CN101398517A - Single fiber three-way photoelectric module electric cross talk restraining method and structure thereof - Google Patents
Single fiber three-way photoelectric module electric cross talk restraining method and structure thereof Download PDFInfo
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- CN101398517A CN101398517A CNA2008101969286A CN200810196928A CN101398517A CN 101398517 A CN101398517 A CN 101398517A CN A2008101969286 A CNA2008101969286 A CN A2008101969286A CN 200810196928 A CN200810196928 A CN 200810196928A CN 101398517 A CN101398517 A CN 101398517A
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- 238000004088 simulation Methods 0.000 claims description 27
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- 230000009286 beneficial effect Effects 0.000 abstract description 2
- 238000001228 spectrum Methods 0.000 description 4
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Abstract
The invention discloses a method and a structure used for restraining electrical crosstalk of single-fiber three-directional photoelectric module, relating to a D/A mixed signal module in communications equipment. The method comprises the steps as follows: (1) wires are arranged on the digital circuit part and the analog circuit part which are arranged on a printing circuit board by regions; (2) the signal loops of the analog circuit part are connected by a bridge way; (3) the analog circuit part is matched with the printing circuit board by a design pipe shell to form a shielding cover, thus restraining the spatial radiation interference; (4) an optical device is electrically connected with the pipe shell by an electromagnetic-immune elastic sheet, thus reducing the interference caused by the optical device. The method and the structure preferably restrain the interference of the digital circuit on the analog circuit after the digit and analog in the single-fiber three-directional photoelectric module are integrated; the pipe shell has simple and reliable design and low cost, and is beneficial for installation; when the normal communication of the digital data is ensured, the television signal with high quality can be provided; the method and the structure is applicable to the electrical crosstalk restraining of all single-fiber three-directional photoelectric modules.
Description
Technical field
The present invention relates to the digital-to-analogue mixed signal module in a kind of communication facilities, relate in particular to a kind of single fiber three-way photoelectric module electric cross talk restraining method and structure thereof.
Background technology
User side can be realized simulating and receive and the single fiber three-way photoelectric module of digital transmitting and receiving is Fiber to the home (FTTH) a kind of key modules that system needs.(the G.983.3 agreement of ITU-T) is to the regulation of operation wavelength, and its data channel works in 1490nm (descending) and 1310nm (up) wavelength, and CATV (cable television) (CATV) passage works in the 1555nm wavelength based on standardization department of international telecommunication union telecommunication.CATV (cable television) tunnels analogy circuit work frequency scope is 47～870MHz, belongs to radio band, on the circuit crosstalk and space radiation very responsive; The numerical portion operating rate reaches 155Mbit/s simultaneously, a large amount of spectrum components is arranged in this scope, forms crosstalking of numerical portion, a Discrete Distribution of crosstalking, and the carrier-to-noise ratio of deterioration analog receiver influences television picture quality.
Summary of the invention
Purpose of the present invention just is to overcome above-mentioned shortcoming and the problem that exists in the prior art, a kind of single fiber three-way photoelectric module electric cross talk restraining method and structure thereof are provided, no matter can suppress well is the interference that circuit conduction or external electromagnetic field coupling cause, satisfies the actual needs of application system.
The object of the present invention is achieved like this:
One, single fiber three-way photoelectric module electric cross talk restraining method (abbreviation this method)
This method comprises the following steps:
1. with part of the digital circuit on the printed circuit board (PCB) (PCB) and the wiring of artificial circuit part subregion;
2. the signal circuit with artificial circuit part connects by the bridge joint mode;
3. artificial circuit part is cooperated with printed circuit board (PCB) by design pipe shell to form radome, suppress space radiation and disturb;
4. optical device is realized electric joining by electromagnetism immunity (EMI) shell fragment and shell, reduce because the interference that optical device causes.
Two, based on the structure (structure that is called for short this module) that suppresses electric single fiber three-way photoelectric module of crosstalking
The structure of this module is made up of printed circuit board (PCB), shell and single fiber three-way photoelectric device.
Printed circuit board (PCB) is received and is controlled these four parts by digital transmission, digital received, simulation and constitutes; Control section is provided with the working point that is configured into its three part of Xingqi of its input/output port (I/O mouth) by a single-chip microcomputer and duty reports etc., layout between two parties on printed circuit board (PCB); Digital transmission part and digital received part occupy left layout on printed circuit board (PCB); The simulation receiving unit is because poor anti jamming capability occupies upper right corner layout on the printed circuit board (PCB) away from the digital interference source.
