transmission system, which can reduce the number of layers of the board body of the printed circuit board and thus reduce the manufacturing cost of the printed circuit board while ensuring that a plurality of differential signal holes in a row of structural units are connected with signal lines.

Disclosure of Invention

The present disclosure provides a printed circuit board and a signal transmission system, which can reduce the number of layers of a printed circuit board body and reduce the manufacturing cost of the printed circuit board under the condition that a plurality of differential signal holes in a column structure unit are connected to signal lines.

To achieve the above object, an embodiment of the present application provides a printed circuit board, including: the panel comprises a panel body, a first row of structure units, a second row of structure units and a first signal wire; the plate body is sequentially provided with a first plate and a second plate along the thickness direction of the plate body, and the second plate is provided with a first outgoing line layer; the first column of structural units comprise a plurality of first differential signal hole pairs and a plurality of first ground holes, the first differential signal hole pairs are sequentially arranged along a first direction, at least one first ground hole is arranged between every two adjacent first differential signal hole pairs, each first differential signal hole pair and each first ground hole penetrate through the first plate and the second plate, the first column of structural units and the second column of structural units are sequentially arranged along a second direction, and the first direction is intersected with the second direction; the second column of structural units comprise a plurality of via holes, the plurality of via holes are sequentially arranged along the first direction, the plurality of via holes comprise 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 through the first plate and the second plate, the first via hole comprises a first hole section and a second hole section, the second via hole comprises a third hole section and a fourth hole section, the first hole section and the third hole section are located in the first plate, the distance between the first hole section and the third hole section is a first distance, the second hole section and the fourth hole section are located in the second plate, the distance between the second hole section and the fourth hole section is a second distance, and the first distance is smaller than the second distance; the first signal line is located on the first outgoing line layer, and extends from one of the first differential signal hole pairs of the first column of structural units to a side of the second column of structural units away from the first column of structural units via between the second hole section and the fourth hole section.

In order to achieve the above object, an embodiment of the present application further provides a printed circuit board, including: the panel comprises a panel body, a first row of structure units, a second row of structure units and a first signal wire; the plate body is sequentially provided with a first plate and a second plate along the thickness direction of the plate body, and the second plate is provided with a first outgoing line layer; the first column of structural units comprise a plurality of first differential signal hole pairs and a plurality of first ground holes, the first differential signal hole pairs are sequentially arranged along a first direction, at least one first ground hole is arranged between every two adjacent first differential signal hole pairs, each first differential signal hole pair and each first ground hole penetrate through the first plate and the second plate, the first column of structural units and the second column of structural units are sequentially arranged along a second direction, and the first direction is intersected with the second direction; the second row of structural units comprise a plurality of second differential signal hole pairs and a plurality of second ground holes, the second differential signal hole pairs are sequentially arranged along the first direction, two adjacent second ground holes are arranged between every two adjacent second differential signal hole pairs, and each second differential signal hole pair and each second ground hole penetrate through the first plate and the second plate; the first signal line is located on the first outgoing layer, and the first signal line extends from one first differential signal hole pair of the first column of structural units to one side of the second column of structural units far away from the first column of structural units through the space between the two adjacent second ground holes.

In order to achieve the above object, an embodiment of the present application further provides a signal transmission system, including: the printed circuit board is provided.

According to the printed circuit board and the signal transmission system, the first plate and the second plate are sequentially arranged along the thickness direction of the board body, and the second plate is provided with a first outgoing line layer; the first column of structural units comprise a plurality of first differential signal hole pairs and a plurality of first ground holes, the first differential signal hole pairs are sequentially arranged along a first direction, at least one first ground hole is arranged between every two adjacent first differential signal hole pairs, each first differential signal hole pair and each first ground hole penetrate through the first plate and the second plate, the first column of structural units and the second column of structural units are sequentially arranged along a second direction, and the first direction is intersected with the second direction; the second column of structural units comprise a plurality of via holes, the plurality of via holes are sequentially arranged along the first direction, the plurality of via holes comprise 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 through the first plate and the second plate, the first via hole comprises a first hole section and a second hole section, the second via hole comprises a third hole section and a fourth hole section, the first hole section and the third hole section are located in the first plate, the distance between the first hole section and the third hole section is a first distance, the second hole section and the fourth hole section are located in the second plate, the distance between the second hole section and the fourth hole section is a second distance, and the first distance is smaller than the second distance; the first signal line is positioned on the first outgoing line layer, and extends from one first differential signal hole pair of the first column of structural units to one side of the second column of structural units far away from the first column of structural units through the space between the second hole section and the fourth hole section;

