CN219181749U

CN219181749U - PCB for high-speed differential signals

Info

Publication number: CN219181749U
Application number: CN202223394341.0U
Authority: CN
Inventors: 陈贝
Original assignee: Sanxinwei Electronic Technology Jiangsu Co ltd
Current assignee: Sanxinwei Electronic Technology Jiangsu Co ltd
Priority date: 2022-12-15
Filing date: 2022-12-15
Publication date: 2023-06-13
Anticipated expiration: 2032-12-15

Abstract

The utility model discloses a PCB for high-speed differential signals, which comprises a PCB main board and at least one differential signal line sub-board detachably connected with the PCB main board, wherein two differential wires with equal width and equal length are distributed on the top layer of the differential signal line sub-board, through holes electrically connected with the differential wires are arranged on the differential signal line sub-board at two ends of the differential wires, a first plug-in unit is led out through the through holes, a groove is formed in the PCB main board, a convex block matched with the groove is arranged on the differential signal line sub-board, and a second plug-in unit is electrically connected with the PCB main board. The utility model aims to provide a PCB for high-speed differential signals, which has a simple structure, can select differential signal wires with different lengths according to different application scenes, does not need to manufacture the PCB in a whole piece again, and is quite convenient to replace the differential signal wire sub-plates.

Description

PCB for high-speed differential signals

Technical Field

The utility model relates to the field of PCB boards, in particular to a PCB board for high-speed differential signals.

Background

Differential transmission is a signal transmission technique, and a first benefit of differential signals is that small signals can be easily identified because you are controlling the reference voltage. In a ground referenced system, the exact value of the measured signal depends on the consistency of 'ground' within the system. The further apart the signal source and signal receiver are, the greater the likelihood of a difference between their local voltage values. The signal value recovered from the differential signal is largely independent of the exact value of 'ground', but within a certain range. The second main benefit of differential signaling is that it is highly immune to external electromagnetic interference. One source of interference affects each end of the differential signal pair to approximately the same extent. Since the voltage difference determines the signal value, any identical disturbances occurring on the two conductors will thus be ignored. In addition to being less sensitive to interference, differential signals produce less EMI than single-ended signals. The differential signal provides a third benefit in that bipolar signals can be handled from the vessel accurately in a single power system. To handle the bipolar signal of a single ended, single power system, we have to establish a virtual ground at some arbitrary voltage between ground and the power rail. The positive signal is represented by a voltage above virtual ground and the negative signal is represented by a voltage below virtual ground. The virtual ground must then be properly distributed throughout the system. For differential signals, such a virtual ground is not required, which allows us to process and propagate bipolar signals with a high degree of fidelity without relying on the stability of the virtual ground.

For differential signals, the factor that affects them most is whether their impedances to ground are consistent, i.e. balance to ground, and the relative impedance effect between them is not particularly important, and the distributed capacitance is larger than the fading signal strength, and noise and interference are not introduced, i.e. the signal to noise ratio is not greatly affected.

Unlike conventional practice of one signal line and one ground line, differential transmission transmits signals on both lines, which have the same amplitude and opposite phases. The transmitted signals on these two wires are differential signals. The signal receiving end compares the difference value of the two voltages to judge the logic state sent by the sending end. On a circuit board, the differential trace must be two wires of equal length, equal width, in close proximity and at the same level. The differential signal is a numerical value representing the difference between two physical quantities. Differential signals, also known as differential mode signals, are relative to common mode signals.

The existing high-speed differential signals are routed in a fixed mode, so that the application scene is single and cannot be suitable for various scenes, and therefore it is very important to obtain a PCB for the high-speed differential signals, which overcomes the defects.

Disclosure of Invention

In order to solve the technical problems, the utility model provides a PCB for high-speed differential signals, which comprises a PCB main board and at least one differential signal line sub-board detachably connected with the PCB main board, wherein two differential wires with equal width and equal length are distributed on the top layer of the differential signal line sub-board, through holes electrically connected with the differential wires are arranged on the differential signal line sub-board at two ends of the differential wires, a first plug-in unit is led out through the through holes, a groove is formed in the PCB main board, a bump matched with the groove is arranged on the differential signal line sub-board, and a second plug-in unit is electrically connected with the PCB main board.

The via hole is connected with the first plug-in unit through the flexible circuit board, and the first plug-in unit is a pin header, or the via hole is directly and electrically connected with the pin header.

The lengths of the differential signal lines on the plurality of differential signal line sub-boards are different. The differential signal lines on at least one differential signal line sub-board are S-shaped.

The second plug-in component is a connecting seat or a pin header.

