Differential circuit structure capable of resisting common-mode interference, PCB (Printed Circuit Board) and filter

Abstract

The utility model provides an anti-common-mode-interference differential circuit structure, a PCB circuit board and a filter. The differential circuit structure resistant to common-mode interference comprises a pair of differential signal input ends and a pair of differential signal output ends which are arranged on a PCB, and a convolution circuit structure is arranged between the differential signal input ends and the differential signal output ends. The convolution circuit structure is used for generating a superposed magnetic field when a common-mode interference signal is generated between the differential signal input end and the differential signal output end so as to filter the common-mode interference signal.

Description

Technical Field

[0001] This utility model relates to the field of electronic circuit structure technology, and in particular to a differential circuit structure for resisting common-mode interference, a PCB circuit board, and a filter. Background Technology

[0002] In recent years, with the upgrading of communication technology for State Grid electricity meters, communication units have gradually transitioned from 2G to LTE or 5G networks, while the communication interface has also changed from the traditional UART serial port to a USB interface. However, this transition has brought new problems, namely, the anti-interference capability of the USB interface is significantly weakened compared to the serial port, especially when facing the State Grid's ESD (electrostatic discharge) and EFT (electrical fast transient) common-mode interference tests, communication reliability drops sharply. Utility Model Content

[0003] This invention aims to at least partially solve one of the technical problems in related technologies. Therefore, the first objective of this invention is to propose a differential circuit structure that resists common-mode interference, improving the suppression of common-mode interference by the differential circuit without adding additional components, while avoiding increasing the suppression of differential-mode interference, thereby effectively enhancing the anti-interference capability of the differential circuit.

[0004] The second objective of this utility model is to provide a PCB circuit board.

[0005] The third objective of this invention is to provide a filter.

[0006] To achieve the above objectives, the first aspect of this utility model proposes a differential circuit structure for resisting common-mode interference, including a pair of differential signal input terminals and a pair of differential signal output terminals disposed on a PCB circuit board, and a cyclotron circuit structure disposed between the differential signal input terminals and the differential signal output terminals.

[0007] The cyclotron circuit structure is used to generate a superimposed magnetic field when a common-mode interference signal is generated between the differential signal input and differential signal output terminals, so as to filter the common-mode interference signal.

[0008] In addition, the differential line structure for resisting common-mode interference according to the above embodiments of this utility model may also have the following additional technical features:

[0009] As an optional embodiment, the spiral circuit structure includes an inner spiral circuit and an outer spiral circuit, with the inner spiral circuit and the outer spiral circuit being routed synchronously; wherein, part of the inner spiral circuit is wavy.

[0010] As an optional embodiment, the inner spiral circuit is the same length as the outer spiral circuit.

[0011] As an optional embodiment, the differential signal input, differential signal output, and cyclotron circuit structure are located on the same layer of the PCB circuit board.

[0012] As an alternative embodiment, the cyclotron circuit structure is configured to rotate from the inside out to the differential signal output terminal starting from the differential signal input terminal, or to rotate from the outside in to the differential signal output terminal forming the rotation center of the cyclotron circuit structure.

[0013] As an optional embodiment, the cyclone circuit structure is constructed as a ring-shaped cyclone structure.

[0014] As an alternative embodiment, the toroidal spiral structure is a regular hexagon, a circle, or a rectangle.

[0015] As an optional embodiment, a pair of differential signal input terminals includes a first input terminal and a second input terminal; a pair of differential signal output terminals includes a first output terminal and a second output terminal;

[0016] The first input terminal is adapted to be connected to the positive data signal interface of the communication module, the second input terminal is adapted to be connected to the negative data signal interface of the communication module, the first output terminal is adapted to be connected to the positive data signal interface of the target terminal, and the second output terminal is adapted to be connected to the negative data signal interface of the target terminal.

[0017] According to an embodiment of the present invention, a differential circuit structure for common-mode interference suppression is provided, comprising a pair of differential signal input terminals and a pair of differential signal output terminals disposed on a PCB circuit board, with a cyclotron circuit structure disposed between the differential signal input terminals and the differential signal output terminals. The cyclotron circuit structure is used to generate a superimposed magnetic field when a common-mode interference signal is generated between the differential signal input terminals and the differential signal output terminals, thereby filtering the common-mode interference signal. This achieves improved suppression of common-mode interference by the differential circuit without adding additional components, while avoiding increased suppression of differential-mode interference, thus effectively enhancing the anti-interference capability of the differential circuit.

