CN213715352U

CN213715352U - A fixture for verifying that high-speed serdes eye diagrams are affected by ground plane cross-splitting

Info

Publication number: CN213715352U
Application number: CN202022931855.XU
Authority: CN
Inventors: 陈晨
Original assignee: Taicang T&W Electronics Co Ltd
Current assignee: Taicang T&W Electronics Co Ltd
Priority date: 2020-12-09
Filing date: 2020-12-09
Publication date: 2021-07-16
Anticipated expiration: 2030-12-09

Abstract

The utility model discloses a fixture for verifying that a high-speed serdes eye diagram is affected by a ground plane cross-segmentation, comprising a PCB board. The PCB board is provided with a first ground plane, a second ground plane and a third ground plane on which copper is laid at intervals. A first input end and a second input end are arranged on the first ground plane, a first output end and a second output end are arranged on the second ground plane, and the first input end is connected with the first output end through a first connection line, The second input terminal is connected to the second output terminal through a second connection line, the third ground plane is provided with a third input terminal, a fourth input terminal, a third output terminal and a fourth output terminal, and the third input terminal is connected through a third The line is connected to the third output end, the fourth input end is connected to the fourth output end through a fourth connection line, and the lengths of the first connection line, the second connection line, the third connection line and the fourth connection line are the same. Able to verify that the serdes signal is affected by the ground plane cross-split, and to verify that there is a difference between the full ground plane and the cross split ground plane, this solution is inexpensive.

Description

Clamp for verifying influence of ground level span segmentation on high-speed serdes eye pattern

Technical Field

The utility model relates to the field of communication technology, especially, relate to a verify that high-speed serdes eye diagram is striden by the horizon and cuts apart anchor clamps of influence for whether can open the eye diagram under the influence of the stride of high-speed serdes eye diagram is verified by the horizon, and verify that serdes signal can normally work, whether mainly used research and development stage verifies high-speed serdes signal eye diagram and function can normally work.

Background

In order to ensure that the eye diagram and the function of the high-speed serdes signals can work normally, eye diagram testing and function verification are required, sometimes the eye diagram testing and the function verification are limited by a PCB wiring space, the arrangement of serdes signal wires is difficult, and a signal reference ground plane is also possibly suspended.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to above-mentioned prior art not enough, provide one kind and verify that high-speed serdes eye diagram is striden by the horizon and cuts apart the anchor clamps of influence, have complete horizon and have the horizon of cutting apart under through the simulation, obtain the result of serdes signal eye diagram, just can verify through this kind of mode that the serdes signal can normally work the condition.

In order to solve the above problems, the utility model adopts the following technical proposal:

the fixture comprises a PCB, wherein a first ground plane, a second ground plane and a third ground plane are arranged on the PCB at intervals, copper is laid on the first ground plane, the second ground plane and the third ground plane, a first input end and a second input end are arranged on the first ground plane, a first output end and a second output end are arranged on the second ground plane, the first input end is connected with the first output end through a first connecting wire, the second input end is connected with the second output end through a second connecting wire, one end of the third ground plane is provided with a third input end and a fourth input end, the other end of the third ground plane is provided with a third output end and a fourth output end, the third input end is connected with the third output end through a third connecting wire, the fourth input end is connected with the fourth output end through a fourth connecting wire, and the first connecting wire is connected with the fourth output end through a third connecting wire, The second connecting line, the third connecting line and the fourth connecting line are the same in length.

A further technical scheme is that the first input end, the second input end, the third input end, the fourth input end, the first output end, the second output end, the third output end and the fourth output end are all 3.5mm SMA female head seats.

Adopt the produced beneficial effect of above-mentioned technical scheme to lie in: the method is easy to realize, can verify that serdes signals are influenced by ground plane cross segmentation, and verifies that the difference between a complete ground plane and a cross-segmented ground plane exists, and the scheme is low in cost and has high cost performance.

Drawings

Fig. 1 is a schematic diagram of the present invention.

In the figure: 1. a PCB board; 2. a first ground plane; 3. a second ground plane; 4. a third ground plane; 5. a first input terminal; 6. a second input terminal; 7. a first output terminal; 8. a second output terminal; 9. a third input terminal; 10. a fourth input terminal; 11. a third output terminal; 12. a fourth output terminal; 13. a first connecting line; 14. a second connecting line; 15. a third connecting line; 16. and a fourth connecting line.

Detailed Description

The following describes embodiments of the present invention in further detail with reference to the accompanying drawings and examples. The following examples are intended to illustrate the invention, but are not intended to limit the scope of the invention.