The utility model aims to provide a PCB for high-speed differential signals, which has a simple structure, can select differential signal wires with different lengths according to different application scenes, does not need to manufacture the PCB in a whole piece again, and is quite convenient to replace the differential signal wire sub-plates.

Drawings

FIG. 1 is a schematic diagram of a mating cross-section of the present utility model;

FIG. 2 is a front view of a differential signal line drop board of the present utility model;

FIG. 3 is a front view of a differential signal line drop panel of the present utility model;

FIG. 4 is a schematic diagram of a mating cross-section of the present utility model;

FIG. 5 is a perspective view of the structure of the present utility model;

reference numerals: 1-a PCB board main board; 2-dividing differential signal lines; 3-differential wiring; 4-via holes; 5-a first insert; 6-grooves; 7-bump; 8-a second insert.

Detailed Description

The utility model will be described in detail below with respect to certain specific embodiments thereof in order to better understand the utility model and thereby to more clearly define the scope of the utility model as claimed. It should be noted that the following description is only some embodiments of the inventive concept and is only a part of examples of the present utility model, wherein the specific direct description of the related structures is only for the convenience of understanding the present utility model, and the specific features do not naturally and directly limit the implementation scope of the present utility model.

Referring to the drawings, the utility model adopts the following technical scheme that the PCB board for high-speed differential signals comprises a PCB board main board 1 and at least one differential signal line sub-board 2 detachably connected with the PCB board main board 1, two differential wires 3 with equal width and equal length are distributed on the top layer of the differential signal line sub-board 2, through holes 4 electrically connected with the differential wires 3 are arranged on the differential signal line sub-board 2 at two ends of the differential wires 3, the through holes 4 are connected with and led out a first plug-in unit 5, a groove 6 is formed on the PCB board main board 1, a bump 7 matched with the groove 6 is integrally formed on the differential signal line sub-board 2, and a second plug-in unit 8 is electrically connected on the PCB board main board 1.

The PCB board main board 1 can be provided with a cylindrical groove, the differential signal line sub board 2 is integrally formed with a cylindrical bump 7 which is matched with the cylindrical groove, the two are spliced, and the two can rotate after being spliced, so that the flexibility of the installation space is increased. As shown in fig. 4, the differential signal line split board slightly has an angle with the PCB board main body 1.

The via hole 4 is connected with the first plug-in unit 5 through the flexible circuit board, the first plug-in unit 5 is a pin header, or the via hole 4 is directly and electrically connected with the pin header.

The differential signal line lengths on the plurality of differential signal line sub-boards 2 are different. The differential signal lines on at least one differential signal line sub-board 2 are S-shaped.

The second plug-in unit 8 is a connecting seat or a pin header.

The utility model aims to provide a PCB for high-speed differential signals, which has a simple structure, can select differential signal wires with different lengths according to different application scenes, does not need to manufacture the PCB in a whole, only needs to replace the differential signal wire sub-board 2, and is quite convenient.

When the PCB board is put into use, the suitable differential signal line sub-board 2 is selected and connected with the PCB board 1 through the pin header, and the PCB board 1 is not required to be manufactured.

The above description is not intended to limit the utility model to the particular embodiments disclosed, but to limit the utility model to the particular embodiments disclosed, as many variations, modifications, additions and substitutions are possible, without departing from the scope and spirit of the utility model as disclosed in the accompanying claims.

Claims

1. The utility model provides a PCB board for high-speed differential signal, includes PCB board mainboard (1), its characterized in that: still include at least one differential signal line minute board (2) of detachable connection with PCB board mainboard (1), cloth has two equal width, equilong differential wiring (3) on the top layer of differential signal line minute board (2), be equipped with on differential signal line minute board (2) at differential wiring (3) both ends and walk wire (3) electric connection's via hole (4), first plug-in components (5) are drawn forth in the connection of via hole (4), set up recess (6) on PCB board mainboard (1), be equipped with on differential signal line minute board (2) with recess (6) complex lug (7), electric connection has second plug-in components (8) on PCB board mainboard (1).

2. The PCB for high-speed differential signals of claim 1, wherein: the via hole (4) is connected with the first plug-in unit (5) through the flexible circuit board, and the first plug-in unit (5) is a pin header.

3. The PCB for high-speed differential signals of claim 1, wherein: the via holes (4) are directly and electrically connected with the pin headers.

4. The PCB for high-speed differential signals of claim 1, wherein: the lengths of the differential signal lines on the plurality of differential signal line sub-boards (2) are different.

5. The PCB for high-speed differential signals of claim 1, wherein: the second plug-in unit (8) is a connecting seat or a pin header.

6. The PCB for high-speed differential signals of claim 4, wherein: the differential wiring (3) on at least one differential signal line division board (2) is S-shaped.