The simulation receiving unit of printed circuit board (PCB) is locked on the shell base by screw, increases 1mm around the shell cover rim, and is staggered with base after loam cake covers, and forms dual isolation channel with the external world around module; The shell loam cake is increased at numerical portion and simulation receiving unit junction, forms and cuts apart wall, cuts apart wall and be pressed in printed circuit board (PCB) and be staggered to form simulation radome partly with base after loam cake covers.
Design has U type groove on the shell base, and the single fiber three-way photoelectric device is placed wherein, and C type EMI shell fragment is stuck between device and the shell base; Loam cake is pressed in the upper surface of rubber-like EMI shell fragment, guarantees to form good being electrically connected.
The present invention has following advantage and good effect:
1. suppressed the interference of the digital circuit that causes after digital simulation in the single fiber three-way module integrates preferably to mimic channel;
2. the shell design is simple and easy reliable, and cost is low, is beneficial to installation.
3. electromagnetic-immune elastic sheet is simple and easy reliable.
4. when guaranteeing the numerical data normal communication, television signal with high quality can be provided, module performance index with the sort circuit power supply all can satisfy customer requirement: DI〉60dB (20M-487MHz simulated television frequency range), DI〉45dB (487M-880MHz Digital Television frequency range)
The present invention is applicable to that the electricity of all single fiber three-way photoelectric modules is crosstalked and suppresses.
Description of drawings
Fig. 1 is the structured flowchart of this module;
Fig. 2 is the structural representation of this module loam cake and base;
Fig. 3 is the output spectrum figure of simulating signal before squelch;
Fig. 4 .1 is the structural representation (side-looking) of electromagnetic-immune elastic sheet;
Fig. 4 .2 is the structural representation (main looking) of electromagnetic-immune elastic sheet;
Fig. 5 is the output spectrum figure of simulating signal after squelch.
Wherein:
0-printed circuit board (PCB);
1-control section;
2-digital transmission part;
3-digital received part;
4-simulation receiving unit;
5-digital-to-analogue bridge region;
6-base, 6.1-radome, 6.2-U-lag;
7-loam cake, 7.1-divider wall, 7.2-cut apart wall;
8-electromagnetism immunity (EMI) shell fragment, 8.1-projection, the reed of 8.2-middle fluting.
Embodiment
Further specify below in conjunction with the structure of drawings and Examples this module.
One, agent structure
As Fig. 1, the structure of this module comprises printed circuit board (PCB) 0, control section 1, digital transmission part 2, digital received part 3, simulation receiving unit 4, digital-to-analogue bridge region 5, base 6 and loam cake 7;
Between base 6 and loam cake 7, be provided with printed circuit board (PCB) 0, on printed circuit board (PCB) 0, control section 1 layout placed in the middle; Digital transmission part 2 and digital received part 3 occupy left layout; Simulation receiving unit 4 occupies upper right corner layout;
Connect by digital-to-analogue bridge region 5 between digital transmission part 2, digital received part 3 and the simulation receiving unit 4.
The structure working principle of this module:
Noise is coupled to that a maximum part is to pass through conduction pattern in the circuit, if a signal line is passed through in a noisy environment, this lead will receive noise and be delivered to the entire circuit part by induction, so analog signal line can not enter the digital signal zone, digital-to-analogue is separated layout can reduce the conduction coupling.
With control section 1, digital transmission part 2, digital received part 3, simulation receiving unit 4 zonings; Control section 1 by a single-chip microcomputer to its input/output port (I/O mouth) be configured into that its three emission of Xingqi receive the working point layout between two parties on printed circuit board (PCB) 0 is set and duty reports etc.; Because the poor anti jamming capability of simulation receiving unit 4 should be away from the digital interference source, the upper right corner, former residence layout.
The main body of described control section 1 is a kind of control chip and support circuit thereof based on microprocessor;
The main body of described digital transmission part 2 is a kind of digital transmission chip for driving and support circuit thereof;
The main body of described digital received part 3 is that a kind of digital received is amplified chip and support circuit thereof;
The main body of described simulation receiving unit 4 is that a kind of simulation receives amplification chip and support circuit thereof.
