Structure for shortening branch circuit stub line and circuit board

Abstract

The utility model discloses a structure for shortening a branch circuit stub line and a circuit board, the structure comprises a control chip, a main connector and secondary connectors, a main line is connected between the control chip and the main connector, branch lines are connected between the main connector and the secondary connectors and between the secondary connectors, and the branch lines are connected between the main connector and the secondary connectors. The branch wires are detachably connected with electrical connecting pieces, and the electrical connecting pieces are detached to disconnect the corresponding branch wires, so that the stub wire is shortened. According to the utility model, the detachable electric connecting piece is arranged, so that the system can quickly adjust the connecting state according to actual requirements, and the design flexibility is improved. And when the secondary connector is not needed, branch wiring connection is disconnected, so that the length of a stub line is effectively shortened, signal reflection is reduced, and signal integrity and stability are improved.

Description

Technical Field

[0001] The utility model relates to the technical field of stub lines, and more particularly to a structure for shortening a stub line of a branch circuit and a circuit board. Background Art

[0002] During the circuit design process, when the chip U1 signal is branching, such as Figure 1 As shown, signals are connected to both connectors J1 and J2. However, the two connected devices are sometimes not used simultaneously; only one of them is used. Chip U1's signals are connected to both connectors J1 and J2, and chip U1 is connected to connector J2 via connector J1. When only connector J1 is used, a long stub cable exists between connectors J1 and J2. This cable significantly impacts signal quality on the circuit board. Excessive stub cable can severely impact signal quality on the circuit board. The stub cable acts as an antenna, radiating and receiving electromagnetic interference (EMI), which in turn interferes with adjacent signal lines and impacts signal integrity. Furthermore, the stub cable causes signal reflections. When the reflected signal is superimposed on the original signal, it distorts the signal waveform, degrading signal quality and even preventing it from being correctly recognized and processed. For high-speed signals, this can cause the entire system to malfunction, or even render the circuit board useless.

[0003] The above shortcomings need to be improved. Summary of the Invention

[0004] In order to solve or alleviate the problem that branch wiring in a circuit has long stubs when not in use, which affects signal quality, the utility model provides a structure and a circuit board for shortening the stubs of the branch circuit.

[0005] The technical solution of this utility model is as follows:

[0006] A structure for shortening a branch circuit stub line comprises a control chip, a main connector, and a secondary connector. A trunk line is connected between the control chip and the main connector. Branch lines are connected between the main connector and the secondary connector, and between the secondary connectors. Electrical connectors are detachably connected to the branch lines. Removing the electrical connectors disconnects the corresponding branch lines, thereby shortening the stub lines.

[0007] In the above-mentioned structure for shortening the stub line of the branch circuit, a soldering pad is provided at the interruption of the branch line, and the electrical connector is soldered to the soldering pad to connect the branch line.

[0008] Furthermore, the pad is a surface mount pad.

[0009] In the aforementioned structure for shortening a branch circuit stub line, the electrical connector is a 0-ohm resistor.

[0010] Furthermore, the actual resistance R of the 0-ohm resistor is in the range of: R≤10mΩ, 10mΩ<R≤20mΩ or 20mΩ<R≤50mΩ.

[0011] Furthermore, the packaging specifications of the 0-ohm resistor include 0201, 0402, 0603, 0805, 1206, 1210, 1812, 2010 or 2512.

[0012] In the above-mentioned structure for shortening the stub line of a branch circuit, the discontinuity of the branch line is arranged close to the lead-out end.

[0013] Furthermore, the electrical connector and the main connector or the secondary connector are arranged on the same surface, and the electrical connector is located outside the main connector or the secondary connector arrangement area and close to the corresponding main connector or the secondary connector.

[0014] Furthermore, the electrical connector and the main connector or the secondary connector are arranged on different surfaces, and the electrical connector is located at the bottom of the main connector or the secondary connector arrangement area.

[0015] On the other hand, a circuit board is characterized by including the structure for shortening the branch circuit stub line.

[0016] The present invention according to the above solution has the beneficial effect that, by providing a detachable electrical connector, the system can quickly adjust the connection state according to actual needs, thereby improving design flexibility. Disconnecting the branch line connection when the secondary connector is not needed effectively shortens the stub line length, reduces signal reflections, and improves signal integrity and stability. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0018] Figure 1 It is a structural diagram of the prior art;

[0019] Figure 2 It is a structural diagram of the present utility model.

