CN205755038U - A kind of PCB reducing the interference of VGA water ripples - Google Patents
A kind of PCB reducing the interference of VGA water ripples Download PDFInfo
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- CN205755038U CN205755038U CN201620509921.5U CN201620509921U CN205755038U CN 205755038 U CN205755038 U CN 205755038U CN 201620509921 U CN201620509921 U CN 201620509921U CN 205755038 U CN205755038 U CN 205755038U
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- vga
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- filter capacitor
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Abstract
This utility model relates to a kind of PCB reducing the interference of VGA water ripples, including a VGA grounded circuit, described VGA grounded circuit is arranged in a PCB, and the RGB earth-return circuit in described VGA grounded circuit uses Keep out to separate with the DGND signal of surrounding circuit at TOP layer；The earth signal of described RGB earth-return circuit is not connected with the end over the ground of 5V filter capacitor, the end over the ground of described 5V filter capacitor uses Keep out to separate, and in described PCB, the end over the ground of 5V filter capacitor offers one or two through holes to BOT layer, in order to make the ripple noise of 5V filter capacitor be dissipated to BOT layer ground by through hole.This utility model can improve EMI, reduces water ripples interference.
Description
Technical field
This utility model relates to the PCB circuit design field about VGA ground connection of the display product of band USB interface, especially
It it is a kind of PCB reducing the interference of VGA water ripples.
Background technology
In the layout design of the PCB of the VGA ground connection showing product of all band USB interface, Fig. 1 is VGA
Ground path figure, as in figure 2 it is shown, the Layout method of current VGA RGB ground path is: the earth signal DGND warp of VGA RGB
Cross 5V filtered electrical (C119/C117/C118) and BAV99 (D104/D102/D103), do not get through hole, DGND direct single line Trace
It is connected.Keep out(diamond-plaid) the three piece single line DGNDs of VGA are completely covered, forbid spreading copper to this region.After accessing signal,
Because of the change of load, the Ripple of 5V can be caused to strengthen, 5V filter capacitor (C119/C117/C118) DGND end and R/G/B
DGND signal is joined directly together, and filter capacitor DGND end is not got through hole and is connected with the earth of lower plate, therefore ripple noise cannot dissipate
To the earth, filtered it is capacitively coupled to R/G/B DGND, IC can be sealed in and cause water ripples.The most single-ended DGND cabling is not tried one's best
Slightly, it is unfavorable for EMI.
Summary of the invention
In view of this, the purpose of this utility model is to provide a kind of PCB reducing the interference of VGA water ripples, it is possible to
Improve EMI, reduce water ripples interference.
This utility model uses below scheme to realize: a kind of PCB reducing the interference of VGA water ripples, including a VGA
Grounded circuit, described VGA grounded circuit is arranged in a PCB, and the RGB earth-return circuit in described VGA grounded circuit exists
TOP layer uses Keep out to separate with the DGND signal of surrounding circuit；The earth signal of described RGB earth-return circuit not with 5V filtered electrical
The end over the ground held is connected, and the end over the ground of described 5V filter capacitor uses Keep out to separate, and 5V filtering in described PCB
The end over the ground of electric capacity offers one or two through holes to BOT layer, in order to make the ripple noise of 5V filter capacitor be dissipated to by through hole
Ground.
In this utility model, this PCB with Keep out by the ground of loop surrounding and the system on VGA RGB ground every
Opening, after paving copper, the DGND of RGB can try one's best wide and thick, beneficially EMI, and the ground of RGB with externally separate, be not subject to externally
Interference.It addition, the end over the ground of the earth signal bypass 5V filter capacitor of VGA RGB, and use is held in 5V filtering over the ground
Keepout separates, and gets through hole to BOT layer, makes the ripple noise of 5V be dissipated to the earth by via, it is to avoid ripple crosstalk enters
IC causes water ripples.
Accompanying drawing explanation
Fig. 1 is the schematic diagram of VGA grounded circuit.
Fig. 2 is the pcb board schematic diagram of prior art.
Fig. 3 is pcb board schematic diagram of the present utility model.
Detailed description of the invention
Below in conjunction with the accompanying drawings and this utility model is described further by embodiment.