Two, additional structure
Noise is coupled to that another kind of mode is radiation in the circuit.The clock circuit of microprocessor and the digital transmission of 155M are the noise sources of this module, and noise profile forms and disturbs to entire spectrum.And with respect to digital signal, analogue signal amplitude is littler, easier being interfered, and how reducing numerical portion needs emphasis to consider to simulation interference partly.
1, base 6 and loam cake 7
The digital transmission end is the high-frequency signal of 155M, can radiated electromagnetic wave during work.Simulation receiving unit 4 is locked on the base 6 by screw.
Be provided with the divider wall 7.1 about high 1mm in the edge of loam cake 7, after loam cake 7 covers with base 6 be staggered in this module around form dual divider wall with the external world; Loam cake 7 is provided with in digital transmission, receiving unit 2,3 and simulation part 4 junctions cuts apart wall 7.2 about high 1mm, cuts apart wall 7.2 and be pressed in the radome 6.1 that is staggered to form simulation part 4 on the printed circuit board (PCB) 0 with base 6 after loam cake 7 covers; Base 6 is provided with U type groove 6.2, and the single fiber three-way photoelectric device is placed wherein, suppresses space radiation and disturbs.
2, the processing of single fiber three-way photoelectric device
When above scheme has considered that all noise improves significantly really, still still can not satisfy the relatively harsher requirement of user.As Fig. 3, near 622MHz, produce bigger interference, these noise variances distribute, and being called " inserting noise (DI) " these insertion frequencies is that the frequency multiplication of digitally transmitted signals frequency 155M and the crystal oscillator of control circuit single-chip microcomputer (MCU) frequency 20MHz are modulated at the noise that causes on the simulating signal.
Because what adopt is the integral single fibre three-way photoelectric device, it is common ground that digital transmission and simulation receive, when digital transmission part 2 has the high-frequency signal emission, must cause the noise of device ground pin, these noises can be by device crosstalk to analog device ground, high-gain amplification through analogue amplifier causes output noise then, and these interference noises are measured as Fig. 3 by frequency spectrograph.In this digital-to-analogue mixing module; it is impossible not disturbing; the way of reality is to be pressed into certain scope, and the standard that the Verizon of U.S. telecom operators proposes is that the analog television channels signal noise ratio is higher than 60dB, and the digital television channel signal noise ratio is higher than 45dB.
The present invention adopts easy, reliable, an easy-to-install electromagnetic-immune elastic sheet 8 to address this problem:
In digital transmission part 2, be provided with electromagnetic-immune elastic sheet 8 between its shell loam cake 7 and the device, the side of electromagnetic-immune elastic sheet 8 is stuck in shell base 6 and U type groove 6.2 the insides.
As Fig. 4 .1,4.2, electromagnetic-immune elastic sheet 8 is made by electric conductivity, the good copper product of ductility;
Its structure is: electromagnetic-immune elastic sheet 8 c-shaped shapes, its top and the bottom are provided with projection 8.1 respectively, and the reed 7.2 of fluting in the middle of its middle part is provided with is to keep elasticity and to be easy to installation property; When loam cake 7 is depressed, can flexiblely be pressed on the device, thereby keep good ground connection effect.
3, checking
As Fig. 5, consideration of the present invention is received this bigger ground level of shell effectively with optical device and is got on according to being that signal is always selected low-impedance propagated principle, can reduce the noise that is transmitted to the simulation part effectively, solves the device cross-interference issue well.
This module, the test index of each can both reach CATV required standard index, CNR〉48dB@-6dBm, CSO〉56dB@+1dBm, CTB〉59dB@+1dBm, MER〉35dB@-6dBm, the functional of module has been described, thereby reflected feasibility of the present invention.
Claims (3)
1, a kind of single fiber three-way photoelectric module electric cross talk restraining method is characterized in that comprising the following steps:
1. with part of the digital circuit on the printed circuit board (PCB) and the wiring of artificial circuit part subregion;
2. the signal circuit with artificial circuit part connects by the bridge joint mode;
3. artificial circuit part is cooperated with printed circuit board (PCB) by design pipe shell to form radome, suppress space radiation and disturb;
4. optical device is realized electric joining by electromagnetism immunity (EMI) shell fragment and shell, reduce because the interference that optical device causes.
