CN103326794B - Adjusting method for home gateway communication terminal failing to pass radiated emission disturbance test - Google Patents
Adjusting method for home gateway communication terminal failing to pass radiated emission disturbance test Download PDFInfo
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- CN103326794B CN103326794B CN201310182230.XA CN201310182230A CN103326794B CN 103326794 B CN103326794 B CN 103326794B CN 201310182230 A CN201310182230 A CN 201310182230A CN 103326794 B CN103326794 B CN 103326794B
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Abstract
The invention discloses an adjusting method for a home gateway communication terminal failing to pass a radiated emission disturbance test. Aiming at the radiation situation from the interior of a single plate, an adjusting scheme 1, an adjusting scheme 2 and an adjusting scheme 3 are adopted finally. Aiming at the radiation situation from an external signal port, an adjusting scheme 4, an adjusting scheme 5 and an adjusting scheme 6 are adopted finally. The adjusting method has the advantages that a frame and a structure of an equipment circuit of the home gateway communication terminal are not changed, the research and development speed of electronic equipment is increased fast so that the equipment can pass radiated emission disturbance as soon as possible, a passing rate of the radiated emission disturbance of the home gateway communication terminal equipment can be increased remarkably, and the adjusting method is simple and convenient to use and feasible, lowers the research and development cost of the home gateway communication terminal, and has good cost performance and promotional value.
Description
Technical field
The present invention relates to electronic equipment PCB technical field, the particularly filtering of electronic equipment, shielding, grounding technology field, particularly relate to a kind of home gateway class communication terminal by the method for adjustment of radiation-emitting harassing and wrecking test.
Background technology
Along with entering 21 century, the electromagnetic environment gone from bad to worse is the matter of utmost importance that must solve, especially terminal called product class is led in family, large-scale outdoor communication product is generally metal shell, it is better that capability of electromagnetic shielding does, and due to the non-metal shell that cost control uses on this home gateway communication class product, equipment do not arrange Special grounding, do not have shielded performance, good principle diagram design and PCB design can only be leaned on.
The main cause that home gateway class communication terminal device does not pass through in EMC emission test is the cabling situation of the various chip CLK (clock) on veneer, there is the serious precipitous control situation of wearing layer and CLK rising edge, the filter design of Switching Power Supply, the particularly filter design of network transformer and the layout of VOIP voice call, these impacts make radiation-emitting there is very serious problem, are the reasons causing finally not meeting testing standard.
Especially reducing costs now use is much all the age do not consider the chip that EMC designs very early, and chip inherently brings out very large noise.The major part communication terminal company network transformer that all use cost is cheap, eliminate the self coupling coil in network transformer, employ poor co-mode coil, the leakage inductances of some network transformers etc. are all very serious, the LAN mouth made through netting twine bring out common-mode noise very large, this is very serious radiation emissions problem.
Summary of the invention
The object of the present invention is to provide a kind of home gateway class communication terminal not by the method for adjustment of radiation-emitting harassing and wrecking test, solving existing home gateway class communication terminal when not increasing equipment and cost, being not easy the problem by radiation-emitting harassing and wrecking experiment.