The present embodiment provides a kind of PCB reducing the interference of VGA water ripples, as it is shown on figure 3, include a VGA ground connection
Circuit, described VGA grounded circuit is arranged in a PCB, and the RGB earth-return circuit in described VGA grounded circuit uses
Keep out separates with the DGND signal of surrounding circuit；The earth signal of described RGB earth-return circuit is with 5V filter capacitor not over the ground
End is connected, and the end over the ground of described 5V filter capacitor uses Keepout to separate, and 5V filter capacitor right in described PCB
Ground end offers one or two through holes to BOT layer, in order to make the ripple noise of 5V filter capacitor be dissipated to ground by through hole.
In the present embodiment, in Fig. 2 and Fig. 3, diamond-plaid is Keep out, in order to stop paving copper to its overlay area, separately
Outward, the element number of Fig. 3 is with reference to the element number of Fig. 2.
In the present embodiment, this PCB with Keep out by the ground of loop surrounding and the system on VGA RGB ground every
Opening, can make the ground of RGB and externally separate, by interference externally, and single line ground can also try one's best slightly, beneficially EMI.
It addition, the end over the ground of the earth signal bypass 5V filter capacitor of VGA RGB, and 5V filtering held over the ground separate with Keep out,
And get through hole to BOT layer, make the ripple noise of 5V be dissipated to the earth by through hole, it is to avoid ripple crosstalk enters IC and causes ripples
Stricture of vagina.
The foregoing is only preferred embodiment of the present utility model, all according to this utility model claim done equal
Deng change and modification, covering scope of the present utility model all should be belonged to.
Claims (3)
1. reduce a PCB for VGA water ripples interference, including a VGA grounded circuit, it is characterised in that: described VGA connects
Ground circuit be arranged in a PCB, the RGB earth-return circuit in described VGA grounded circuit TOP layer use Keep out with
The DGND signal of surrounding circuit separates；The earth signal of described RGB earth-return circuit is not connected with the end over the ground of 5V filter capacitor, described
The end over the ground of 5V filter capacitor uses Keep out to separate, and in described PCB, the end over the ground of 5V filter capacitor is offered logical
Hole is to BOT layer, in order to make the ripple noise of 5V filter capacitor be dissipated to ground by through hole.
A kind of PCB reducing the interference of VGA water ripples the most according to claim 1, it is characterised in that: described through hole
Quantity be one.
A kind of PCB reducing the interference of VGA water ripples the most according to claim 1, it is characterised in that: described through hole
Quantity be two.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620509921.5U CN205755038U (en) | 2016-05-31 | 2016-05-31 | A kind of PCB reducing the interference of VGA water ripples |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620509921.5U CN205755038U (en) | 2016-05-31 | 2016-05-31 | A kind of PCB reducing the interference of VGA water ripples |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN205755038U true CN205755038U (en) | 2016-11-30 |
Family
ID=57363147
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201620509921.5U Active CN205755038U (en) | 2016-05-31 | 2016-05-31 | A kind of PCB reducing the interference of VGA water ripples |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN205755038U (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109542819A (en) * | 2018-11-26 | 2019-03-29 | 郑州云海信息技术有限公司 | A kind of preposition I/O port of server and the implementation method for improving EMC performance |
| CN109862296A (en) * | 2019-01-23 | 2019-06-07 | 西安微电子技术研究所 | A kind of elimination VGA display interface water ripples circuit and its working method |
| CN112739052A (en) * | 2020-12-02 | 2021-04-30 | 上海伟世通汽车电子系统有限公司 | PCB crystal oscillator wiring method |
-
2016
- 2016-05-31 CN CN201620509921.5U patent/CN205755038U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109542819A (en) * | 2018-11-26 | 2019-03-29 | 郑州云海信息技术有限公司 | A kind of preposition I/O port of server and the implementation method for improving EMC performance |
| CN109862296A (en) * | 2019-01-23 | 2019-06-07 | 西安微电子技术研究所 | A kind of elimination VGA display interface water ripples circuit and its working method |
| CN112739052A (en) * | 2020-12-02 | 2021-04-30 | 上海伟世通汽车电子系统有限公司 | PCB crystal oscillator wiring method |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CP03 | Change of name, title or address | ||
| CP03 | Change of name, title or address |
Address after: 350300 Fuqing City, Fuzhou, Fujian, the reunification of overseas Chinese economic and Technological Development Zone Patentee after: TPV Electronic Technology (Fujian) Co.,Ltd. Address before: 350301 Fujian JIELIAN Electronics Co., Ltd Patentee before: TPV Electronics(Fujian)Co.,Ltd. |