CN209624696U - A kind of printed circuit board - Google Patents
A kind of printed circuit board Download PDFInfo
- Publication number
- CN209624696U CN209624696U CN201822154523.8U CN201822154523U CN209624696U CN 209624696 U CN209624696 U CN 209624696U CN 201822154523 U CN201822154523 U CN 201822154523U CN 209624696 U CN209624696 U CN 209624696U
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- Prior art keywords
- crystal oscillator
- quartz crystal
- ground
- printed circuit
- ground line
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- 239000013078 crystal Substances 0.000 claims abstract description 83
- 239000010453 quartz Substances 0.000 claims abstract description 53
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N silicon dioxide Inorganic materials O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims abstract description 53
- 239000003990 capacitor Substances 0.000 claims abstract description 20
- 230000005611 electricity Effects 0.000 description 4
- 238000010586 diagram Methods 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 230000010355 oscillation Effects 0.000 description 2
- 230000005540 biological transmission Effects 0.000 description 1
- 238000003912 environmental pollution Methods 0.000 description 1
- 230000006870 function Effects 0.000 description 1
- 230000002452 interceptive effect Effects 0.000 description 1
- 230000001681 protective effect Effects 0.000 description 1
- 230000005855 radiation Effects 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 239000004575 stone Substances 0.000 description 1
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- Oscillators With Electromechanical Resonators (AREA)
Abstract
The utility model discloses a kind of printed circuit board, including circuit main board, the circuit main board includes at least quartz crystal oscillator layer；The quartz crystal oscillator layer includes at least quartz crystal oscillator, the capacitor of quartz crystal oscillator input terminal, the capacitor of quartz crystal oscillator output end, the first ground line and the resistance being connected across between the quartz crystal oscillator input terminal and output end；First ground line is the annular of closure, the quartz crystal oscillator, the capacitor of quartz crystal oscillator input terminal and output end, the resistance that is connected across between the quartz crystal oscillator input terminal and output end are located in first ground line, and there is ground hole on first ground line, the ground hole is connected with the ground plane.Printed circuit board provided by the utility model enables printed circuit board by electromagnetic compatibility test, promotes the market competitiveness of printed circuit board.
Description
Technical field
The utility model relates to one of integrated circuit fields more particularly to integrated circuit fields printed circuit boards.
Background technique
Electromagnetic disturbance is a serious and ever-increasing environmental pollution form, its influence as low as broadcast reception when generate
Allow the crack that people is sick of, it is big to life accident caused by being disturbed because of control system.And radiation disturbance is electromagnetic disturbance
In most important interference mode, its direct outside radiated electromagnetic energy in the form of an electromagnetic wave, thus to human body and other equipment
It damages and interferes.
Crystal oscillator is the component often occurred in route, and crystal oscillator, which is divided into, has source crystal oscillator and without source crystal oscillator, no source crystal oscillator, that is, stone
English crystal oscillator, its own can not be vibrated, and need that oscillator signal could be generated by means of clock circuit.There is source crystal oscillator to refer generally to quartz-crystal
Oscillation body device, a usually IC device, inside in addition to quartz crystal, be also integrated with transistor and Resistor-Capacitor Unit collectively constitute it is humorous
Shake circuit.When there is external power supply input, oscillator can work, and export clock signal.
In existing server crystal oscillator design scheme, since crystal oscillator does not carry out good layout designs, often lead to set
Radiation-emitting is exceeded during meter.In the prior art by the plate layer of increase printed circuit board (pcb board), and as far as possible by crystal oscillator
The mode being placed among plank makes the printed circuit board by electromagnetic compatibility test, but this mode will cause plank
Area increases, and increases product whole design cost.
Utility model content
The technical problem to be solved by the present invention is to provide a kind of printed circuit boards, and printed circuit board is enable to pass through electricity
Magnetic compatibility test promotes the market competitiveness of printed circuit board.
To solve the above-mentioned problems, the utility model embodiment provides printed circuit board, comprising:
The circuit main board includes at least quartz crystal oscillator layer；
The quartz crystal oscillator layer includes at least quartz crystal oscillator, the capacitor of quartz crystal oscillator input terminal, quartz crystal oscillator output end
Capacitor, the first ground line and the resistance being connected across between the quartz crystal oscillator input terminal and output end；
It is described first ground line for closure annular, the quartz crystal oscillator, quartz crystal oscillator input terminal and output end capacitor,
It is connected across the resistance between the quartz crystal oscillator input terminal and output end to be located in first ground line, and described first
There is ground hole, the ground hole is connected with the ground plane on ground line.
