CN202713771U - PCB circuit capable of suppressing and preventing electromagnetic interference - Google Patents
PCB circuit capable of suppressing and preventing electromagnetic interference Download PDFInfo
- Publication number
- CN202713771U CN202713771U CN 201120559115 CN201120559115U CN202713771U CN 202713771 U CN202713771 U CN 202713771U CN 201120559115 CN201120559115 CN 201120559115 CN 201120559115 U CN201120559115 U CN 201120559115U CN 202713771 U CN202713771 U CN 202713771U
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- CN
- China
- Prior art keywords
- electromagnetic interference
- pcb circuit
- printed board
- suppresses
- power supply
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
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- Shielding Devices Or Components To Electric Or Magnetic Fields (AREA)
- Structure Of Printed Boards (AREA)
Abstract
The utility model discloses a PCB circuit capable of suppressing and preventing electromagnetic interference. The PCB circuit comprises a power supply and a printed circuit board; the power supply provide power to the printed circuit board; and the printed circuit board comprises three regions, namely, a power supply region, a digital signal region and an analog signal region which are successively arranged from right to left. The structural layout of the PCB circuit provided by the utility model can assist in saving the space of a circuit board so as to reduce cost, downsize a system and improve the reliability of the system.
Description
Technical field
The utility model discloses a kind of PCB circuit that suppresses and prevent electromagnetic interference, relate in particular to a kind of structure that prevents the PCB circuit board of electromagnetic interference, belong to electronic technology field.
Background technology
The design of prior art PCB circuit in most of the cases is a kind of tentative design process that depends on experience, and band bears the character of much blindness.Main interference and coupling mode is conducted interference and near-field interference on the PCB circuit.They usually can represent with stray resistance, electric capacity, inductance.Also have with numerical technique at present and extract the Autocad bag that the PCB stray parameter is set up simulation model, although simulation result can coincide better with measurement result, but these class methods method for designing in essence is to be transplanted on the software platform from hardware platform, can not instruct the stray parameter that how to connect up to reduce between circuit.These methods all are to remove Analysis interference from the angle of design circuit after all, rather than structural layout and Position Design.
Summary of the invention
The purpose of this utility model is to overcome above-mentioned the deficiencies in the prior art part, thereby a kind of PCB circuit that suppresses and prevent electromagnetic interference is provided.
The utility model is to realize by following method:
A kind of PCB circuit that suppresses and prevent electromagnetic interference, it comprises power supply and printed board; Described power supply is described printed board power supply, and described power supply is positioned in the described printed board.
Described printed board comprises three districts, is arranged in order from right to left respectively to be power supply area, digital signal district and analog signal district.
Described digital signal connects up in all digital signal districts of printed board; Described analog signal connects up in all analog signal districts of printed board.
Spacing between described wiring is 4～10mil; When described wiring density was low, holding wire should be tried one's best short and wide.
The length of described wiring is directly proportional with obstructing with inductance value; The width of described wiring and inductance value are inversely proportional to obstructing.
Described printed board also comprises holding wire, components and parts, pad.
Bore edges arrives the distance of printed board greater than 1mm in the described pad;
The described components and parts that are positioned at the printed board edge from the printed board edge more than or equal to 2mm;
Described power supply area also comprises power line and power pins; Described power pins place is provided with 1 decoupling capacitance at least.Spurious signal by different decoupling capacitance value filtering different frequencies.
The width of described power line is greater than the width of holding wire; Described signal live width is: 0.05～0.3mm, described power supply live width is 1.2～2.5mm.
Reducing the high-frequency loop area during wiring is a very important principle, and wiring is as much as possible short and wide.Crucial during wiring, important circuit will shield, and can effectively completely cut off external disturbance, has also completely cut off the interference to the outside simultaneously, and can not affect Signal integrity, and front end simulation amplifier section has adopted shielding measure in the utility model; The input of high-gain amplifier is away from output; The casacade multi-amplifier cascade does not intersect.
The beneficial effects of the utility model: the utility model topology layout can be saved the space of circuit board, diminish, prevent electromagnetic interference, reduce interference and coupling unnecessary between the printed circuit with Cost reduction, system bulk, reduce noise, system reliability raising; This inhibition resist technology of the present utility model radiation-emitting that can reduce loop can reduce its susceptibility again in addition.
Description of drawings
Fig. 1 the utility model structural representation frame diagram
Embodiment
Further describe the utility model below in conjunction with accompanying drawing 1:
A kind of PCB circuit that suppresses and prevent electromagnetic interference, it comprises power supply (1) and printed board (2); Described power supply (1) is described printed board (2) power supply, and described power supply (1) is positioned in the described printed board (2).