For solving the problem, the technical solution used in the present invention is:
Home gateway class communication terminal by a method of adjustment for radiation-emitting harassing and wrecking test, not is characterized in that: comprise the following steps:
Step one, when carrying out radiation-emitting harassing and wrecking test, first the grade whether equipment is required by radiation-emitting harassing and wrecking is checked, the master gauge locking equipment inside sources frequency of described radiation-emitting harassing and wrecking test only proceeds to 1GHZ when measuring lower than 108MHZ, 108M-500MHZ then measures 2GHZ, and home gateway communication terminal inside sources frequency is at 108MHZ-500MHZ;
Step 2, if radiation-emitting harassing and wrecking test is not passed through, check it is that antenna horizontal checkout is not passed through, or antennas orthogonal test is not passed through;
Step 3, analyzing noise is by veneer internal radiation out, or by signaling interface tape out;
Step 4, for veneer internal radiation situation out, final employing Adjusted Option 1, Adjusted Option 2 and Adjusted Option 3, for signaling interface tape situation out, final employing Adjusted Option 4, Adjusted Option 5 and Adjusted Option 6;
Described Adjusted Option 1: the harmonic wave of the 125M frequency multiplication that PHY produces is processed, check the filter design of PHY power supply, with magnetic bead, the analog power of PHY and digital power are isolated, prevent noise from conducting, filtering reinforcement is carried out to the power supply that PHY uses, use the electric capacity that 0.1UF-10UF does not wait, adjustment process is carried out to the CLK that PHY communicates with MAC, by RX_CLK (receive clock), TX_CLK (tranmitting data register) carries out resistors match, and resistance is between 49.9 ohm and 100 ohm;
Described Adjusted Option 2: the harmonic wave of 480M frequency multiplication is processed, because 480M can determine to be caused by USB interface, directly check placement-and-routing's situation of USB, whether USB difference cabling (for carrying a pair cabling that differential signal holds in USB) is selected in suitable layer, avoid cutting a layer cabling, checking whether the differential lines of USB is walked causes signal with reference to not enough in board edge, and cabling is arranged on more than 100mil in plate;
Described Adjusted Option 3: the envelope that frequency is caused by power supply between 30M-100MHZ is suppressed;
Described Adjusted Option 4: to the adjustment of RJ45 network interface BOB SIMITH circuit, remove the high-voltage capacitance of SIMITH circuit, the resistance value of adjustment SIMITH circuit, or whole removal SIMITH circuit, to the adjustment of network transformer center tap filter capacitor, the network interface of 100M/1000M, the patch capacitor that tap is adjusted to 1NF and 100NF is in parallel;
Described Adjusted Option 5: process the noise being coupled to VOIP by network interface partial noise;
Described Adjusted Option 6: refer to the radiated noise suppressing 12V input line brings out.
Further technical scheme is, described home gateway class communication terminal refers to the frequency between 30-230MHZ in 10 meters of darkrooms by radiation-emitting harassing and wrecking test, quasi-peak value at 30db (uv/m) below, frequency between 230-1000MHZ, the AV value that quasi-peak value records below and at 1GHZ-3GHZ at 37db (uv/m) at 50db (uv/m) below, at 70db (uv/m) below, what the data recorded like this were passed through is CLASS B grade to PK value.
A kind of home gateway class communication terminal according to claim 1 is not by the method for adjustment of radiation-emitting harassing and wrecking test, and it is characterized in that: in described Adjusted Option 1, the build-out resistor of the upper use of described RX_CLK, TX_CLK is 49.9 ohm-150 ohm.
In described Adjusted Option 4, network transformer center tap is the filter capacitor of the parallel combination of a pair 1NF and 100NF.
The beneficial effect adopting technique scheme to produce is:
1, do not change framework and the structure of home gateway class communication terminal device circuit.
2, improve the research and development speed of electronic equipment fast, make equipment by radiation-emitting harassing and wrecking test as soon as possible.
3, the significant radiation-emitting harassing and wrecking percent of pass improving home gateway class communication terminal device.
4, easy, feasible, to reduce home gateway class communication terminal R&D costs, have good cost performance and promotional value.
Accompanying drawing explanation
Fig. 1 is that a kind of home gateway class of the present invention communication terminal is not by the logic diagram of a method of adjustment embodiment of radiation-emitting harassing and wrecking test.
Fig. 2 is the circuit diagram of Adjusted Option 1.
Fig. 3 is the circuit diagram of Adjusted Option 2.
Fig. 4 is the circuit diagram of Adjusted Option 3.
Fig. 5 is the circuit diagram of Adjusted Option 4.
Fig. 6 is the circuit diagram of Adjusted Option 5.
Fig. 7 is the circuit diagram of Adjusted Option 6.
Embodiment
In order to make object of the present invention, technical scheme and advantage clearly understand, below in conjunction with drawings and Examples, the present invention is further elaborated.Should be appreciated that specific embodiment described herein only in order to explain the present invention, be not intended to limit the present invention.