or the plate body is sequentially provided with a first plate and a second plate along the thickness direction of the plate body, and the second plate is provided with a first outgoing line layer; the first column of structural units comprise a plurality of first differential signal hole pairs and a plurality of first ground holes, the first differential signal hole pairs are sequentially arranged along a first direction, at least one first ground hole is arranged between every two adjacent first differential signal hole pairs, each first differential signal hole pair and each first ground hole penetrate through the first plate and the second plate, the first column of structural units and the second column of structural units are sequentially arranged along a second direction, and the first direction is intersected with the second direction; the second row of structural units comprise a plurality of second differential signal hole pairs and a plurality of second ground holes, the second differential signal hole pairs are sequentially arranged along the first direction, two adjacent second ground holes are arranged between every two adjacent second differential signal hole pairs, and each second differential signal hole pair and each second ground hole penetrate through the first plate and the second plate; the first signal line is positioned on the first outgoing layer, and the first signal line extends from one first differential signal hole pair of the first column of structural units to one side of the second column of structural units far away from the first column of structural units through the space between the two adjacent second ground holes;

the signal lines are enabled to have more wiring modes, so that the number of the signal lines which can be wired on each outgoing line layer can be increased, the number of the signal lines does not need to be increased in a mode of increasing the number of layers of the printed circuit board body, and the number of layers of the printed circuit board body can be reduced under the condition that the signal lines are connected with the differential signal holes in the first row of structural units, so that the manufacturing cost of the printed circuit board is reduced.

Drawings

Fig. 1 is a schematic structural diagram of a package structure of a printed circuit board provided in the background art, which is located at an outgoing line layer;

fig. 2 is a schematic structural diagram of a package structure of a printed circuit board located on a first outgoing line layer according to an embodiment of the present disclosure;

fig. 3 is a partial cross-sectional view of a board body of a printed circuit board according to an embodiment of the present application;

fig. 4 is a partial cross-sectional view of a printed circuit board provided in an embodiment of the present application;

fig. 5 is a partial cross-sectional view of a printed circuit board provided in one embodiment of the present application, in another embodiment of a board body;

fig. 6 is a schematic structural diagram of a printed circuit board according to an embodiment of the present application, in which a package structure in a further embodiment is located on a first outgoing line layer;

fig. 7 is a partial cross-sectional view of a printed circuit board provided in one embodiment of the present application, in a further embodiment of a board body;

fig. 8 is a schematic structural diagram of a printed circuit board provided in an embodiment of the present application, in which a package structure in another embodiment is located on a first outgoing line layer;

fig. 9 is a schematic structural diagram of a package structure of a printed circuit board located on a first outgoing line layer according to a third embodiment of the present application;

fig. 10 is a partial cross-sectional view of a board body of a printed circuit board according to a third embodiment of the present application.

Detailed Description

It will be appreciated by those of ordinary skill in the art that in the various embodiments of the present application, numerous technical details are set forth in order to provide a better understanding of the present application. However, the technical solution claimed in the present application can be implemented without these technical details and various changes and modifications based on the following embodiments. The following embodiments are divided for convenience of description, and should not constitute any limitation to the specific implementation manner of the present application, and the embodiments may be mutually incorporated and referred to without contradiction.

The printed circuit board is characterized in that a first plate and a second plate are sequentially arranged along the thickness direction of the board body, and the second plate is provided with a first outgoing line layer; the first column of structural units comprise a plurality of first differential signal hole pairs and a plurality of first ground holes, the first differential signal hole pairs are sequentially arranged along a first direction, at least one first ground hole is arranged between every two adjacent first differential signal hole pairs, each first differential signal hole pair and each first ground hole penetrate through the first plate and the second plate, the first column of structural units and the second column of structural units are sequentially arranged along a second direction, and the first direction is intersected with the second direction; the second column of structural units comprise a plurality of via holes, the plurality of via holes are sequentially arranged along the first direction, the plurality of via holes comprise 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 through the first plate and the second plate, the first via hole comprises a first hole section and a second hole section, the second via hole comprises a third hole section and a fourth hole section, the first hole section and the third hole section are located in the first plate, the distance between the first hole section and the third hole section is a first distance, the second hole section and the fourth hole section are located in the second plate, the distance between the second hole section and the fourth hole section is a second distance, and the first distance is smaller than the second distance; the first signal line is positioned on the first outgoing line layer, and extends from one first differential signal hole pair of the first column of structural units to one side of the second column of structural units far away from the first column of structural units through the space between the second hole section and the fourth hole section; the signal lines are enabled to have more wiring modes, so that the number of the signal lines which can be wired on each outgoing line layer can be increased, the number of the signal lines does not need to be increased in a mode of increasing the number of layers of the printed circuit board body, and the number of layers of the printed circuit board body can be reduced under the condition that the signal lines are connected with the differential signal holes in the first row of structural units, so that the manufacturing cost of the printed circuit board is reduced.

