网络连接器高频参数测试方法及原理.docx

Title of DOC.文件名称：网络连接器咼频参数测试方法及原理DOC No.文件编号：|— First edi tion 初次发放阳 Change更改Effective date: 生效日期：Page No.：页码：第1页，共20页Reason for change 更改依据：根据质量手册，文件及资料控制程序Brief Description of Change 更改内容简述： 统一文件格式Version Memorandum 版本备忘记录版本/修订Ver/Rev更改页码Change Page日期Date累计页数Accumulation page制定者Prepare版本/修订Ver/Rev更改页码Change Page日期Date累计页数Accumulation page制定者PrepareA/0—20Prepared by 制定： Checked by 审核： Approved by 批准：相关单位会签（三级文件无需会签）市场部物料部计划部工程部质量部生产部行政部人力资源部研发部管理层文件发放部门（请在下面表格内填写发放部门，此栏由文件制作部门填写）□市场部□物料部□工程部□计划部□质量部□生产咅13□行政部□人力资源部□研发部□管理层□其它Titie标题：网络连接器高频参数测试方法及原理生效日期EffectiveDa te版本/修订Rev/Ver页码Page文件编号Doc. No.2020-6-13A/0第2页，共20页INSERTION LOSS (IL), RETURN LOSS (RL), NEAR END CROSSTALK NOISE REJECTION (NEXT), DIFFERENTIAL-MODE TO COMMON-MODE, AND COMMON MODE TO COMMON MODE NOISE REJECTION TEST PROCEDURE FOR LAN MAGNETICS 网络连接器的插入损耗、反射损耗、近端串扰噪声抑制、共模与差模的转换、共模噪声抑制的测试程 序1. Introduction简介1.1 ScopeThis procedure applies to LAN Magnetics, such as discrete, RJ45 electrical connectors.1.1适用范围这个测试程序适用于网络连接器。

例如：变压器，共模扼流圈，RJ45电子连接器1.2 ObjectThis standard describes test methods to measure IL, RL, Near-End Crosstalk, DM TO CM and CM TO CM in the frequency domains. It is designed to serve the public interest through eliminating misunderstandings between designers, producers and inspectors, facilitating interchangeability and improvement of products.1.2目的这个文件讲叙了在频域内插入损耗、反射损耗、近端串扰、共模与差模的转换及共模抑制的测试方法，以 便设计者、生产者和检验者更好的相互了解，从而达到更快更好的改善和改良产品的目的1.3 Defi nitions定义1.3.1 Stimulus signal 激励源(信号源)With the frequency domain method, the stimulus signal is sinusoidal. 用频域分析法，激励源是正弦曲线。

1.3.2 Common Mode Impedance (Z)The impedance measured bet ween the inpu t and the output of a net work. This is measured with all the inputs shorted and all the outputs shorted. This CM impedance reduces the noise energy that causes EMI. The resulting impedance in the signal path should not modify the signal.1.3.2共模阻抗共模阻抗是指一个网络输入与输出之间的阻抗，测试时需将所有的输入输出分别短路共模阻抗 能够减弱引起电磁干扰的噪声在信号传输路径上产生的阻抗不应该影响这个信号1.3.3 Common Mode SignalThe signal that is in phase on both signal lines. This results in EMI. EMI can either be radiated or conducted (into the power line). Common mode signals in digital terminal equipment are created by imbalances in the signal transmission or in the conversion of differential mode signals by impedance mismatches.1.3.3共模信号共模信号是指在两输入端输入极性相同的信号。

共模信号将导致电磁干扰电磁干扰分为辐射干 扰和传导干扰(进入电源线内)信号传输不对称和阻抗不匹配时差模信号转换都将产生数字终端 设备的共模信号1.3.4 Differential Mode SignalThe data that is being sent. These signals are of equal amplitude and out of phase, thus no radiation occurs.1.3.4差模信号 差模信号是指在两输入端输入大小相等极性相反的信号，它不会产生辐射1.3.5 Electro Magnetic Interference (EMI)EMI represents unwanted signals that are radiated or conducted to susceptible signal paths thus interfering with the proper function and performance of the transmission. 1.3.5电磁干扰电磁干扰是指无用信号辐射或传导至敏感的信道，从而引起传播信道的功能和性能的下降。

1.3.6 Insertion LossInsertion loss is the decrease in power delivered to the load when a filter is inserted between the source and the load. The figure below shows the testing setup. 插入损耗 插入损耗是指一个滤波器插入在电源与负载之间时信号能量的衰减.下图显示了插入损耗测试方 法.Vout / 、IL=20lg (dB)VinHPSn 2ET/E5W1AjAg^nt 3753RFOUTJRF IN3C吕00三 o S 匚三 「二口二二 吕吕00吕1.3.7 Return LossReturn loss is a measure of dissimilarity or mismatch between a measured impedance and standard impedance, both in magnitude and phase angle. This measurement is expressed in decibels (dB). Return loss is expressed as反射损耗反射损耗是用来描述实测阻抗与标准阻抗不同或不匹配的程度，不同和不匹配既包括幅值大小的 不同又包括相位角的不同。

反射损耗的单位是分贝，反射损耗的表达式如下：2020-6-13版本/修订Rev/Ver页码PageA/0第4页，共20页I Zs+ Zm I A = 20109 [zSqWhere Z is the st andard impedance and Z is measured impedance. For a perfec t match,S Mthe return loss would be infinite.这里Z是指标准阻抗，Z是实测阻抗如果匹配理想，反射损耗将会无穷大S MA 二 20 log 1^211I他IHIBH*11三□n-ln 巨CZi □ [~1 □ 1=1IZZI IZZI IZZI IZZII—I 1=1 1=1 1=1H pa 713ETJE51 山怡蚀 lent 毎碍 FquatJWRFOUT RF INQ 01DQR1iXR1.3.8Cross talk (Near End Cross talk Noise Rejec tion (NEXT)串扰(近端串扰抑制)Crosstalk measures undesirable energy coupled on a signal path from another nearby signal path. The value is expressed in decibels (dB) as a ratio of coupled voltageon a susceptible cable to the voltage on a nearby source.串扰是指一个通道的无用信号耦合进邻近的信号通道。

串扰的单位是分贝，它是敏感电缆的耦 合电压与邻近干扰源电压之比2020-6-13 A/0页码Page第5页，共20页□三 口吕口兰 CWC1匚匚 口口口口三 0吕吕吕口l=l l=l l=lHP8 712gTJE5061 A/agilenr ^7S3 Eqg网目RF OUTGRF INQ1.3.9 DCMR (DM TO CM Conversion)共模与差模的转换The ratio (in dB) of the voltage required to generate a standard output from a differential balanced system, when applied between the input ports, to the voltage required to generate the same output。