Radiation-emitting harassing and wrecking test is according to GB 9254 " the radio disturbance limit value of Information Technology Equipment and measuring method ", master gauge locking equipment inside sources frequency only proceeds to 1GHZ when measuring lower than 108MHZ, 108M-500MHZ then measures 2GHZ, home gateway class communication terminal inside sources frequency is generally all greater than 108MHZ and is less than 500MHZ, so described home gateway class communication terminal refers to the frequency between 30-230MHZ in 10 meters of darkrooms by radiation-emitting harassing and wrecking test, quasi-peak value at 30db (uv/m) below, between the frequency of 230-1000MHZ, quasi-peak value at 37db (uv/m) below.1GHZ-3GHZ be AV value 50db (uv/m) below, at 70db (uv/m) below, what pass through is CLASS B grade to PK value.
Fig. 1 shows home gateway class communication terminal of the present invention not by an embodiment of the method for adjustment of radiation-emitting harassing and wrecking test:
Home gateway class communication terminal by a method of adjustment for radiation-emitting harassing and wrecking test, does not comprise the following steps:
As shown in Figure 2: step one, when carrying out radiation-emitting harassing and wrecking test, first the grade whether equipment is required by radiation-emitting harassing and wrecking is checked, the master gauge locking equipment inside sources frequency of described radiation-emitting harassing and wrecking test only proceeds to 1GHZ when measuring lower than 108MHZ, 108M-500MHZ then measures 2GHZ, and home gateway communication terminal inside sources frequency is at 108MHZ-500MHZ;
Step 2, if radiation-emitting harassing and wrecking test is not passed through, check it is that antenna horizontal checkout is not passed through, or antennas orthogonal test is not passed through;
Step 3, analyzing noise is by veneer internal radiation out, or by signaling interface tape out;
Step 4, for veneer internal radiation situation out, final employing Adjusted Option 1, Adjusted Option 2 and Adjusted Option 3, for by signaling interface tape situation out, finally adopt Adjusted Option 4, Adjusted Option 5 and Adjusted Option 6;
As shown in Figure 2, described Adjusted Option 1: the harmonic wave of the 125M frequency multiplication that PHY produces is processed, check the filter design of PHY power supply, with magnetic bead, the analog power of PHY and digital power are isolated, prevent noise from conducting, filtering reinforcement is carried out to the power supply that PHY uses, use the electric capacity that 0.1UF-10UF does not wait, preferred 0.1UF, 1UF, each 2 of 10UF electric capacity, adjustment process is carried out to the CLK that PHY communicates with MAC, by RX_CLK, TX_CLK carries out resistors match, resistance is between 49.9 ohm and 100 ohm, preferably the best of 75 ohm, 150 ohm can be adjusted to when not affecting signal integrity for plank poor individually, prevent CLK rising edge too fast, the harmonic ratio that overshoot causes too is greatly abundanter, also can adjust the operating voltage of indivedual PHY chip, as can under the normal work prerequisite of PHY, the voltage swing that suitable reduction PHY chip uses, reduce PHY internal operating current, thus reduce the external radiation of noise on CLK,
As shown in Figure 3, described Adjusted Option 2: the harmonic wave of 480M frequency multiplication is processed, because 480M can determine to be caused by USB interface, directly check placement-and-routing's situation of USB, whether USB difference cabling is selected in suitable layer, avoid cutting a layer cabling, checking whether the differential lines of USB is walked causes signal with reference to not enough in board edge, cabling is arranged on more than 100mil in plate, differential lines adds clock matches resistance, part on common mode inductance reserved in differential lines, the bag ground punching of differential lines has not evenly;
As shown in Figure 4, described Adjusted Option 3: the envelope that frequency is caused by power supply between 30M-100MHZ is suppressed, magnetic bead size is preferably 100M, the specification of 600 ohm, on veneer, 12V input adds common mode inductance, adds several filter capacitor being greater than about 220UF; Turn 3.3V at 12V, the voltage change-over switch chips such as 1.8V export and input pin adds magnetic bead;
As shown in Figure 5, described Adjusted Option 4: to the adjustment of RJ45 network interface BOB SIMITH circuit, remove the high-voltage capacitance of SIMITH circuit, the resistance value of adjustment SIMITH circuit, or whole removal SIMITH circuit, to the adjustment of network transformer center tap filter capacitor, the network interface of 100M/1000M, the patch capacitor that tap is adjusted to 1NF and 100NF is in parallel, both sides can be used to have the network transformer of COMON CHOKE to voltage driven type PHY, or three-terminal network transformer, the common mode radiation that network transformer with self coupling coil can well suppress network interface to bring out.In addition when not considering cost, the magnet ring that size is suitable can be added on netting twine.