In order to make the purpose, technical solution and advantages of the first embodiment of the present application clearer, the first embodiment of the present application will be described in detail with reference to the accompanying drawings.

Referring to fig. 2 and 3, a PCB (Printed Circuit Board) according to an embodiment of the present invention includes: a board body 110, a first row of structure units 120, a second row of structure units 130, and a first signal line 140; the plate body 110 is sequentially provided with a first plate 111 and a second plate 112 along the thickness direction (X direction shown in fig. 3), and the second plate 112 is provided with a first outgoing line layer 113; the first row of structural units 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 sequentially arranged along a first direction (Y direction shown in fig. 2), at least one first ground hole 122 is arranged between two adjacent first differential signal hole pairs 121, each first differential signal hole pair 121 and each first ground hole 122 penetrate through the first plate 111 and the second plate 112, the first row of structural units 120 and the second row of structural units 130 are sequentially arranged along a second direction (Z direction shown in fig. 2), and the first direction intersects with the second direction; the second column structural unit 130 includes a plurality of via holes 131, the via holes 131 are sequentially arranged along a first direction, the via holes 131 include a first via hole 132 and a second via hole 133 adjacent to the first via hole 132, the first via hole 132 and the second via hole 133 both penetrate through the first plate 111 and the second plate 112, the first via hole 132 includes a first hole section 134 and a second hole section 135, the second via hole 133 includes a third hole section 136 and a fourth hole section 137, the first hole section 134 and the third hole section 136 are located in the first plate 111, a distance between the first hole section 134 and the third hole section 136 is a first distance W1, the second hole section 135 and the fourth hole section 137 are located in the second plate 112, a distance between the second hole section 135 and the fourth hole section 137 is a second distance W2, and the first distance W1 is smaller than the second distance W2; the first signal line 140 is located on the first outgoing line layer 113, and the first signal line 140 extends from one first differential signal hole pair 121 of the first column of structural units 120 to a side of the second column of structural units 130 away from the first column of structural units 120 through the space between the second hole segment 135 and the fourth hole segment 137.

Specifically, in the present embodiment, two first ground holes 122 are disposed between two adjacent first differential signal hole pairs 121, so that the spacing between two adjacent first differential signal hole pairs 121 can be increased, thereby reducing the signal crosstalk between two adjacent first differential signal hole pairs 121. In addition, it should be noted that the PCB provided in this embodiment may further include a third row of structural units, a fourth row of structural units, and the like (not shown in the figure), and the second row of structural units 130 and the third row of structural units may be sequentially disposed along the second direction, or may be sequentially disposed along a third direction (not shown in the figure), where the third direction intersects the second direction, and the third direction intersects the first direction.

Further, the axis of the first bore section 134 is not coincident with the axis of the second bore section 135 and/or the diameter of the first bore section 134 is larger than the diameter of the second bore section 135.

Referring to fig. 4, in one embodiment, the diameter of first bore segment 134 is the same as the diameter of second bore segment 135, and first spacing W1 is smaller than second spacing W2 by the misalignment of the axis of first bore segment 134 with the axis of second bore segment 135, specifically, the misalignment of the axis of first bore segment 134 with the axis of second bore segment 135 and the positioning of the axis of second bore segment 135 on the side of the axis of first bore segment 134 away from the axis of fourth bore segment 137, makes first spacing W1 smaller than second spacing W2; referring to fig. 5, in another embodiment, the axis of the first bore segment 134 coincides with the axis of the second bore segment 135, and the distance between the sidewall of the first bore segment 134 and the sidewall of the third bore segment 136 is greater than the distance between the sidewall of the second bore segment 135 and the sidewall of the fourth bore segment 137 by virtue of the diameter of the first bore segment 134 being greater than the diameter of the second bore segment 135, such that the first distance W1 is less than the second distance W2.