[0018] To achieve the above objectives, a second aspect of this utility model provides a PCB circuit board, which includes the aforementioned differential circuit structure for resisting common-mode interference.

[0019] The PCB circuit board according to an embodiment of this utility model is provided with a pair of differential signal input terminals and a pair of differential signal output terminals, and a cyclotron circuit structure is provided between the differential signal input terminals and the differential signal output terminals. The cyclotron circuit structure is used to generate a superimposed magnetic field when a common-mode interference signal is generated between the differential signal input terminals and the differential signal output terminals, so as to filter the common-mode interference signal. This achieves improved suppression of common-mode interference by the differential circuit without adding additional components, while avoiding increasing the suppression of differential mode, thereby effectively enhancing the anti-interference capability of the differential circuit.

[0020] To achieve the above objectives, a third aspect of this utility model provides a filter, including the aforementioned common-mode interference suppression circuit board.

[0021] According to an embodiment of this utility model, the filter comprises a pair of differential signal input terminals and a pair of differential signal output terminals disposed on a PCB circuit board, with a cyclotron circuit structure disposed between the differential signal input terminals and the differential signal output terminals. The cyclotron circuit structure is used to generate a superimposed magnetic field when a common-mode interference signal is generated between the differential signal input terminals and the differential signal output terminals, thereby filtering the common-mode interference signal. This achieves improved suppression of common-mode interference by the differential circuit without adding additional components, while avoiding increased suppression of differential-mode interference, thus effectively enhancing the anti-interference capability of the differential circuit.

[0022] Additional aspects and advantages of this invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0023] To more clearly illustrate the technical solutions in this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only for this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0024] Figure 1 This is a schematic diagram of a differential circuit structure in related technologies.

[0025] Figure 2 A schematic diagram of a differential circuit structure for resisting common-mode interference provided in an embodiment of this utility model.

[0026] Figure 3 A schematic diagram illustrating the application scenario of the differential line structure for resisting common-mode interference provided in this embodiment of the utility model.

[0027] Figure 4 A schematic diagram of a PCB circuit board provided for an embodiment of this utility model.

[0028] Figure 5 A schematic diagram of a filter provided for an embodiment of this utility model.

[0029] Figure label:

[0030] 100 - Differential circuit structure for common-mode interference suppression, 10 - Differential signal input terminal, 101 - First input terminal, 102 - Second input terminal, 20 - Differential signal output terminal, 201 - First output terminal, 202 - Second output terminal, 30 - Rotary circuit structure, 301 - Inner rotary circuit, 302 - Outer rotary circuit;

[0031] 40 - Communication module, 50 - Target terminal, D+ - Data positive signal interface, D- - Data negative signal interface, D++ - Target terminal data positive signal interface, D--- Target terminal data negative signal interface;

[0032] 400-PCB circuit board;

[0033] 500-Filter. Detailed Implementation

[0034] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to specific embodiments and accompanying drawings.

[0035] It should be noted that, unless otherwise defined, the technical or scientific terms used in this utility model should have the ordinary meaning understood by one of ordinary skill in the art to which this utility model pertains. The terms "first," "second," and similar terms used in this utility model do not indicate any order, quantity, or importance, but are merely used to distinguish different components. Terms such as "comprising" or "including" mean that the element or object preceding the word encompasses the elements or objects listed following the word and their equivalents, without excluding other elements or objects. Terms such as "connected" or "linked" are not limited to physical or mechanical connections, but can include electrical connections, whether direct or indirect. Terms such as "upper," "lower," "left," and "right" are used only to indicate relative positional relationships; when the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0036] As described in the background section, the motherboards inside computers and other electronic devices integrate high-frequency circuits, digital circuits, and analog circuits. These circuits generate a large amount of high-frequency electromagnetic waves during operation, leading to EMI (electromagnetic interference) problems. EMI not only causes mutual interference between circuits within the device but also emits electromagnetic radiation pollution through motherboard wiring or external cables, thus interfering with the normal operation of communication channels and other electrical equipment. Furthermore, electromagnetic interference can be divided into differential-mode interference and common-mode interference based on its generation principle, with common-mode interference being particularly prominent due to its greater susceptibility to spatial radiation. If the common-mode current generated in the circuit is not properly attenuated and filtered, it can easily generate common-mode radiation in the cables through interface data lines. This not only affects the performance of the device but may also cause the device to fail to meet the EMC (electromagnetic compatibility) regulations of various countries. Therefore, solving the EMI problem inside electronic devices, especially the common-mode interference problem, has become an urgent technical challenge.