[0020] Among them, the reference numerals in the figure are: 1. control chip; 2. main connector; 3. secondary connector; 4. trunk line; 5. branch line; 6. electrical connector; 7. solder pad; 8. circuit board. DETAILED DESCRIPTION

[0021] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present invention more clearly understood, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0022] It should be noted that when a component is referred to as being "fixed" or "set" or "connected" to another component, it may be located directly or indirectly on the other component. The directions or positions indicated by the terms "upper", "lower", "left", "right", "front", "back", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc. are based on the directions or positions shown in the accompanying drawings and are only for the convenience of description and cannot be understood as limitations on this technical solution. The terms "first", "second", etc. are only used for the convenience of description and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features. "Multiple" means two or more, unless otherwise clearly and specifically defined. "Several" means one or more, unless otherwise clearly and specifically defined.

[0023] like Figure 2 As shown, a structure for shortening a branch circuit stub line described in one embodiment of the utility model includes a control chip 1, a main connector 2, and a secondary connector 3. A trunk line 4 is connected between the control chip 1 and the main connector 2, and branch lines 5 are connected between the main connector 2 and the secondary connector 3 and between the secondary connectors 3. An electrical connector 6 is detachably connected to the branch line 5. Removing the electrical connector 6 disconnects the corresponding branch line 5, thereby shortening the stub line.

[0024] When secondary connector 3 is needed, electrical connector 6 is installed, connecting the two sections of branch trace 5. Control chip 1 generates a signal and transmits it to primary connector 2 via trunk trace 4. After primary connector 2 receives the signal, it transmits it to secondary connector 3 via branch trace 5. Secondary connector 3 then transmits the received signal to other connected devices or circuits.

[0025] When secondary connector 3 is not in use, electrical connector 6 is removed, disconnecting branch trace 5. Control chip 1 generates a signal and transmits it to primary connector 2 via trunk trace 4. At this point, the signal is transmitted only from trunk trace 4 to primary connector 2 and not via branch trace 5 to secondary connector 3. Disconnecting branch trace 5 shortens the stub, minimizing its impact on signal quality.

[0026] In this embodiment, by providing a detachable electrical connector 6, the system can quickly adjust the connection state according to actual needs, improving design flexibility. When the secondary connector 3 is not needed, the branch line 5 can be disconnected, effectively shortening the stub length, reducing signal reflections, and improving signal integrity and stability.

[0027] like Figure 2 As shown, in a preferred embodiment, a soldering pad 7 is provided at a discontinuity of the branch line 5 , and the electrical connector 6 is welded to the soldering pad 7 to connect the branch line 5 .

[0028] Specifically, the pad 7 is a surface mount pad.

[0029] In this embodiment, the electrical connector 6 is fixed to the pad 7 by welding, which ensures that the two sections of the branch line 5 form a stable mechanical and electrical connection, can withstand external environmental factors such as vibration and impact, and reduce the risk of loosening or falling off the connection. The welding connection makes the connection between the electrical connector 6 and the pad 7 low-resistance and low-inductance, reducing signal loss and interference during transmission. It is particularly suitable for high-speed signal transmission and ensures that the signal maintains a stable waveform and amplitude when transmitted on the branch line 5. In addition, the welding connection can be disassembled and re-welded using welding tools when the electrical connector 6 needs to be replaced or repaired.

[0030] The surface mount pads make the soldering operation during the manufacturing process of the circuit board 8 easier. The surface mount pads are located on the surface of the circuit board 8, which facilitates the soldering operation of automated soldering equipment (such as SMT production lines), thereby improving production efficiency and reducing manufacturing costs.

[0031] In a preferred embodiment, the electrical connection element 6 is a 0 ohm resistor.

[0032] The actual resistance value R of a 0 ohm resistor ranges from R≤10mΩ, 10mΩ<R≤20mΩ, or 20mΩ<R≤50mΩ.

[0033] The package sizes of 0 ohm resistors include 0201, 0402, 0603, 0805, 1206, 1210, 1812, 2010 or 2512.

[0034] In this embodiment, a 0-ohm resistor is used as the electrical connector 6. In high-frequency or high-speed signal transmission applications, the 0-ohm resistor can serve as an impedance matching element, helping to reduce signal reflections and crosstalk, thereby optimizing signal integrity. A 0-ohm resistor theoretically has a resistance of 0, but in actual production, its resistance may vary slightly due to process and material factors. By selecting 0-ohm resistors with different resistance ranges, the current passing through that point can be controlled, thereby optimizing circuit performance. By selecting the appropriate resistance value, the impedance of the signal transmission line can be adjusted to match the impedance of the receiving end, improving the quality of signal transmission. 0-ohm resistors of different package sizes are selected based on the space requirements and layout requirements of the application scenario. 0-ohm resistors with small package sizes (such as 0201 and 0402) are suitable for applications with limited space, while 0-ohm resistors with large package sizes (such as 2512) are more suitable for applications that need to withstand higher currents. This diverse selection makes circuit design more flexible and efficient.