With continued reference to FIG. 3, in this embodiment, the axis of the first bore section 134 is not coincident with the axis of the second bore section 135 and the diameter of the first bore section 134 is greater than the diameter of the second bore section 135, such that the second spacing W2 may be further increased.

Further, the axis of third bore segment 136 is not coincident with the axis of fourth bore segment 137 and/or the diameter of third bore segment 136 is greater than the diameter of fourth bore segment 137.

With continued reference to FIG. 4, in one embodiment, the diameter of third bore segment 136 is the same as the diameter of fourth bore segment 137, such that first spacing W1 is less than second spacing W2 by the axis of third bore segment 136 not coinciding with the axis of fourth bore segment 137, specifically, the axis of third bore segment 136 is not coinciding with the axis of fourth bore segment 137 and the axis of fourth bore segment 137 is located on the side of the axis of third bore segment 136 away from the axis of first bore segment 134, such that first spacing W1 is less than second spacing W2; with continued reference to FIG. 5, in another embodiment, the axis of third bore segment 136 coincides with the axis of fourth bore segment 137, and by virtue of third bore segment 136 having a diameter that is greater than the diameter of fourth bore segment 137, the spacing between the sidewalls of third bore segment 136 and the sidewalls of first bore segment 134 may be made smaller than the spacing between the sidewalls of fourth bore segment 137 and the sidewalls of second bore segment 135, such that first spacing W1 is less than second spacing W2.

With continued reference to fig. 3, in this embodiment, the axis of third bore segment 136 is not coincident with the axis of fourth bore segment 137, and the diameter of third bore segment 136 is greater than the diameter of fourth bore segment 137, such that second spacing W2 may be maximized because the axis of first bore segment 134 is not coincident with the axis of second bore segment 135, and the diameter of first bore segment 134 is greater than the diameter of second bore segment 135.

Specifically, since the axis of the first hole section 134 of the PCB provided in this embodiment does not coincide with the axis of the second hole section 135, and the axis of the third hole section 136 does not coincide with the axis of the fourth hole section 137, in manufacturing the first via hole 132 and the second via hole 133 of the PCB provided in this embodiment, a first hole section 134 and a third hole section 136 may be formed by drilling on the side of the first board block 111 away from the second board block 112, and a second hole section 135 and a fourth hole section 137 may be formed by drilling on the side of the second board block 112 away from the first board block 111. In addition, since the diameter of the first hole section 134 of the PCB provided in this embodiment is greater than that of the second hole section 135, and the diameter of the third hole section 136 is greater than that of the fourth hole section 137, a large-diameter drill can be used when drilling the first hole section 134 and the third hole section 136 on the first board 111; when drilling the second block 112 to form the second bore section 135 and the fourth bore section 137, a small diameter drill may be used. The large-diameter drill and the small-diameter drill are relative, that is, the diameter of the large-diameter drill is larger than that of the small-diameter drill.

With reference to fig. 2, in the present embodiment, the vias 131 of the second column of structural units 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 sequentially arranged along the first direction, two adjacent differential signal holes 101 form a second differential signal hole pair 139, and at least one second ground hole 138 is disposed between two adjacent second differential signal hole pairs 139.

In addition, in the present embodiment, two adjacent second ground holes 138 are disposed 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 column of structural units 130 can be increased, and the signal crosstalk between two adjacent second differential signal hole pairs 139 can be reduced. Like the two "second vias 138" disposed between the adjacent two second differential signal hole pairs 139, the first via 132 and the second via 133 are also "two ground vias" disposed between the adjacent two second differential signal hole pairs 139.

Referring to fig. 6, in yet another embodiment, the first via 132 and the second via 133 are two differential signal holes of one second differential signal hole pair 139. Further, referring to fig. 7, the PCB further includes: a second signal line 150; the board body 110 further has a second wire outlet layer 114, and the second wire outlet layer 114 is located on the second board 112; the second signal line 150 is located on the second wire 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 respectively connected to the first via hole 132 and the second via hole 133. Since the first signal line 140 is located on the first outgoing line layer 113, and the first signal line 140 passes through the first via hole 132 and the second via hole 133, the second signal line 150 connected to the first via hole 132 and the second via hole 133 is located on the second outgoing line layer 114, that is, the outgoing line layer where the second signal line 150 is located is different from the outgoing line layer where the first signal line 140 is located, so that the second signal line 150 connected to the first via hole 132 and the second via hole 133 can be prevented from interfering with the first signal line 140. In addition, it should be noted that, in this embodiment, the second outgoing line layer may also be located on the first board block.