[0037] In developing this utility model, the applicant discovered that while current common-mode inductor or serpentine routing designs offer some effectiveness in suppressing electromagnetic interference (EMI), they suffer from several insurmountable drawbacks. First, high cost is a significant issue, especially when a common-mode inductor is required for each port or line, drastically increasing the overall cost. Second, the complex structure and manufacturing requirements of common-mode inductors, coupled with their series connection in the circuit, reduce the reliability of the entire system. Furthermore, the significant insertion loss introduced by common-mode inductors negatively impacts signal quality, making it difficult to find a balance between EMI suppression and signal integrity (SI). Finally, considering the increased cost and introduced risks, using these designs solely for EMI suppression is not cost-effective. Therefore, there is an urgent need to develop a differential circuit structure that effectively suppresses EMI while reducing cost, improving reliability, minimizing insertion loss, and enhancing cost-effectiveness.

[0038] The technical solution of this utility model will be further described in detail below through specific embodiments.

[0039] refer to Figure 1 This is a schematic diagram of a differential circuit structure in related technologies.

[0040] First, during PCB (Printed Circuit Board) layout and routing, if the USB differential lines are designed as straight lines, they may be obstructed by other components and traces, increasing routing difficulty. Especially in densely populated component areas, straight traces may conflict with other signal lines. Second, one of the design principles of differential lines is to maintain the same length, width, and close proximity of the two lines, ideally on the same plane. If the differential lines are routed as straight lines, these principles may not be maintained due to constraints from other components or traces, thus affecting signal quality. Furthermore, straight differential lines may limit the flexibility of circuit design. In some cases, designers may want to adjust the routing of differential lines according to component placement and signal transmission requirements. However, if the differential lines are routed as straight lines, this flexibility will be limited, potentially leading to poor overall design performance.

[0041] refer to Figure 2 This is a schematic diagram of a differential circuit structure for resisting common-mode interference provided in an embodiment of this utility model.

[0042] The differential circuit structure 100 for common-mode interference suppression provided by this utility model includes a pair of differential signal input terminals 10 and a pair of differential signal output terminals 20 disposed on a PCB circuit board 400. A cyclotron circuit structure 30 is disposed between the differential signal input terminals 10 and the differential signal output terminals 20. The cyclotron circuit structure 30 is used to generate a superimposed magnetic field when a common-mode interference signal is generated between the differential signal input terminals 10 and the differential signal output terminals 20, so as to filter the common-mode interference signal.

[0043] Specifically, the differential signal input terminal 10 is used to receive differential signals. Differential signaling is a signal transmission method in which two signals (forward and reverse signals) are transmitted on the same transmission line with opposite phases to carry information. The differential signal output terminal 20 is used to output the processed differential signal. During signal transmission, differential signals have advantages such as strong anti-interference capability and effective suppression of electromagnetic interference.

[0044] When differential signals are transmitted on PCB traces, common-mode interference may be generated if they are affected by external environmental interference (such as electromagnetic fields, power fluctuations, etc.). Common-mode interference refers to interference in the same direction that simultaneously affects both the positive and negative signals in the differential signal pair. When common-mode interference is generated, a superimposed magnetic field is formed inside the cyclotron circuit. This superimposed magnetic field interacts with the common-mode interference signal, thereby changing its propagation path or weakening its intensity, achieving the effect of filtering or suppressing the common-mode interference signal.

[0045] As an optional embodiment, the spiral circuit structure 30 includes an inner spiral circuit 301 and an outer spiral circuit 302, with the inner spiral circuit 301 and the outer spiral circuit 302 running synchronously; wherein, a portion of the inner spiral circuit 301 is wavy.

[0046] As an optional embodiment, the inner spiral line 301 and the outer spiral line 302 have the same length.

[0047] Specifically, the cyclotron circuit structure 30 in this embodiment includes an inner cyclotron circuit 301 and an outer cyclotron circuit 302. These two circuits are closely coordinated in their layout to form a complete anti-interference structure. The inner cyclotron circuit 301 is located inside the cyclotron circuit structure 30, while the outer cyclotron circuit 302 surrounds the inner cyclotron circuit 301. This layout helps to form an effective magnetic field barrier during differential signal transmission to suppress common-mode interference signals. The inner cyclotron circuit 301 and the outer cyclotron circuit 302 maintain synchronization in their routing, meaning that their line lengths, curvatures, and directions are generally consistent. This synchronization not only enhances the suppression of common-mode interference signals by the cyclotron circuit structure 30 but also improves the stability and reliability of the entire differential circuit structure.

