Signal transmission cable

Abstract

The embodiment of the utility model provides a signal transmission cable, which comprises at least one stranded signal wire, and the stranded signal wire comprises a circuit signal wire and a signal reference ground wire. According to the utility model, the circuit signal wire for normally transmitting signals and the grounded signal reference ground wire are twisted, and the signal reference ground wire is used for shielding signals of other external circuit signal wires, so that the circuit signal wire twisted with the signal reference ground wire is protected, and electromagnetic compatibility is achieved.

Description

Technical Field

[0001] This utility model relates to the field of signal transmission technology, specifically to a signal transmission cable. Background Technology

[0002] As the size of electronic components continues to shrink, their power increases, and the integration of electronic devices becomes more sophisticated, the signal transmission interfaces of electronic components are becoming increasingly limited, making it impossible to arrange ideal multi-pin connectors. How to achieve signal shielding with a limited number of pins is an urgent problem to be solved. Utility Model Content

[0003] The purpose of this invention is to provide a signal transmission cable that solves the problem that existing signal transmission cables are easily interfered with by other signals.

[0004] In a first aspect, the present invention provides a signal transmission cable, the signal transmission cable including at least one twisted signal line, wherein the twisted signal line includes a circuit signal line and a signal reference ground line.

[0005] In some possible embodiments, the circuit signal line is a single-ended signal line, and the single-ended signal line and the signal reference ground line are twisted together.

[0006] In some possible embodiments, the circuit signal lines are a pair of differential signal lines, which are twisted together with the signal reference ground line.

[0007] In some possible embodiments, the stranded signal line further includes a signal shielding layer located outside the stranded signal line to wrap the circuit signal line and the signal reference ground line.

[0008] In some possible embodiments, the signal transmission cable includes a plurality of twisted signal wires.

[0009] In some possible embodiments, the signal transmission cable further includes cable filler for spacing the plurality of twisted signal lines.

[0010] In some possible embodiments, the cable filler is a plurality of discretely arranged fibers.

[0011] In some possible embodiments, the signal transmission cable further includes a tightly wound shielding layer located on the outside of the signal transmission cable for wrapping the twisted signal wires.

[0012] In some possible embodiments, the tightly wound shielding layer is made of a metallic material.

[0013] In some possible embodiments, cable connectors are provided at both ends of the signal transmission cable, and a shielding shell is formed on the outside of the cable connector to protect the cable connector. The two ends of the tightly wound shielding layer are respectively welded to the shielding shells at both ends of the signal transmission cable.

[0014] This invention provides a signal transmission cable, which includes at least one twisted signal wire, comprising a circuit signal wire and a signal reference ground wire. This invention achieves electromagnetic compatibility by twisting the normally transmitting circuit signal wire and the grounded signal reference ground wire together, using the signal reference ground wire to shield other external circuit signal wires. Attached Figure Description

[0015] The technical solution and other beneficial effects of this utility model will become apparent from the following detailed description of specific embodiments in conjunction with the accompanying drawings.

[0016] Figure 1 A schematic diagram of an embodiment of the signal transmission cable provided by this utility model;

[0017] Figure 2 This is a cross-sectional schematic diagram of an embodiment of the signal transmission cable provided in this utility model. Detailed Implementation

[0018] The present invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be particularly noted that the following embodiments are for illustrative purposes only and do not limit the scope of the present invention. Similarly, the following embodiments are only some, not all, embodiments of the present invention, and all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0019] In the following description of this utility model, "some embodiments" are used, which describe a subset of all possible embodiments. However, it is understood that "some embodiments" can be the same subset or different subsets of all possible embodiments, and can be combined with each other without conflict.

[0020] In the following description of this utility model, the terms "first, second, third" are used only to distinguish similar objects and do not represent a specific order of objects. It is understood that "first, second, third" can be interchanged in a specific order or sequence where permitted, so that the embodiments of this utility model described herein can be implemented in an order other than that illustrated or described herein.