As shown in FIG. 1, a fixture for verifying that a high-speed serdes eye diagram is affected by ground level crossing and dividing is used for verifying whether the high-speed serdes eye diagram can be opened under the influence of the ground level crossing and dividing and verifying whether serdes signals can work normally, the fixture comprises a PCB (printed Circuit Board) 1, wherein a first ground plane 2, a second ground plane 3 and a third ground plane 4 are arranged on the PCB 1 at intervals, copper is coated on the first ground plane 2, the second ground plane 3 and the third ground plane 4, a first input end 5 and a second input end 6 are arranged on the first ground plane 2, a first output end 7 and a second output end 8 are arranged on the second ground plane 3, the first input end 5 is connected with the first output end 7 through a first connecting wire 13, the second input end 6 is connected with the second output end 8 through a second connecting wire 14, a third input end 9 and a fourth input end 10 are arranged at one end of the third ground plane 4, the other end is equipped with third output 11 and fourth output 12, third input 9 is connected with third output 11 through third connecting wire 15, fourth input 10 is connected with fourth output 12 through fourth connecting wire 16, first connecting wire 13, second connecting wire 14, third connecting wire 15 and fourth connecting wire 16 length are the same.

The first input end 5, the second input end 6, the third input end 9, the fourth input end 10, the first output end 7, the second output end 8, the third output end 11 and the fourth output end 12 are all 3.5mm SMA female head seats.

The working principle is as follows: 1. serdes is a differential signal, TX + and TX-, respectively, provided as an input source by the Serdes signal of the optical interface of the high speed switch to the first input terminal 5, the second input terminal 6 or the third input terminal 9 and the fourth input terminal 10 of the clamp. 2. The ground planes are divided into two types, the upper half part of the clamp is provided with two ground planes, the middle part of the clamp is not coated with copper, and the transmission line passes through the part without the ground plane after passing through the first ground plane part from the signal input end and finally is sent out to the output end through the part with the ground plane. The lower half part of the clamp is a whole ground plane, and the transmission line is directly sent to the output end from the input end through the complete ground plane.

When the clamp is used for verification, the condition that the serdes signals are subjected to ground plane span division is verified, a high-speed serdes signal source is input to a first input end 5 and a second input end 6, namely the upper half part of the clamp, the serdes signals pass through the ground plane with span division at the moment, the output serdes signals are connected to an oscilloscope through a first output end 7 and a second output end 8 to check the eye pattern state of the serdes, the eye pattern is in a closed state at the moment, the function is verified again, the serdes signals cannot normally work under the ground plane span division condition, and the condition that the influence of the ground plane span division on the high-speed serdes signals is serious and the serdes signals cannot work can be caused can be obtained. And then, under the condition that the serdes signals are not subjected to ground plane span division, inputting the high-speed serdes signal source to a third input end 9 and a fourth input end 10, namely the lower half part of the clamp, wherein the serdes signals pass through a complete ground plane, connecting the output serdes signals to an oscilloscope through a third output end 11 and a fourth output end 12 to check the eye diagram state of the serdes signals, and at the moment, the eye diagram is in an open state, verifying the function again, so that the serdes signals can normally work under the condition that the ground plane is complete, the function is normal, and the fact that the complete ground plane has much importance on the high-speed serdes signals is explained. The scheme is simple to realize, the cost is saved, the cost of the clamp plate is only dozens of money, and the operation is convenient.

Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it should be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; such modifications and substitutions do not depart from the spirit and scope of the embodiments of the present invention.

Claims

1. A fixture for verifying that a high speed serdes eye diagram is affected by ground plane cross-segmentation, comprising: comprises a PCB (1), wherein a first ground plane (2), a second ground plane (3) and a third ground plane (4) are arranged on the PCB (1) at intervals, copper is laid on the first ground plane (2), the second ground plane (3) and the third ground plane (4), a first input end (5) and a second input end (6) are arranged on the first ground plane (2), a first output end (7) and a second output end (8) are arranged on the second ground plane (3), the first input end (5) is connected with the first output end (7) through a first connecting line (13), the second input end (6) is connected with the second output end (8) through a second connecting line (14), one end of the third ground plane (4) is provided with a third input end (9) and a fourth input end (10), and the other end is provided with a third output end (11) and a fourth output end (12), the third input end (9) is connected with the third output end (11) through a third connecting line (15), the fourth input end (10) is connected with the fourth output end (12) through a fourth connecting line (16), and the first connecting line (13), the second connecting line (14), the third connecting line (15) and the fourth connecting line (16) are the same in length.

2. The fixture of claim 1, wherein the fixture is configured to verify that a high speed serdes eye diagram is affected by ground plane cross-segmentation, and wherein: the first input end (5), the second input end (6), the third input end (9), the fourth input end (10), the first output end (7), the second output end (8), the third output end (11) and the fourth output end (12) are all 3.5mm SMA female head seats.