[0048] When a differential signal is transmitted on a PCB trace, if it is affected by common-mode interference, the inner cyclotron circuit 301 and the outer cyclotron circuit 302 will jointly generate a superimposed magnetic field. This superimposed magnetic field will interact with the common-mode interference signal, thereby changing its propagation path or weakening its intensity.

[0049] It should be noted that since the inner spiral line 301 and the outer spiral line 302 are synchronized in their routing, but there is an "inner loop" and an "outer loop" between them, in order to maintain the same length between the inner spiral line 301 and the outer spiral line 302, the starting part of the inner spiral line 301 is designed with a wavy routing. This wavy routing method creates more bends and folds in the line in space, increasing the length of the line. Therefore, adding wavy routing can "align" the lengths, making the inner spiral line 301 and the outer spiral line 302 the same.

[0050] As an alternative embodiment, the cyclotron circuit structure 30 is configured to cyclotron from the inside out of the differential signal input terminal 10 to the differential signal output terminal 20, or to cyclotron from the outside in of the differential signal input terminal 10 to the differential signal output terminal 20, which forms the cyclotron center of the cyclotron circuit structure 30.

[0051] Specifically, when the cyclotron circuit structure 30 is configured to spiral outwards: In this arrangement, the cyclotron circuit structure 30 starts from the differential signal input terminal 10 and extends outwards along a gradually expanding spiral or loop path, eventually reaching the differential signal output terminal 20. The advantage of this arrangement is that, as the signal is transmitted, the cyclotron circuit structure 30 can gradually expand its magnetic field coverage, thereby more effectively suppressing potential common-mode interference signals. Furthermore, the inside-out spiral arrangement also helps to gradually disperse and weaken interference signals during signal transmission, protecting the integrity of the differential signal.

[0052] Specifically, when the cyclotron line structure 30 is configured to spiral inward: In this arrangement, the cyclotron line structure 30 starts from the differential signal input terminal 10 and spirals inward along a gradually decreasing spiral or circular path, eventually reaching the differential signal output terminal 20 located at the center of the spiral. The advantage of this arrangement is that it can gradually focus and guide interfering signals to the center of the spiral during signal transmission, thereby utilizing the magnetic field effect of the cyclotron line structure 30 to suppress and eliminate these interferences. The outward-to-inward spiral arrangement may also reduce the coupling effect between lines to some extent, thus reducing interference between differential signals.

[0053] In both of the above configurations, the cyclotron circuit structure 30 interacts with the common-mode interference signal by generating a superimposed magnetic field, thereby altering its propagation path or weakening its intensity. Different cyclotron directions may affect the distribution of the magnetic field and the suppression effect of the interference signal, but both can improve the transmission quality of the differential signal to some extent.

[0054] As an alternative embodiment, the cyclone circuit structure 30 is configured as a ring-shaped cyclone structure.

[0055] Specifically, the ring-loop structure is a special type of loop circuit layout in which the circuit loops along a closed loop path. This structure has a significant advantage in suppressing common-mode interference signals because it can form a closed magnetic field barrier, effectively isolating interference signals from the outside. Another advantage of the ring-loop structure is that it can provide sufficient space to arrange complex circuit layouts while maintaining a relatively short circuit length, thereby meeting specific design requirements.

[0056] As an alternative embodiment, the toroidal spiral structure is a regular hexagon, a circle, or a rectangle.

[0057] Specifically, in these alternative embodiments, the toroidal spiral structure is embodied as a regular hexagon, circle, or rectangle. The choice of toroidal spiral structure depends on factors such as specific layout requirements, space constraints, and design aesthetics. For example, a regular hexagonal toroidal spiral structure has six equal sides and six equal angles; this symmetry helps to suppress interference signals uniformly in multiple directions. A circular toroidal spiral structure provides a continuous and smooth circuit path, helping to reduce coupling effects and interference between circuits. A rectangular toroidal spiral structure is more suitable for arranging circuits in limited space while still providing sufficient magnetic field barriers to suppress interference signals.

[0058] In summary, the toroidal gyro structure suppresses common-mode interference signals by forming a closed magnetic field barrier. When the differential signal is transmitted within the toroidal gyro structure, the interference signal is isolated from the outside by the magnetic field barrier, thus protecting the integrity of the differential signal.

[0059] refer to Figure 3 This is a schematic diagram of an application scenario for the differential line structure 100 for resisting common-mode interference provided in this embodiment of the present utility model.

