CN102340926A - Printed circuit board - Google Patents
Printed circuit board Download PDFInfo
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- CN102340926A CN102340926A CN201010236801XA CN201010236801A CN102340926A CN 102340926 A CN102340926 A CN 102340926A CN 201010236801X A CN201010236801X A CN 201010236801XA CN 201010236801 A CN201010236801 A CN 201010236801A CN 102340926 A CN102340926 A CN 102340926A
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- audio
- circuit board
- printed circuit
- chip
- audio frequency
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Abstract
The invention discloses a printed circuit board which comprises a signal layer, a power supply layer and a ground layer, wherein one side of the signal layer is provided with an analog audio input/output port; an audio chip is arranged on the signal layer and positioned near the analog audio input/output port; the audio chip comprises a chip body, a first set of audio pins and a second set of audio pins, the first set of audio pins are connected with the analog audio input/output port, and the second set of audio pins are connected with an external control chip; and the power supply layer and the ground layer are respectively divided into an audio part and a digital part by a dividing groove, the audio part is not electrically connected with digital part, the two audio parts are only used as reference planes of routing between the first set of audio pins and the analog audio input/output port, and the two digital parts are used as reference planes of routing between the second set of audio pins of the audio chip and the external control chip. By using the printed circuit board disclosed by the invention, the electromagnetic radiation generated by the analog audio input/output port can be reduced.
Description
Technical field
The present invention relates to a kind of printed circuit board (PCB).
Background technology
At present, on printed circuit board (PCB)s such as computer main frame panel, can be designed with the access that analogue audio frequency input/output end port confession user makes phonetic function, like microphone, loudspeaker etc.Because audio signal wire is an independent line at a slow speed; So on printed circuit board (PCB), be easy to receive the coupling of noise; These noises maybe be from other circuit or bus plane, ground plane etc.; These noises can produce electromagnetic radiation with the signal cable that is connected to the audio frequency input/output end port as transmitting antenna when doing the system electromagnetic interference and measure.
Summary of the invention
In view of foregoing, be necessary to provide a kind of printed circuit board (PCB) that reduces the electromagnetic radiation that the analogue audio frequency input/output end port produced.
A kind of printed circuit board (PCB); Comprise a signals layer, a bus plane and a ground plane; One side of this signals layer is provided with the analogue audio frequency input/output end port; One audio chip be located on this signals layer and be positioned at this analogue audio frequency input/output end port near; First group of audio frequency pin that this audio chip comprises a body, link to each other with this analogue audio frequency input/output end port and the second group of audio frequency pin that links to each other with the external control chip; This bus plane and ground plane all are divided into an audio-frequency unit and a numerical portion of two non-electric connections through a slot segmentation, this two audio-frequency unit is only as the reference planes of cabling between first group of audio frequency pin of this audio chip and this analogue audio frequency input/output end port, and this two numerical portion is as the reference planes of cabling between second group of audio frequency pin of this audio chip and this external control chip.
Compare prior art; Printed circuit board (PCB) of the present invention has carried out bus plane and ground plane as above to cut apart; And make the reference planes of cabling between this analogue audio frequency input/output end port and this audio chip and the reference planes of other assembly on the printed circuit board (PCB) carry out effective isolation, so can prevent effectively that coupling noise is to this analogue audio frequency input/output end port.
Description of drawings
Combine preferred embodiments that the present invention is described in further detail with reference to the accompanying drawings:
Fig. 1 is the vertical view of printed circuit board (PCB) preferred embodiments of the present invention.
Fig. 2 is the sketch map of the bus plane of printed circuit board (PCB) preferred embodiments of the present invention.
Fig. 3 is the schematic partial cross-sectional view of printed circuit board (PCB) preferred embodiments of the present invention.
