CN219248163U

CN219248163U - Differential pair line of PCB board

Info

Publication number: CN219248163U
Application number: CN202223122879.6U
Authority: CN
Inventors: 舒礼铭; 王灿钟
Original assignee: Zhuhai Yibo Technology Co ltd
Current assignee: Zhuhai Yibo Technology Co ltd
Priority date: 2022-11-23
Filing date: 2022-11-23
Publication date: 2023-06-23
Anticipated expiration: 2032-11-23

Abstract

The utility model discloses a differential pair line of a PCB (printed circuit board) in the technical field of PCB design, which comprises the PCB, wherein at least one pair of differential pair lines are arranged on the PCB, each differential pair line comprises an inner differential pair line and a heterodyne pair line, and the corners of the inner differential pair line are provided with inward bulges. The method solves the problems that the existing differential pair line is asynchronous in phase at the corner of the wiring, large in common mode noise and distorted in signal, and the adjacent compensation of the line length is carried out at the corner of the line length difference generated by two differential pair lines, so that the real-time equal length of the differential pair line is ensured, the equivalent inverse of the differential pair line is enabled, the phase difference is reduced, the high synchronization of the phase is ensured, the common mode noise of the differential pair line is reduced, the distortion generated by the signal received by a receiving end is avoided, the phase synchronization of the differential signal in the two transmission lines is ensured well, and the integrity of the signal is maintained.

Description

Differential pair line of PCB board

Technical Field

The utility model relates to the technical field of PCB design, in particular to a differential pair line of a PCB.

Background

Differential transmission is a signal transmission technology, and is different from the conventional method of transmitting signals on two signal wires and one ground wire. The differential pair line uses two wires to transmit a signal, the information carried on the two wires is the same, but the phase difference of the signals is 180 degrees, so that fields generated by the two wires exactly cancel each other, and the radiation is reduced. Meanwhile, as the final signal takes the difference between the two signals, when the two signals are interfered by common mode signals, the noise generated by the two wires is almost the same, and the noise is exactly counteracted when the difference is made at the receiving end.

On a PCB, the differential pair line must be in an equivalent reverse direction, if the differential pair line cannot be in the equivalent reverse direction, signals received by a receiving end will be distorted, if the amplitude of the distortion is too large, the problems that the signals cannot be normally received by the receiving end and the like may occur, so that the circuit function cannot be normally realized. Therefore, to minimize the relative delay between the two single-ended signals of the differential pair, equal-length routing of the differential pair is accurately achieved when the PCB is routed.

The existing winding method of the differential pair line on the PCB board is to perform line length compensation at the tail end of the differential pair line, namely, perform winding compensation at the tail end of the inner differential pair line, so that the line lengths of the two differential pair lines are matched, and the wiring line lengths of the two differential pair lines are equal. However, in the conventional differential pair line, the length of the differential pair line at the inner side is obviously shorter than that of the differential pair line at the outer side at the corner of the line, the line length difference at the corner can be accumulated, the phases of the two differential pair lines at the corner are not synchronous, the common mode noise is large, and signals can be distorted.

Disclosure of Invention

In order to solve the problems that the phase is not synchronous, common mode noise is large, and signals are distorted at the corners of the wiring of the existing differential pair line, the utility model provides the differential pair line of the PCB.

The technical scheme of the utility model is as follows:

the differential pair line of the PCB comprises the PCB, at least one pair of differential pair lines are arranged on the PCB, each differential pair line comprises an inner differential pair line and a heterodyne pair line, and the inner differential pair line is provided with inward bulges at corners.

Further, the bulge comprises a first inflection point, a second inflection point and a third inflection point, and the first inflection point, the second inflection point and the third inflection point are all arc-shaped.

Further, central angles corresponding to the first inflection point, the second inflection point and the third inflection point are 90-135 degrees.

Further, the inner differential line and the heterodyne line have the same routing paths, and the inner differential line and the heterodyne line have the same spacing except at the corners.

Further, the heterodyne line is routed 45 ° at the corner.

Further, the heterodyne line is arcuate at the corner.

Further, the inner and heterodyne lines are straight except at the corners.

Further, the ends of the inner differential line and the heterodyne line are on the same horizontal line.

The utility model according to the scheme has the beneficial effects that: at the corners of the differential pair line, the inner differential line is provided with inward bulges, namely, at the corners of the two differential lines where the line length difference is generated, the nearby compensation of the line length is carried out, the real-time equal length of the differential pair line is ensured, the equivalent of the differential pair line is reversed, the phase difference is reduced, the high synchronization of the phase is ensured, and the common mode noise of the differential pair line is reduced. The signal received by the receiving end is prevented from being distorted, the phase synchronization of differential signals in two transmission lines can be well ensured, and the signal integrity is maintained.

Drawings

FIG. 1 is a schematic diagram of an example application of the present utility model;

FIG. 2 is a partial schematic view of an embodiment of the present utility model;

fig. 3 is a graph of a line length difference for a pair of differential traces.