[0060] As an optional embodiment, the differential signal input terminal 10 includes a first input terminal 101 and a second input terminal 102; the differential signal output terminal 20 includes a first output terminal 201 and a second output terminal 202; the first input terminal 101 is adapted to be connected to the positive data signal interface D+ of the communication module 40, the second input terminal 102 is adapted to be connected to the negative data signal interface D- of the communication module 40, the first output terminal 201 is adapted to be connected to the positive data signal interface D++ of the target terminal 50, and the second output terminal 202 is adapted to be connected to the negative data signal interface D-- of the target terminal 50.

[0061] Typically, the communication module 40 communicates with the target terminal 50 via a USB interface. Taking the communication between the power grid communication unit and the electricity meter as an example, the power grid communication unit includes the communication module 40. The input end of the differential line structure 100, which is resistant to common-mode interference, is connected to the USB input interface of the communication module 40, and the output end of the differential line structure 100 is connected to the connector. The electricity meter also has the same differential line structure 100, which is resistant to common-mode interference. The input end of the differential line structure 100 inside the electricity meter is connected to the connector to receive the differential signal transmitted by the communication module 40 of the power grid communication unit. The output end of the differential line structure 100 inside the electricity meter is connected to the MCU of the electricity meter to transmit the differential signal to the MCU of the electricity meter.

[0062] Specifically, the differential signal input terminal 10 includes a first input terminal 101 and a second input terminal 102. The first input terminal 101 is designed to connect to the positive data signal interface D+ of the communication module 40. The positive data signal typically represents a positive signal in the differential signal pair and carries information during communication. The second input terminal 102 is designed to connect to the negative data signal interface D- of the communication module 40. The negative data signal is the other signal in the differential signal pair, which, together with the positive data signal, constitutes a complete differential signal pair. The differential signal output terminal 20 includes a first output terminal 201 and a second output terminal 202. The first output terminal 201 is designed to connect to the positive data signal interface D++ of the target terminal 50. It is used to transmit the processed differential signal (i.e., the positive data signal) to the target terminal 50 (i.e., the electricity meter). The second output terminal 202 is designed to connect to the negative data signal interface D- of the target terminal 50. It is also used to transmit the processed differential signal (i.e., the negative data signal) to the target terminal 50 (i.e., the electricity meter).

[0063] In the above embodiment, the differential signal is introduced into the circuit through the differential signal input terminal 10 and processed by the cyclotron circuit structure 30 to suppress common-mode interference signals. Then, the processed differential signal is transmitted to the target terminal 50 (i.e., the electricity meter) through the differential signal output terminal 20. This differential signal transmission method not only ensures the integrity and accuracy of the signal during transmission but also effectively suppresses common-mode interference.

[0064] As can be seen from the above, the differential circuit structure for common-mode interference suppression provided by this utility model consists of a pair of differential signal input terminals and a pair of differential signal output terminals on a PCB circuit board, with a cyclotron circuit structure between the differential signal input terminals and the differential signal output terminals. The cyclotron circuit structure generates a superimposed magnetic field when a common-mode interference signal is generated between the differential signal input terminals and the differential signal output terminals, thereby filtering the common-mode interference signal. This achieves improved suppression of common-mode interference by the differential circuit without adding additional components, while avoiding increased suppression of differential-mode interference, thus effectively enhancing the anti-interference capability of the differential circuit.

[0065] Based on the same inventive concept, corresponding to the differential circuit structure for common-mode interference suppression provided in any of the above embodiments, this utility model also provides a PCB circuit board 400, which includes the aforementioned differential circuit structure 100 for common-mode interference suppression.

[0066] refer to Figure 4 This is a schematic diagram of a PCB circuit board provided in an embodiment of the present utility model.

[0067] The PCB circuit board according to an embodiment of this utility model is provided with a pair of differential signal input terminals and a pair of differential signal output terminals, and a cyclotron circuit structure is provided between the differential signal input terminals and the differential signal output terminals. The cyclotron circuit structure is used to generate a superimposed magnetic field when a common-mode interference signal is generated between the differential signal input terminals and the differential signal output terminals, so as to filter the common-mode interference signal. This achieves improved suppression of common-mode interference by the differential circuit without adding additional components, while avoiding increasing the suppression of differential mode, thereby effectively enhancing the anti-interference capability of the differential circuit.

[0068] Based on the same inventive concept, corresponding to the differential line structure for common-mode interference suppression described in any of the above embodiments, this utility model also provides a filter 500, including the circuit board 400 for common-mode interference suppression described above.