Referring to fig. 8, in another embodiment, the first via 132 is adjacent to the second via 133, and the first via 132 and the second via 133 are a differential signal via 101 and a second ground via 138, respectively.

Further, with continued reference to fig. 2 and 3, the PCB further includes: a third signal line 160; the third signal line 160 is located on the first outgoing line layer 113, the third signal line 160 is located between the first row of structural units 120 and the second row of structural units 130, the third signal line 160 includes a bending portion 161 and an extending portion 162, the bending portion 161 bends and extends to the extending portion 162 from one first differential signal hole pair 121 of the first row of structural units 120 along a direction away from the first row of structural units 120 and close to the extending portion 162, and the extending portion 162 is located on a side of the bending portion 161 away from the first signal line 140 and extends along the first direction, so that the extending portion 162 and the first signal line 140 can be prevented from interfering with each other; in addition, the first pair of differential signal holes 121 connected to the bent portion 161 is different from the first pair of differential signal holes 121 connected to the first signal line 140.

In addition, in the present embodiment, the first direction intersects but is not perpendicular to the second direction, such that the first differential signal hole pair 121 in the first column structure unit 120 and the second differential signal hole pair 139 in the second column structure unit 130 are misaligned, thereby reducing signal crosstalk between the first differential signal hole pair 121 in the first column structure unit 120 and the second differential signal hole pair 139 in the second column structure unit 130.

In addition, in the embodiment, the first differential signal hole pair 121 and the second differential signal hole pair 139 are through holes, and the PCB provided in the embodiment may be manufactured by drilling the first differential signal hole pair 121 and the second differential signal hole pair 139 on the second board 112 to remove the stubs of the first differential signal hole pair 121 and the second differential signal hole pair 139, so as to reduce the influence of the stubs of the first differential signal hole pair 121 and the second differential signal hole pair 139, and further improve the signal transmission performance of the first differential signal hole pair 121 and the second differential signal hole pair 139.

In one embodiment, the first pair of differential signal holes 121 and the second pair of differential signal holes 139 are blind holes, thus eliminating the need to drill the first pair of differential signal holes 121 and the second pair of differential signal holes 139 in the second board 112. In yet another embodiment, the first pair of differential signal holes 121 and the second pair of differential signal holes 139 are buried holes, and the buried holes comprise areas that contact fish-eye contacts of the high-count connector.

Still referring to fig. 3, in this embodiment, the board body 110 further includes a plurality of dielectric layers 115, a plurality of conductive planar layers 116, and a plurality of third outgoing layers 117, where the conductive planar layers 116, the first outgoing layers 113, and the third outgoing layers 117 are conductive layers, and the dielectric layers 115 are used for bonding two adjacent conductive layers and insulating the two adjacent conductive layers. In this embodiment, the number of the dielectric layer 115, the conductive plane layer 116 and the third outgoing line layer 117 of the board body is not limited, and the number of the dielectric layer 115, the conductive plane layer 116 and the third outgoing line layer 117 may be changed according to the actual application requirement of the PCB.

An embodiment of the present application provides a signal transmission system, including: a PCB is provided. The PCB provided in the second embodiment of the present application is the same as the PCB provided in the first embodiment of the present application, and therefore, the PCB included in the signal transmission system provided in the second embodiment of the present application also has the same technical effect as the PCB provided in the first embodiment of the present application, and details thereof are not repeated herein.

Further, the signal transmission system further includes: a connector including a body and a plurality of terminals, each of the plurality of terminals being fixed to the body; the first differential signal hole pairs, the first ground holes and the via holes are respectively plugged with one of the terminals.