The main element symbol description
Printed circuit board (PCB) 100
Slot segmentation 122,132
Audio-frequency unit 124,134
Numerical portion 126,136
Via hole 160,170
Analogue audio frequency input/output end port 200
Audio chip 300
First group of audio frequency pin 320
Second group of audio frequency pin 330
Noise electric capacity 400
South Bridge chip 500
Embodiment
Please refer to Fig. 1 to Fig. 3; The preferred embodiments of printed circuit board (PCB) 100 of the present invention comprises one first signals layer 110, a bus plane 120, a ground plane 130 and a secondary signal layer 140; Also be provided with dielectric layer (not label) between above-mentioned every adjacent two layers; One side of this first signals layer 110 is provided with analogue audio frequency input/output end port 200; One audio chip 300 be located on this first signals layer 110 and be positioned at this analogue audio frequency input/output end port 200 near, be used to control the input and the output of this analogue audio frequency input/output end port 200.This audio chip 300 comprises a body 310 and some signal pins of being located on this body 310, and these signal pins comprise first group of audio frequency pin 320 that links to each other with this analogue audio frequency input/output end port 200 and the second group of audio frequency pin 330 that links to each other with external control chip such as South Bridge chip 500 (several the cablings 14 and 16 that only draw among the figure are as signal).Also be provided with other assembly on this printed circuit board (PCB) 100, like central processing unit etc., because it is a prior art, so locate not shown.
Please refer again to Fig. 2; The bus plane 120 of this printed circuit board (PCB) 100 is divided into an audio-frequency unit 124 and a numerical portion 126 of two non-electric connections through a slot segmentation 122; The ground plane 130 of this printed circuit board (PCB) 100 has been done like 120 duplicate cutting apart of bus plane equally; Also comprise the audio-frequency unit 134 and the numerical portion 136 (referring to Fig. 3) that are divided into by a slot segmentation 132, concrete structure is not being given unnecessary details here.This slot segmentation 122 and 132 position do not have particular provisions; As long as satisfy following relation: this audio- frequency unit 124 and 134 common reference planes as the cabling between this analogue audio frequency input/output end port 200 and this audio chip 300, that is the reference planes of the cabling 14 between this first group of audio frequency pin 320 and this analogue audio frequency input/output end port 200 are this audio- frequency unit 124 and 134; 126 of this numerical portions still provide the power supply reference for other assembly on the printed circuit board (PCB) 100 as the power supply reference planes; This numerical portion 136 still provides the ground connection reference for other assembly on the printed circuit board (PCB) 100 as the ground connection reference planes; Power supply reference planes like the cabling 16 between this second group of audio frequency pin 330 and the South Bridge chip 500 are this numerical portion 126, and the ground connection reference planes are this numerical portion 136.
Please continue with reference to figure 1 and Fig. 3; Printed circuit board (PCB) 100 of the present invention also comprises four noise electric capacity 400; Wherein two noise electric capacity 400 be positioned at this analogue audio frequency input/output end port 200 near, two other noise electric capacity 400 be positioned at this audio chip 300 near.Audio-frequency unit 124, the second ends 412 that first end 410 of each noise electric capacity 400 all is connected to this bus plane 120 through a via hole 160 all are connected to the numerical portion 136 of this ground plane 130 through a via hole 170.The quantity of these noise electric capacity 400 can increase or reduce as required, and getting capacitance here is 1000 pico farads.
Printed circuit board (PCB) 100 of the present invention is owing to carried out bus plane 120 and ground plane 130 as above to cut apart; And make the reference planes of cabling between this analogue audio frequency input/output end port 200 and this audio chip 300 and the reference planes of other assembly on the printed circuit board (PCB) 100 carry out effective isolation, so can prevent effectively that coupling noise is to this analogue audio frequency input/output end port 200.In addition; Owing to be provided with above-mentioned noise electric capacity 400; So when return flow path is provided, also the coupling noise on the audio-frequency unit 124 has been arrived on the numerical portion 136; Thereby reduced the electromagnetic interference noise that radiates by this analogue audio frequency input/output end port 200, so, improved the quality of transmission signals on the printed circuit board (PCB) 100.
Claims (4)
1. printed circuit board (PCB); Comprise a signals layer, a bus plane and a ground plane; One side of this signals layer is provided with the analogue audio frequency input/output end port; One audio chip be located on this signals layer and be positioned at this analogue audio frequency input/output end port near; First group of audio frequency pin that this audio chip comprises a body, link to each other with this analogue audio frequency input/output end port and the second group of audio frequency pin that links to each other with the external control chip; It is characterized in that: this bus plane and ground plane all are divided into an audio-frequency unit and a numerical portion of two non-electric connections through a slot segmentation; This two audio-frequency unit is only as the reference planes of cabling between first group of audio frequency pin of this audio chip and this analogue audio frequency input/output end port, and this two numerical portion is as the reference planes of cabling between second group of audio frequency pin of this audio chip and this external control chip.
2. printed circuit board (PCB) as claimed in claim 1; It is characterized in that: this first signals layer also is provided with at least one noise electric capacity; First end of each noise electric capacity all is connected to the audio-frequency unit of this bus plane through a via hole, second end all is connected to the numerical portion of this ground plane through a via hole.