2, a kind of based on suppressing the single fiber three-way photoelectric module that electricity is crosstalked, it is characterized in that the structure of this module comprises printed circuit board (PCB) (0), control section (1), digital transmission part (2), digital received part (3), simulation receiving unit (4), digital-to-analogue bridge region (5), base (6) and loam cake (7);
Between base (6) and loam cake (7), be provided with printed circuit board (PCB) (0), on printed circuit board (PCB) (0), control section (1) layout placed in the middle; Digital transmission part (2) and digital received part (3) occupy left layout; Simulation receiving unit (4) occupies upper right corner layout;
Digital transmission part (2), digital received part (3), simulation receiving unit (4) are connected by wiring with control section (1) respectively;
Connect by digital-to-analogue bridge region (5) between digital transmission part (2), digital received part (3) and the simulation receiving unit (4).
3, described a kind of by claim 1 based on suppressing the single fiber three-way photoelectric module that electricity is crosstalked, it is characterized in that:
In digital transmission part (2), be provided with electromagnetic-immune elastic sheet (8) between its shell loam cake (7) and the device, the side of electromagnetic-immune elastic sheet (8) is stuck in shell base (6) and U type groove (6.2) the inside;
The c-shaped shape of electromagnetic-immune elastic sheet (8), its top and the bottom are provided with projection (8.1) respectively, the reed (7.2) of fluting in the middle of its middle part is provided with.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2008101969286A CN101398517B (en) | 2008-09-12 | 2008-09-12 | Single fiber three-way photoelectric module electric cross talk restraining method and structure thereof |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2008101969286A CN101398517B (en) | 2008-09-12 | 2008-09-12 | Single fiber three-way photoelectric module electric cross talk restraining method and structure thereof |
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| Publication Number | Publication Date |
|---|---|
| CN101398517A true CN101398517A (en) | 2009-04-01 |
| CN101398517B CN101398517B (en) | 2012-03-07 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN2008101969286A Expired - Fee Related CN101398517B (en) | 2008-09-12 | 2008-09-12 | Single fiber three-way photoelectric module electric cross talk restraining method and structure thereof |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102573275A (en) * | 2010-12-10 | 2012-07-11 | 亚旭电脑股份有限公司 | Printed circuit board of multi-port gigabit passive optical network and layout method |
| CN104239632A (en) * | 2014-09-11 | 2014-12-24 | 浪潮电子信息产业股份有限公司 | Method for reducing VGA (Video Graphics Array) wiring crosstalk influence |
| CN112234590A (en) * | 2020-10-10 | 2021-01-15 | 绵阳市维博电子有限责任公司 | Switch point machine action voltage detection device and PCB (printed circuit board) distribution mode thereof |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2842456Y (en) * | 2005-11-16 | 2006-11-29 | 福州高意通讯有限公司 | Single fiber 3-way photoelectric assembly |
| CN201260171Y (en) * | 2008-09-12 | 2009-06-17 | 武汉电信器件有限公司 | Single-fiber three-way photoelectric module based on electric crosstalk inhibition |
-
2008
- 2008-09-12 CN CN2008101969286A patent/CN101398517B/en not_active Expired - Fee Related
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102573275A (en) * | 2010-12-10 | 2012-07-11 | 亚旭电脑股份有限公司 | Printed circuit board of multi-port gigabit passive optical network and layout method |
| CN102573275B (en) * | 2010-12-10 | 2014-11-12 | 亚旭电脑股份有限公司 | Printed circuit board of multi-port gigabit passive optical network and layout method |
| CN104239632A (en) * | 2014-09-11 | 2014-12-24 | 浪潮电子信息产业股份有限公司 | Method for reducing VGA (Video Graphics Array) wiring crosstalk influence |
| CN104239632B (en) * | 2014-09-11 | 2017-06-30 | 浪潮电子信息产业股份有限公司 | A kind of method of reduction VGA cabling cross talk effects signals |
| CN112234590A (en) * | 2020-10-10 | 2021-01-15 | 绵阳市维博电子有限责任公司 | Switch point machine action voltage detection device and PCB (printed circuit board) distribution mode thereof |
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| Publication number | Publication date |
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| CN101398517B (en) | 2012-03-07 |
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Inventor after: Zhang Jun Inventor after: Yu Xianghong Inventor after: Mi Quanlin Inventor after: Wu Tianshu Inventor after: Luo Jianfeng Inventor before: Wu Tianshu Inventor before: Luo Jianfeng |
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Free format text: CORRECT: INVENTOR; FROM: WU TIANSHU LUO JIANFENG TO: ZHANG JUN YU XIANGHONG MI QUANLIN WU TIANSHU LUO JIANFENG |
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Granted publication date: 20120307 |