To carry out correct subregion during printed board (2) wiring.The interference source of mixed signal circuit generally has: high speed logic circuit, high-speed clock circuit, video display circuit and some contain the electrical equipment of electric contact and equipment etc.; The circuit that easily is disturbed has: high speed logic circuit, high-speed clock circuit, video circuit, dsp processor, low level analog circuit etc.; And the impact that combinational logic circuit, linear power supply, power amplifier etc. are difficult for being interfered.Analyze thus, described printed board comprises three districts, is arranged in order from right to left respectively to be power supply area (201), digital signal district (202) and analog signal district (203).
Described digital signal connects up in all digital signal districts (202) of printed board (2); Described analog signal connects up in all analog signal districts (203) of printed board (2).
Spacing between described wiring is 4～10mil.
The length of described wiring is directly proportional with obstructing with inductance value; The width of described wiring and inductance value are inversely proportional to obstructing.
Described printed board also comprises holding wire (204), components and parts (205), pad (206).
The interior bore edges of described pad (206) arrives the distance of printed board (2) greater than 1mm;
The described components and parts (204) that are positioned at printed board (2) edge from printed board (2) edge more than or equal to 2mm;
Described power supply area (201) also comprises power line (301) and power pins (302); Described power pins (302) locates to be provided with at least 1 decoupling capacitance (401).Analog integrated circuit or digital integrated circuit are all locating to place decoupling capacitance (401) near power pins (302) as far as possible, and be better with a little electric capacity and a large capacitive effect, as: 103 and 106.The electromagnetic interference that decoupling capacitance (401) has removed on the one hand high-frequency noise and produced because of the peak current saltus step; Be on the other hand in this Power Management Design energy storage capacitor, provide and absorb the electric energy that charges and discharge that this circuit state changes moment.
The width of described power line (301) is greater than the width of holding wire (204); Described holding wire (204) is wide to be: 0.05～0.3mm, and described power line (301) is wide to be 1.2～2.5mm; Further described generally holding wire (204) is wide is: 0.2～0.3mm, the thinnest width of described holding wire (204) can reach 0.05～0.07mm.
Claims (10)
1. a PCB circuit that suppresses and prevent electromagnetic interference is characterized in that, comprises power supply and printed board; Described power supply is described printed board power supply.
2. a kind of PCB circuit that suppresses and prevent electromagnetic interference according to claim 1 is characterized in that, described printed board comprises three districts, is arranged in order from right to left respectively to be power supply area, digital signal district and analog signal district.
3. a kind of PCB circuit that suppresses and prevent electromagnetic interference according to claim 1 is characterized in that, described digital signal connects up in all digital signal districts of printed board; Described analog signal connects up in all analog signal districts of printed board.
4. a kind of PCB circuit that suppresses and prevent electromagnetic interference according to claim 1 is characterized in that, the spacing between described wiring is 4～10mil.
5. a kind of PCB circuit that suppresses and prevent electromagnetic interference according to claim 1 is characterized in that, the length of described wiring is directly proportional with obstructing with inductance value; The width of described wiring and inductance value are inversely proportional to obstructing.
6. a kind of PCB circuit that suppresses and prevent electromagnetic interference according to claim 1 is characterized in that, described printed board also comprises holding wire, components and parts, pad.
7. a kind of PCB circuit that suppresses and prevent electromagnetic interference according to claim 7 is characterized in that, bore edges arrives the distance of printed board greater than 1mm in the described pad;
8. according to claim 1 or each described a kind of PCB circuit that suppresses and prevent electromagnetic interference of 7, it is characterized in that, the described components and parts that are positioned at the printed board edge from the printed board edge more than or equal to 2mm;
9. a kind of PCB circuit that suppresses and prevent electromagnetic interference according to claim 2 is characterized in that, described power supply area also comprises power line and power pins; Described power pins place is provided with 1 decoupling capacitance at least.
10. according to claim 6 or 9 each described a kind of PCB circuit that suppress and prevent electromagnetic interference, it is characterized in that, the width of described power line is greater than the width of holding wire; Described signal live width is: 0.05～0.3mm, described power supply live width is 1.2～2.5mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201120559115 CN202713771U (en) | 2011-12-29 | 2011-12-29 | PCB circuit capable of suppressing and preventing electromagnetic interference |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201120559115 CN202713771U (en) | 2011-12-29 | 2011-12-29 | PCB circuit capable of suppressing and preventing electromagnetic interference |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202713771U true CN202713771U (en) | 2013-01-30 |
Family
ID=47594022
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201120559115 Expired - Fee Related CN202713771U (en) | 2011-12-29 | 2011-12-29 | PCB circuit capable of suppressing and preventing electromagnetic interference |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN202713771U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106231783A (en) * | 2016-08-12 | 2016-12-14 | 深圳崇达多层线路板有限公司 | A kind of printed circuit board reducing inter-signal interference and wiring method |
-
2011
- 2011-12-29 CN CN 201120559115 patent/CN202713771U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106231783A (en) * | 2016-08-12 | 2016-12-14 | 深圳崇达多层线路板有限公司 | A kind of printed circuit board reducing inter-signal interference and wiring method |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20130130 Termination date: 20141229 |
|
| EXPY | Termination of patent right or utility model |