In a kind of exemplary embodiment, above-mentioned printed circuit board also has the characteristics that following:
The circuit main board further includes ground plane；
The ground plane is located at the lower layer of the quartz crystal oscillator layer, and the ground plane only has the second ground line；
Second ground line is connected by the ground hole with first ground line.
In a kind of exemplary embodiment, above-mentioned printed circuit board also has the characteristics that following:
The width of first ground line is greater than 300 millimeters.
To sum up, printed circuit board provided by the embodiment of the utility model, it is conditional with structure space not increasing plate layer
In the case of, enable printed circuit board by electromagnetic compatibility test, improves the market competitiveness of printed circuit board.
Detailed description of the invention
Fig. 1 is the schematic diagram according to the quartz crystal oscillator on the printed circuit board of the utility model embodiment.
Specific embodiment
For the purpose of this utility model, technical solution and advantage is more clearly understood, below in conjunction with attached drawing to this
The embodiment of utility model is described in detail.It should be noted that in the absence of conflict, embodiment in the application and
Feature in embodiment can mutual any combination.
Fig. 1 is the schematic diagram of the printed circuit board of the utility model embodiment, as shown in Figure 1, the printing electricity of the present embodiment
Road plate includes:
The circuit main board includes at least quartz crystal oscillator layer 10；
The quartz crystal oscillator layer is defeated including at least quartz crystal oscillator 101, capacitor 102, the quartz crystal oscillator of quartz crystal oscillator input terminal
The resistance 106 that the capacitor 103, first of outlet is grounded 104 and is connected across between the quartz crystal oscillator input terminal and output end；
First ground line 104 is the annular of closure, the quartz crystal oscillator 101, quartz crystal oscillator input terminal and output end
Capacitor 102/103, the resistance 106 that is connected across between the quartz crystal oscillator input terminal and output end be located at first ground line
In 104, and there is ground hole 105 on first ground line 104, the ground hole 105 is with the ground plane (in Fig. 1
It is not drawn into) it is connected.
Crystal oscillator in actual use, since structure limits or is limited by mainboard (i.e. circuit main board) size, can go out
The case where existing crystal oscillator must be placed in board edges.But when crystal oscillator is placed in board edges, since crystal oscillator can generate relatively by force
Energy, crystal oscillator energy can be radiate with mainboard edges of boards, and edges of boards are also vulnerable to the influence of interference signal.Therefore, it uses
Input terminal/output end capacitor of crystal oscillator and crystal oscillator is surrounded by ground line, ground line closure.And add on ground line
Ground hole.If crystal oscillator generates electromagnetic interference, interfering energy can be conducting to the ground terminal of mainboard with ground line, pass through master
Plate earthing end absorbs energy, to reduce the electromagnetic interference signal of crystal oscillator entirety.
In a kind of exemplary embodiment, the width of first ground line 104 can be greater than 300 (mil) millimeters.It should
The wider the width of ground line the better.
In a kind of exemplary embodiment, the circuit main board further includes ground plane；
The ground plane can be located at the lower layer of the quartz crystal oscillator layer 10, and the ground plane can only have the second ground connection
Line (is not drawn into) in Fig. 1.
In a kind of exemplary embodiment, second ground line passes through the ground hole 105 and first ground line
104 are connected.
Since quartz crystal oscillator can generate stronger energy, All other routes will receive the influence of crystal oscillator energy, all signals
Line does not allow the lower section by crystal oscillator (i.e. quartz crystal oscillator 101), to prevent crystal oscillator energy interference to the signal wire of lower section.Therefore,
The mode that GND (i.e. above-mentioned ground plane) is spread below crystal oscillator avoids HW High Way high by below crystal oscillator, causing crystal oscillator to influence
The requirement of velocity signal line electromagnetic compatibility and signal integrity.If crystal oscillation signal is crosstalked into above HW High Way, spoke will cause
It penetrates the exceeded and signal integrity of transmitting to go wrong, will cause product when serious cannot be complete by electromagnetic compatibility test and signal
Whole property test.