[0021] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used herein is for the purpose of describing embodiments of the invention only and is not intended to limit the invention.

[0022] The following detailed description is provided with reference to specific embodiments. It should be noted that the sequence numbers of the embodiments are not intended to limit the preferred order of the embodiments. This utility model provides a signal transmission cable, and the signal transmission cable provided by this utility model will be described in detail below with reference to the accompanying drawings.

[0023] like Figure 1 The diagram shown is a structural schematic of an embodiment of the signal transmission cable provided by this utility model. Figure 1 In the illustrated embodiment, the signal transmission cable includes at least one twisted signal line, which in turn includes a circuit signal line 101 and a signal reference ground line 102. An electronic device typically includes multiple electrical interface pins, each capable of transmitting different signals. Some of these pins are connected to circuit signal lines for transmitting various signals, while others are connected to signal reference ground lines, which can be grounded to protect the signal transmission cable. During normal signal transmission, the simultaneous use of multiple circuit signal lines to transmit different signals can cause the magnetic fields generated by these lines to interfere with each other, affecting normal signal transmission. Therefore, it is necessary to protect and shield the signals transmitted by different circuit signal lines. In this invention, the circuit signal line 101 and the signal reference ground line 102 within the signal transmission cable are twisted together to obtain a twisted signal line including both the circuit signal line 101 and the signal reference ground line 102. In this way, for a twisted signal line, the signal reference ground 102 in the twisted signal line can be used to protect the circuit signal line 101, while shielding the signal influence of other circuit signal lines, effectively reducing the degree of signal interference, thereby achieving good electromagnetic compatibility characteristics.

[0024] In some embodiments, the circuit signal line can be a single-ended signal line, that is, signal transmission is carried out using a single signal line; in this case, the single-ended signal line is twisted together with the signal reference ground line to form a twisted-pair signal line. In other embodiments, since two differential signals are usually transmitted in actual signal transmission scenarios, when differential signals are transmitted, both differential signals are simultaneously affected by external electromagnetic interference. However, since the transmission lines containing the two differential signals are close together and have the same characteristic impedance, the noise received by the two differential signals is the same. The signal receiving end can subtract the voltages of the two differential signals to eliminate common-mode noise, thereby improving the signal-to-noise ratio, keeping the differential signals stable, and supporting higher signal transmission rates. When the cable transmits two differential signals, the circuit signal line is a pair of differential signal lines, and the pair of differential signal lines needs to be twisted together with a signal reference ground line to form a twisted-pair signal line. The twisted signal line at this time includes a pair of differential signal lines and a signal reference ground line. It should be noted that signal line twisting is a way of combining signal lines, and does not specifically refer to the combination of two lines; signal line twisting can be a circuit signal line (including a single-ended signal line or a pair of differential signal lines) and a signal reference ground line twisted together at a certain pitch (e.g., twisted once per centimeter).

[0025] Please refer to Figure 1 , Figure 1 The circuit signal lines in the circuit are single-ended signal lines. Figure 1 It includes four different circuit signal lines, each requiring a separate twisted pair with a four-way signal reference ground line; and Figure 1 The original signal reference ground wires only have two, which cannot be twisted together with four different circuit signal lines individually. Therefore, it is necessary to divide the signal reference ground wires into multiple strands and then evenly distribute these multiple strands among the multiple circuit signal lines. Specifically, the two original signal reference ground wires can be divided into two new signal reference ground wires, resulting in a total of four new cable connectors. These four signal reference ground wires are then evenly distributed among the four circuit signal lines to be twisted together, resulting in four twisted-pair signal lines. Each twisted-pair signal line includes one circuit signal line and one signal reference ground wire. That is, in actual signal transmission cables, if the number of original independent signal reference ground wires is less than the number of circuit signal lines, the signal reference ground wires can be split into strands to obtain more signal reference ground wires, so that each circuit signal line (or every two differential signal lines) is twisted together with one signal reference ground wire to obtain one twisted-pair signal line.