The third embodiment of the application provides a printed circuit board, which is characterized in that a first plate and a second plate are sequentially arranged on a board body along the thickness direction of the board body, and the second plate is provided with a first outgoing line layer; the first column of structural units comprise a plurality of first differential signal hole pairs and a plurality of first ground holes, the first differential signal hole pairs are sequentially arranged along a first direction, at least one first ground hole is arranged between every two adjacent first differential signal hole pairs, each first differential signal hole pair and each first ground hole penetrate through the first plate and the second plate, the first column of structural units and the second column of structural units are sequentially arranged along a second direction, and the first direction is intersected with the second direction; the second row of structural units comprise a plurality of second differential signal hole pairs and a plurality of second ground holes, the second differential signal hole pairs are sequentially arranged along the first direction, two adjacent second ground holes are arranged between every two adjacent second differential signal hole pairs, and each second differential signal hole pair and each second ground hole penetrate through the first plate and the second plate; the first signal line is located on the first outgoing layer, and the first signal line extends from one first differential signal hole pair of the first column of structural units to one side of the second column of structural units far away from the first column of structural units through the space between the two adjacent second ground holes.

In order to make the objects, technical solutions and advantages of the third embodiment of the present application clearer, the third embodiment of the present application will be described in detail below with reference to the accompanying drawings.

Referring to fig. 9 and 10, a PCB provided in the third embodiment of the present application includes: a board body 310, a first row of structure units 320, a second row of structure units 330 and a first signal line 340; the plate body 310 is sequentially provided with a first plate 311 and a second plate 312 along the thickness direction (X direction shown in fig. 10), and the second plate 312 is provided with a first outgoing line layer 313; the first row of structure units 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 sequentially disposed along a first direction (Y direction shown in fig. 9), at least one first ground hole 322 is disposed between two adjacent first differential signal hole pairs 321, each first differential signal hole pair 321 and each first ground hole 322 penetrate through the first board 311 and the second board 312, the first row of structure units 320 and the second row of structure units 330 are sequentially disposed along a second direction (Z direction shown in fig. 9), and the first direction intersects 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 are sequentially disposed along the first direction, two adjacent second ground holes 332 are disposed between two adjacent second differential signal hole pairs 331, wherein each of the second differential signal hole pairs 331 and each of the second ground holes 332 penetrate through the first board 311 and the second board 312; the first signal line 340 is located on the first outgoing layer 313, and the first signal line 340 extends from one first differential signal hole pair 321 of the first column structure unit 320 to a side of the second column structure unit 330 away from the first column structure unit 320 via between two adjacent second ground holes 332.

Specifically, in the present embodiment, two first ground holes 322 are disposed between two adjacent first differential signal hole pairs 321, so that the distance between two adjacent first differential signal hole pairs 321 can be increased, thereby reducing the signal crosstalk between two adjacent first differential signal hole pairs 321. In addition, it should be noted that the PCB provided in this embodiment may further include a third row of structural units, a fourth row of structural units, and the like (not shown in the figure), and the second row of structural units 330 and the third row of structural units may be sequentially disposed along the second direction, or may be sequentially disposed along a third direction (not shown in the figure), where the third direction intersects the second direction, and the third direction intersects the first direction. In addition, in the present embodiment, the plurality of second ground holes 332 are sequentially arranged in the first direction.

Further, the PCB further includes: a second signal line 350; the second signal line 350 is located on the first outgoing line layer 313, the second signal line 350 is located between the first row of structural units 320 and the second row of structural units 330, the second signal line 350 includes a bending portion 351 and an extending portion 352, the bending portion 351 is bent and extended to the extending portion 352 from one first differential signal hole pair 321 of the first row of structural units 320 along a direction away from the first row of structural units 320 and close to the extending portion 352, the extending portion 352 is located on a side of the bending portion 351 away from the first signal line 340 and extends along the first direction, and the first differential signal hole pair 321 connected to the bending portion 351 is different from the first differential signal hole pair 321 connected to the first signal line 340.

An embodiment of the present application provides a signal transmission system, including: a PCB is provided. The PCB provided in the fourth embodiment of the present application is the same as the PCB provided in the third embodiment of the present application, and therefore, the PCB included in the signal transmission system provided in the fourth embodiment of the present application also has the same technical effect as the PCB provided in the third embodiment of the present application, and details thereof are not repeated herein.

Further, the signal transmission system further includes: a connector; the connector comprises a main body and a plurality of terminals, wherein the terminals are fixed on the main body; the first differential signal hole pairs, the first ground holes, the second differential signal hole pairs and the second ground holes are respectively plugged with one of the terminals.