In a kind of exemplary embodiment, the capacitor of the ground terminal of the quartz crystal oscillator, the quartz crystal oscillator input terminal
The ground terminal of the capacitor of ground terminal and the quartz crystal oscillator output end is separately connected the different ground terminals of quartz crystal oscillator layer 10 (such as
Shown in Fig. 1).
Input end capacitor 102, the output capacitor 103 of quartz crystal oscillator 101 and quartz crystal oscillator are individually connected to ground terminal,
To prevent the ground connection noise of crystal oscillator and capacitor influence entire route mainboard ground terminal (that is, ground line, mainboard ground terminal lead to
Ground hole is crossed to be connected with ground plane), this designs the purpose that can also play electrostatic discharge protective.Because when there is electrostatic energy to pass through electricity
When the mainboard of road, electrostatic energy can be conducting to the ground terminal of mainboard.Pass through mainboard ground terminal, quartz crystal oscillator ground terminal, quartz crystal oscillator
The separation of the ground terminal of input terminal and output capacitor reduces to quartz crystal oscillator 101 and quartz crystal oscillator input terminal and output end electricity
Hold 102/103 interference.
Through the embodiments of the present invention in the case where not increasing plate layer and the conditional situation of structure space, it is ensured that crystal oscillator
There is smaller energy transmission, meet the requirements crystal oscillator energy, surveys printed circuit board by electromagnetic compatibility and signal integrity
Examination, improves the market competitiveness of printed circuit board.
Those of ordinary skill in the art will appreciate that all or part of the steps in the above method can be instructed by program
Related hardware is completed, and described program can store in computer readable storage medium, such as read-only memory, disk or CD
Deng.Optionally, one or more integrated circuits can be used also to realize in all or part of the steps of above-described embodiment.Accordingly
Ground, each module/unit in above-described embodiment can take the form of hardware realization, can also use the shape of software function module
Formula is realized.The utility model is not limited to the combination of the hardware and software of any particular form.
The above is only the preferred embodiments of the utility model, and certainly, the utility model can also have other various embodiments, In
In the case where the spirit of the present invention and its essence, those skilled in the art, which work as, to be made according to the utility model
Various corresponding changes and modifications out, but these corresponding changes and modifications all should belong to the utility model the attached claims
Protection scope.
Claims (2)
1. a kind of printed circuit board, including circuit main board, it is characterised in that:
The circuit main board includes at least quartz crystal oscillator layer；
The quartz crystal oscillator layer include at least quartz crystal oscillator, the capacitor of quartz crystal oscillator input terminal, quartz crystal oscillator output end capacitor,
First ground line and the resistance being connected across between the quartz crystal oscillator input terminal and output end；
Annular of first ground line for closure, the quartz crystal oscillator, the capacitor of quartz crystal oscillator input terminal and output end, bridging
Resistance between the quartz crystal oscillator input terminal and output end is located in first ground line, and in first ground connection
There is ground hole, the ground hole is connected with ground plane on line；
The ground plane is located at the lower layer of the quartz crystal oscillator layer, and the ground plane only has the second ground line；
Second ground line is connected by the ground hole with first ground line.
2. printed circuit board as described in claim 1, it is characterised in that:
The width of first ground line is greater than 300 millimeters.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201822154523.8U CN209624696U (en) | 2018-12-21 | 2018-12-21 | A kind of printed circuit board |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201822154523.8U CN209624696U (en) | 2018-12-21 | 2018-12-21 | A kind of printed circuit board |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN209624696U true CN209624696U (en) | 2019-11-12 |
Family
ID=68446372
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201822154523.8U Active CN209624696U (en) | 2018-12-21 | 2018-12-21 | A kind of printed circuit board |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN209624696U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2022062534A1 (en) * | 2020-09-27 | 2022-03-31 | 苏州浪潮智能科技有限公司 | Crystal oscillator circuit on pcb, pcb, and server |
-
2018
- 2018-12-21 CN CN201822154523.8U patent/CN209624696U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2022062534A1 (en) * | 2020-09-27 | 2022-03-31 | 苏州浪潮智能科技有限公司 | Crystal oscillator circuit on pcb, pcb, and server |
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