[0069] Figure 5 A schematic diagram of a filter provided for an embodiment of this utility model.

[0070] According to an embodiment of this utility model, the filter comprises a pair of differential signal input terminals and a pair of differential signal output terminals disposed on a PCB circuit board, with a cyclotron circuit structure disposed between the differential signal input terminals and the differential signal output terminals. The cyclotron circuit structure is used to generate a superimposed magnetic field when a common-mode interference signal is generated between the differential signal input terminals and the differential signal output terminals, thereby filtering the common-mode interference signal. This achieves improved suppression of common-mode interference by the differential circuit without adding additional components, while avoiding increased suppression of differential-mode interference, thus effectively enhancing the anti-interference capability of the differential circuit.

[0071] It should be noted that, unless otherwise defined, the technical or scientific terms used in the embodiments of this utility model should have the ordinary meaning understood by one of ordinary skill in the art to which this utility model pertains. The terms "first," "second," and similar words used in the embodiments of this utility model do not indicate any order, quantity, or importance, but are merely used to distinguish different components. Terms such as "comprising" or "including" mean that the element or object preceding the word covers the element or object listed after the word and its equivalents, without excluding other elements or objects. Terms such as "connected" or "linked" are not limited to physical or mechanical connections, but can include electrical connections, whether direct or indirect. Terms such as "upper," "lower," "left," and "right" are only used to indicate relative positional relationships; when the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0072] While the spirit and principles of this invention have been described with reference to several specific embodiments, it should be understood that this invention is not limited to the disclosed specific embodiments, and the division of aspects does not imply that features in these aspects cannot be combined for benefit; such division is merely for ease of description. This invention is intended to cover various modifications and equivalent arrangements included within the spirit and scope of the appended claims. The scope of the appended claims is to be interpreted in the broadest sense, thereby encompassing all such modifications and equivalent structures and functions.

Claims

1. A common mode rejection differential line structure, characterized by, The anti-common mode interference differential line structure (100) comprises a pair of differential signal input terminals (10) and a pair of differential signal output terminals (20) arranged on a PCB (400), and a gyrating line structure (30) arranged between the differential signal input terminals (10) and the differential signal output terminals (20). The gyrating line structure (30) is configured to generate a superimposed magnetic field when a common mode interference signal is generated between the differential signal input terminals (10) and the differential signal output terminals (20), so as to filter the common mode interference signal.

2. The common mode rejection differential line structure of claim 1, wherein, The gyrating line structure (30) comprises an inner gyrating line (301) and an outer gyrating line (302), and the inner gyrating line (301) is synchronous with the trace of the outer gyrating line (302); wherein part of the inner gyrating line (301) is in a wave shape.

3. The common mode rejection differential line structure of claim 2, wherein, The length of the inner gyrating line (301) is equal to that of the outer gyrating line (302).

4. The common mode rejection differential line structure of claim 3, wherein, The differential signal input terminals (10), the differential signal output terminals (20) and the gyrating line structure (30) are located on the same layer of the PCB (400).

5. The common mode rejection differential line structure of claim 4, wherein, The gyrating line structure (30) is configured to gyrate from the differential signal input terminals (10) to the differential signal output terminals (20) from inside to outside, or gyrate from the differential signal input terminals (10) to the differential signal output terminals (20) as the center of gyration of the gyrating line structure (30) from outside to inside.

6. The common mode rejection differential line structure of claim 5, wherein, The gyrating line structure (30) is configured as a ring-shaped gyrating structure.

7. The common mode rejection differential line structure of claim 6, wherein, The ring-shaped gyrating structure is a regular hexagon, a circle or a rectangle.

8. The common mode rejection differential line structure of claim 7, wherein, The pair of differential signal input terminals (10) comprises a first input terminal (101) and a second input terminal (102); and the pair of differential signal output terminals (20) comprises a first output terminal (201) and a second output terminal (202). The first input terminal (101) is adapted to be connected with a data positive signal interface (D+) of a communication module (40), the second input terminal (102) is adapted to be connected with a data negative signal interface (D-) of the communication module (40), the first output terminal (201) is adapted to be connected with a data positive signal interface (D++) of a target terminal (50), and the second output terminal (202) is adapted to be connected with a data negative signal interface (D--) of the target terminal (50).

9. A PCB wiring board, characterized by The anti-common mode interference differential line structure (100) according to any one of claims 1-8.

10. A filter, characterized by, The anti-common mode interference line board (400) according to claim 9.

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