[0035] like Figure 2 As shown, in a preferred embodiment, the discontinuity of the branch wiring 5 is arranged close to the lead-out end.

[0036] In this embodiment, the interruption of the branch line 5 is close to the lead-out end. If the electrical connector 6 does not need to be connected, the length of the stub line is further reduced. The shorter stub line has less reflection during signal transmission, thereby ensuring the integrity of the signal line, ensuring that the signal can be accurately and quickly transmitted to the target device, and ensuring the performance and response speed of the entire system.

[0037] Specifically, the electrical connector 6 and the main connector 2 or the secondary connector 3 are arranged on the same surface, and the electrical connector 6 is located outside the layout area of ​​the main connector 2 or the secondary connector 3 and close to the corresponding main connector 2 or the secondary connector 3.

[0038] In this embodiment, because the electrical connector 6 is positioned adjacent to the connector, the signal path length from the connector to the electrical connector 6 can be reduced. When the secondary connector 3 is no longer needed, the electrical connector 6 can be removed. This shortens the stub line, reducing signal reflections during transmission and improving signal transmission quality. Furthermore, during assembly, because the electrical connector 6 and the connector are located on the same surface, assembly is facilitated and efficiency is improved.

[0039] Specifically, the electrical connector 6 and the main connector 2 or the secondary connector 3 are arranged on different surfaces, and the electrical connector 6 is located at the bottom of the main connector 2 or the secondary connector 3 arrangement area.

[0040] In this embodiment, the electrical connector 6 is placed under the connector, so that it is not restricted by the position of the connector and can be connected to the connector through a via, further reducing the length of the branch trace 5 between the electrical connector 6 and the corresponding connector (the length of the via), thereby further shortening the residual length and improving the signal quality.

[0041] A circuit board 8 described in an embodiment of the present invention includes the structure for shortening the stub line of the branch circuit.

[0042] In this embodiment, by shortening the length of the stub line of the branch circuit, the reflection, crosstalk and radiation loss of the signal during transmission are reduced, thereby improving the integrity and stability of the signal. Especially for high-speed and high-frequency signal transmission, it can ensure that the signal is transmitted accurately and quickly on the circuit board 8, reduce the bit error rate and distortion, and ensure the performance of the circuit board 8.

[0043] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent replacements and improvements made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A structure for shortening a branch circuit stub line, characterized in that: It includes a control chip, a main connector, and a secondary connector. A trunk line is connected between the control chip and the main connector, and branch lines are connected between the main connector and the secondary connector and between the secondary connectors. The branch lines are detachably connected with electrical connectors. Removing the electrical connectors disconnects the corresponding branch lines, shortening the stub lines.

2. A structure for shortening a branch circuit stub line according to claim 1, characterized in that: A soldering pad is provided at the discontinuity of the branch wiring, and the electrical connector is soldered to the soldering pad to connect with the branch wiring.

3. The structure for shortening a branch circuit stub line according to claim 2, characterized in that: The pad is a surface mount pad.

4. The structure for shortening a branch circuit stub line according to claim 1, characterized in that: The electrical connection element is a 0 ohm resistor.

5. The structure for shortening a branch circuit stub line according to claim 4, characterized in that: The actual resistance value R of the 0-ohm resistor is in the range of: R≤10mΩ, 10mΩ<R≤20mΩ or 20mΩ<R≤50mΩ.

6. The structure for shortening a branch circuit stub line according to claim 4, characterized in that: The packaging specifications of the 0 ohm resistor include 0201, 0402, 0603, 0805, 1206, 1210, 1812, 2010 or 2512.

7. The structure for shortening a branch circuit stub line according to claim 1, characterized in that: The branch wiring discontinuity is arranged close to the lead-out end.

8. The structure for shortening a branch circuit stub line according to claim 7, characterized in that: The electrical connector and the main connector or the secondary connector are arranged on the same surface. The electrical connector is located outside the main connector or the secondary connector arrangement area and is close to the corresponding main connector or the secondary connector.

9. The structure for shortening a branch circuit stub line according to claim 7, characterized in that: The electrical connector and the main connector or the secondary connector are arranged on different surfaces, and the electrical connector is located at the bottom of the main connector or the secondary connector arrangement area.

10. A circuit board, characterized in that: The invention comprises the structure for shortening a branch circuit stub line according to any one of claims 1 to 9.

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