3. printed circuit board (PCB) as claimed in claim 2 is characterized in that: the quantity of noise electric capacity is four, wherein two be positioned at this analogue audio frequency input/output end port near, two other be positioned at this audio chip near.
4. printed circuit board (PCB) as claimed in claim 2 is characterized in that: the capacitance of this noise electric capacity is 1000 pico farads.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201010236801XA CN102340926A (en) | 2010-07-26 | 2010-07-26 | Printed circuit board |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201010236801XA CN102340926A (en) | 2010-07-26 | 2010-07-26 | Printed circuit board |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN102340926A true CN102340926A (en) | 2012-02-01 |
Family
ID=45516342
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201010236801XA Pending CN102340926A (en) | 2010-07-26 | 2010-07-26 | Printed circuit board |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN102340926A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107509301A (en) * | 2017-07-19 | 2017-12-22 | 青岛海信宽带多媒体技术有限公司 | A kind of circuit board and optical module |
| CN110602866A (en) * | 2019-08-01 | 2019-12-20 | 苏州浪潮智能科技有限公司 | Method and system for reducing influence of far-end reference power supply noise on signal quality |
| CN112637735A (en) * | 2020-12-08 | 2021-04-09 | 珠海全志科技股份有限公司 | Board-level noise elimination circuit of analog signal and audio output equipment |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2816894Y (en) * | 2005-07-28 | 2006-09-13 | 上海环达计算机科技有限公司 | Audio frequency circuit of inhibiting noise interference |
| CN2840162Y (en) * | 2005-10-28 | 2006-11-22 | 上海环达计算机科技有限公司 | Electronic device with suppressing electromagnetic wave radiation of audio frequency signal |
| CN101005731A (en) * | 2006-01-20 | 2007-07-25 | 佛山市顺德区顺达电脑厂有限公司 | EMI supppression method for audio frequency signal |
| CN200990726Y (en) * | 2006-12-27 | 2007-12-12 | 鸿富锦精密工业（深圳）有限公司 | Printed circuit board |
| JP2008130747A (en) * | 2006-11-20 | 2008-06-05 | Nec Corp | Printed wiring board |
-
2010
- 2010-07-26 CN CN201010236801XA patent/CN102340926A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2816894Y (en) * | 2005-07-28 | 2006-09-13 | 上海环达计算机科技有限公司 | Audio frequency circuit of inhibiting noise interference |
| CN2840162Y (en) * | 2005-10-28 | 2006-11-22 | 上海环达计算机科技有限公司 | Electronic device with suppressing electromagnetic wave radiation of audio frequency signal |
| CN101005731A (en) * | 2006-01-20 | 2007-07-25 | 佛山市顺德区顺达电脑厂有限公司 | EMI supppression method for audio frequency signal |
| JP2008130747A (en) * | 2006-11-20 | 2008-06-05 | Nec Corp | Printed wiring board |
| CN200990726Y (en) * | 2006-12-27 | 2007-12-12 | 鸿富锦精密工业（深圳）有限公司 | Printed circuit board |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107509301A (en) * | 2017-07-19 | 2017-12-22 | 青岛海信宽带多媒体技术有限公司 | A kind of circuit board and optical module |
| CN107509301B (en) * | 2017-07-19 | 2019-12-20 | 青岛海信宽带多媒体技术有限公司 | Circuit board and optical module |
| CN110602866A (en) * | 2019-08-01 | 2019-12-20 | 苏州浪潮智能科技有限公司 | Method and system for reducing influence of far-end reference power supply noise on signal quality |
| CN110602866B (en) * | 2019-08-01 | 2021-03-09 | 苏州浪潮智能科技有限公司 | Method and system for reducing influence of far-end reference power supply noise on signal quality |
| US11490505B2 (en) | 2019-08-01 | 2022-11-01 | Inspur Suzhou Intelligent Technology Co., Ltd. | Method for reducing influence of remote reference power noise on signal quality |
| CN112637735A (en) * | 2020-12-08 | 2021-04-09 | 珠海全志科技股份有限公司 | Board-level noise elimination circuit of analog signal and audio output equipment |
| CN112637735B (en) * | 2020-12-08 | 2022-04-26 | 珠海全志科技股份有限公司 | Board-level noise elimination circuit of analog signal and audio output equipment |
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Application publication date: 20120201 |