[0026] like Figure 2 The diagram shown is a schematic representation of another embodiment of the signal transmission cable provided by this utility model. Figure 2In the illustrated embodiment, the circuit signal line includes a pair of differential signal lines 201, which are twisted together with a signal reference ground line 202 to form a twisted signal line. Furthermore, the twisted signal line in this invention also includes a signal shielding layer 203, located on the outside of the twisted signal line to simultaneously wrap the circuit signal line and the signal reference ground line. The signal shielding layer 203 can be made of insulating material to shield external interference signals.

[0027] Please continue to refer to this. Figure 2 ,exist Figure 2 In this signal transmission cable, multiple twisted signal lines may be included simultaneously. These twisted signal lines may include multiple twisted-pair signal lines, multiple twisted-triple signal lines, or both twisted-pair and twisted-triple signal lines. Each twisted signal line is wrapped with its corresponding signal shielding layer. The signal transmission cable also includes cable filler 204, which is used to space the multiple twisted signal lines. In some embodiments, the cable filler may be a number of discretely arranged fibers. The cable filler 204 can ensure the integrity of the entire signal transmission cable and protect the twisted signal lines inside the cable from damage when the signal transmission cable is subjected to tension along its extension direction.

[0028] Please continue to refer to this. Figure 2 In this invention, the signal transmission cable also includes a tightly wound shielding layer 205, which is located on the outermost side of the signal transmission cable and is used to wrap around the multiple twisted signal wires in the signal transmission cable. The tightly wound shielding layer 205 further protects the signal transmission cable from interference from external electromagnetic signals and from affecting the signal transmission of external electronic devices. In some embodiments, the tightly wound shielding layer 205 can be made of metal; and the tightly wound shielding layer 205 usually needs to be grounded to ensure its shielding effect. Specifically, multiple twisted signal wires can be wrapped with a dense metal braided mesh to form a complete signal transmission cable that can shield external electromagnetic signals; and the metal braided mesh needs to be grounded.

[0029] In some embodiments, cable connectors are provided at both ends of the signal transmission cable, and a shielding shell is formed on the outside of the cable connector to protect the cable connector; the two ends of the tightly wound shielding layer 205 are respectively welded to the shielding shells at both ends of the signal transmission cable.

[0030] In the above embodiments, the descriptions of each embodiment have different focuses. For parts not described in detail in a certain embodiment, please refer to the relevant descriptions in other embodiments.

[0031] The above description is merely a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A signal transmission cable, characterized in that, The signal transmission cable includes multiple twisted signal wires and a tightly wound shielding layer; The twisted signal line includes a circuit signal line, a signal reference ground line, and a signal shielding layer. The circuit signal line and the signal reference ground line are twisted together at a twist rate of one twist per centimeter. The signal shielding layer is located outside the twisted signal line and is used to wrap the circuit signal line and the signal reference ground line. The tightly wound shielding layer is located on the outside of the signal transmission cable and is used to wrap the twisted signal wire. The tightly wound shielding layer is made of metal material and is grounded.

2. The signal transmission cable according to claim 1, characterized in that, The circuit signal line is a single-ended signal line, and the single-ended signal line and the signal reference ground line are twisted together.

3. The signal transmission cable according to claim 1, characterized in that, The circuit signal line is a pair of differential signal lines, which are twisted together with the signal reference ground line.

4. The signal transmission cable according to claim 1, characterized in that, The signal transmission cable also includes cable filler material, which is used to space the plurality of twisted signal lines.

5. The signal transmission cable according to claim 4, characterized in that, The cable filler consists of several discretely arranged strands of fiber.

6. The signal transmission cable according to claim 1, characterized in that, The signal transmission cable is provided with cable connectors at both ends, and a shielding shell is formed on the outside of the cable connector to protect the cable connector. The two ends of the tightly wound shielding layer are respectively welded to the shielding shells at both ends of the signal transmission cable.

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