As shown in Figure 6, described Adjusted Option 5: process the noise being coupled to VOIP by network interface partial noise, because plank size is controlled, it is very little that general home gateway class communication terminal plank all does, that leans between several interface is very near, especially the RJ11 interface of VOIP and the RJ45 interface of network interface lean on very near; Due to the interference of Earth noise near the leakage inductance of network transformer and network interface, easily make VOIP phone take a part of radiated noise out of, the network interface SIMITH circuit high-voltage capacitance removing the vicinity of VOIP effectively can reduce network interface and be coupled to the interference of VOIP;
As shown in Figure 7, described Adjusted Option 6: suppress the radiated noise that 12V input line brings out, the preferred 25mH of common mode inductance value, because home gateway class communication terminal is with regard to a 12V input port, may to be coupled the noise that a part of chip brings in the cabling situation that plank is inner complicated, radiate from 12V input line, at this time again 12V input power cord can add upper magnetic ring, or add that common mode inductance effectively can solve the radiation-induced radiation of power lead and exceed standard in 12V input.
According to home gateway class communication terminal of the present invention not by another embodiment of the method for adjustment of radiation-emitting harassing and wrecking test, described home gateway class communication terminal refers to the frequency between 30-230MHZ in 10 meters of darkrooms by radiation-emitting harassing and wrecking test, quasi-peak value at 30db (uv/m) below, frequency between 230-1000MHZ, the AV value that quasi-peak value records below and at 1GHZ-3GHZ at 37db (uv/m) at 50db (uv/m) below, at 70db (uv/m) below, what the data recorded like this were passed through is CLASS B grade to PK value.
According to home gateway class communication terminal of the present invention not by another embodiment of the method for adjustment of radiation-emitting harassing and wrecking test, in described Adjusted Option 1, the build-out resistor of the upper use of described RX_CLK, TX_CLK is 49.9 ohm-150 ohm, preferably 75 ohm.
According to home gateway class communication terminal of the present invention not by another embodiment of the method for adjustment of radiation-emitting harassing and wrecking test, in described Adjusted Option 4, network transformer center tap is the filter capacitor of the parallel combination of a pair 1NF and 100NF.
Claims (4)
1. home gateway class communication terminal is not by a method of adjustment for radiation-emitting harassing and wrecking test, it is characterized in that: comprise the following steps:
Step one, when carrying out radiation-emitting harassing and wrecking test, first the grade whether equipment is required by radiation-emitting harassing and wrecking is checked, the master gauge locking equipment inside sources frequency of described radiation-emitting harassing and wrecking test only proceeds to 1GHZ when measuring lower than 108MHZ, 108M-500MHZ then measures 2GHZ, and home gateway communication terminal inside sources frequency is at 108MHZ-500MHZ;
Step 2, if radiation-emitting harassing and wrecking test is not passed through, check it is that antenna horizontal checkout is not passed through, or antennas orthogonal test is not passed through;
Step 3, analyzing noise is by veneer internal radiation out, or by signaling interface tape out;
Step 4, for veneer internal radiation situation out, final employing Adjusted Option 1, Adjusted Option 2 and Adjusted Option 3, for signaling interface tape situation out, final employing Adjusted Option 4, Adjusted Option 5 and Adjusted Option 6;
Described Adjusted Option 1: the harmonic wave of the 125M frequency multiplication that PHY produces is processed, check the filter design of PHY power supply, with magnetic bead, the analog power of PHY and digital power are isolated, prevent noise from conducting, filtering reinforcement is carried out to the power supply that PHY uses, use the electric capacity that 0.1UF-10UF does not wait, adjustment process is carried out to the CLK that PHY communicates with MAC, RX_CLK, TX_CLK are carried out resistors match, and resistance is between 49.9 ohm and 150 ohm;
Described Adjusted Option 2: the harmonic wave of 480M frequency multiplication is processed, because 480M can determine to be caused by USB interface, directly check placement-and-routing's situation of USB, whether USB difference cabling is selected in suitable layer, avoid cutting a layer cabling, checking whether the differential lines of USB is walked causes signal with reference to not enough in board edge, and cabling is arranged on more than 100mil in plate;
Described Adjusted Option 3: the envelope caused by power supply between 30M-100MHZ frequency is suppressed;
Described Adjusted Option 4: to the adjustment of RJ45 network interface BOB SIMITH circuit, remove the high-voltage capacitance of SIMITH circuit, the resistance value of adjustment SIMITH circuit, or whole removal SIMITH circuit, to the adjustment of network transformer center tap filter capacitor, the network interface of 100M/1000M, the patch capacitor that tap is adjusted to 1NF and 100NF is in parallel;
Described Adjusted Option 5: process the noise being coupled to VOIP by network interface partial noise;
Described Adjusted Option 6: suppress the radiated noise that 12V input line brings out.