In the figure, 1, a PCB board; 21. an inner differential line; 22. heterodyne branching; 31. a first inflection point; 32. a second inflection point; 33. and a third inflection point.

Detailed Description

In order to make the technical problems, technical schemes and beneficial effects to be solved more clear, the utility model 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 for purposes of illustration only and are not intended to limit the scope of the utility model.

It should be noted that, the directions or positions indicated by the terms "inner", "outer", etc. are directions or positions based on the directions or positions shown in the drawings, and are only for convenience of description, and are not to be construed as limiting the present technical solution. The terms "first," "second," and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features.

As shown in fig. 1 to 3, the present utility model provides a differential pair of PCB boards 1, including a PCB board 1, at least one pair of differential pair lines are provided on the PCB board 1, the differential pair line includes an inner differential line 21 and a heterodyne line 22, and the inner differential line 21 is provided with an inward protrusion at a corner.

In this embodiment, an inward protrusion is provided at a corner where a line length difference occurs between two differential lines, so as to perform near compensation of the line length, and eliminate line length inconsistency caused by the corner between two parallel differential lines. The real-time equal length of the differential pair line is ensured, so that the equal length errors in the pair are met no matter where the two signals of the differential pair line are, the equal-value reverse of the differential pair line is realized, the phase difference is reduced, the high synchronization of the phase is ensured, and the common mode noise of the differential pair line is reduced. The signal received by the receiving end is prevented from being distorted, the phase synchronization of differential signals in two transmission lines can be well ensured, and the signal integrity is maintained.

As shown in fig. 3, at the corner of the differential pair line, the inner differential pair line 21 is provided with inward protrusions to perform near compensation, and the line length difference between the inner differential pair line 21 and the heterodyne pair line 22 is kept near the error of 0mm, so as to ensure the high synchronization of the phases.

In this embodiment, the mountain-shaped protrusion includes a first inflection point 31, a second inflection point 32, and a third inflection point 33, where the first inflection point 31, the second inflection point 32, and the third inflection point 33 are all arc-shaped, and the corresponding central angles are all 90 ° to 135 °, so that the appropriate central angles corresponding to the first inflection point 31, the second inflection point 32, and the third inflection point 33 can be selected according to actual needs. Preferably, the central angles corresponding to the first inflection point 31, the second inflection point 32 and the third inflection point 33 are all 90 degrees.

In this embodiment, the widths of the wires of the inner differential line 21 and the heterodyne line 22 are determined by the impedance of the differential pair, the wires of the inner differential line 21 and the heterodyne line 22 except for the corners are all straight lines, which is beneficial to synchronous transmission of signals, the wires of the inner differential line 21 and the heterodyne line 22 are identical in path, the distances of the inner differential line 21 and the heterodyne line 22 except for the corners are identical, the distance is determined by the impedance of the differential pair, equal length errors of the two signals of the differential pair in whichever position is satisfied, and phase synchronization of the differential signals in the two transmission lines is ensured.

As shown in fig. 2, heterodyne 22 is routed at the corner at 45 ° and the corner is rounded to facilitate propagation of the differential signal.

It will be understood that modifications and variations will be apparent to those skilled in the art from the foregoing description, and it is intended that all such modifications and variations be included within the scope of the following claims.

While the utility model has been described above with reference to the accompanying drawings, it will be apparent that the implementation of the utility model is not limited by the above manner, and it is within the scope of the utility model to apply the inventive concept and technical solution to other situations as long as various improvements made by the inventive concept and technical solution are adopted, or without any improvement.

Claims

1. The utility model provides a differential pair line of PCB board, includes the PCB board, be equipped with at least a pair of differential pair line on the PCB board, differential pair line includes interior differential line and heterodyne line, its characterized in that, interior differential line is equipped with inward arch in the corner.

2. The differential pair of PCBs of claim 1, wherein the bump comprises a first inflection point, a second inflection point, and a third inflection point, and wherein the first inflection point, the second inflection point, and the third inflection point are each arc-shaped.

3. The differential pair of PCBs according to claim 2, wherein central angles corresponding to the first inflection point, the second inflection point, and the third inflection point are all 90 ° to 135 °.

4. The differential pair of PCBs of claim 1, wherein the inner differential line and the heterodyne line have identical routing paths, and wherein the inner differential line and the heterodyne line have equal spacing except at the corners.

5. The differential pair of PCBs of claim 1, wherein the heterodyne line is routed 45 ° at the corner.

6. The differential pair of PCBs of claim 1, wherein the heterodyne line is arcuate at the corner.

7. The differential pair of PCBs of claim 1, wherein the inner differential line and the heterodyne line are both straight except at the corners.

8. The differential pair of PCBs of claim 1, wherein the inner differential line and the heterodyne line are terminated on a same horizontal line.