2. a kind of home gateway class communication terminal according to claim 1 is not by the method for adjustment of radiation-emitting harassing and wrecking test, it is characterized in that: described home gateway class communication terminal refers to the frequency between 30-230MHZ in 10 meters of darkrooms by radiation-emitting harassing and wrecking test, quasi-peak value at 30db (uv/m) below, frequency between 230-1000MHZ, the AV value that quasi-peak value records below and at 1GHZ-3GHZ at 37db (uv/m) at 50db (uv/m) below, PK value at 70db (uv/m) below, what the data recorded like this were passed through is CLASS B grade.
3. a kind of home gateway class communication terminal according to claim 1 is not by the method for adjustment of radiation-emitting harassing and wrecking test, and it is characterized in that: in described Adjusted Option 1, the build-out resistor of the upper use of described RX_CLK, TX_CLK is 49.9 ohm-150 ohm.
4. a kind of home gateway class communication terminal according to claim 1 is not by the method for adjustment of radiation-emitting harassing and wrecking test, it is characterized in that: in described Adjusted Option 4, network transformer center tap is the filter capacitor of the parallel combination of a pair 1NF and 100NF.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN107070562A (en) * | 2017-04-10 | 2017-08-18 | 晶晨半导体(上海)有限公司 | A kind of circuit for improving network interface electromagnetic interference |
| CN107179457A (en) * | 2017-05-25 | 2017-09-19 | 上海市共进通信技术有限公司 | The method of adjustment that home gateway class communication terminal is tested by esd immunity |
| CN107741531B (en) * | 2017-09-07 | 2020-04-03 | 郑州云海信息技术有限公司 | Low-radiation processing system and testing method for server management network port |
| CN110018408B (en) * | 2019-03-22 | 2021-06-25 | 太仓市同维电子有限公司 | Adjusting method for failure of home gateway type communication terminal to pass conducted disturbance test |
| CN112083245B (en) * | 2020-09-09 | 2022-02-25 | 广州云从洪荒智能科技有限公司 | Target object electromagnetic radiation disturbance testing method, system, equipment and medium |
| CN112866837B (en) * | 2020-12-31 | 2021-10-26 | 广州芯德通信科技股份有限公司 | Network port radiation suppression circuit for OLT equipment and design method |
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| JP4299641B2 (en) * | 2003-11-17 | 2009-07-22 | 株式会社日立コミュニケーションテクノロジー | Radio base station test method and test apparatus |
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| CN102469472A (en) * | 2010-11-03 | 2012-05-23 | 北京京东方光电科技有限公司 | WWAN test method and test system thereof |
| CN102571218B (en) * | 2010-12-10 | 2013-10-09 | 上海卫星工程研究所 | Whole-satellite wireless testing method for a satellite-borne rotatable radio-frequency emission system |
| CN202487869U (en) * | 2012-03-22 | 2012-10-10 | 上海市共进通信技术有限公司 | Electronic device interface with low radiation emission level |
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