RJ45互连信号性时域仿真分析.pdfVIP

RJ45InterconnectSignalIntegrity

ThisworkwasperformedbyNorthEastSystemsAssociates(NESA),aconsultingfirmwithexpertiseinhighperformance

engineeringanddesign,.

STEPfioftheRJ45maleandfemaleconnectorswereimportedintoCSTMWS.Thisconnectorhas4differentialpairs,for

eachofthepairsdiscreteportswereused.Simulationsareperformedinthetimedomain,lookingattimedomainreflectionand

transmission.Figures1and2showthemaleandfemaleportsoftheRJ45connector.

Figure1:RJ45Plugdiscreteports

Figure2:RJ45Jackdiscreteports

AtimedomainsimulationwasperformedinMicrowaveStudio,launchingtheTDRexcitationattheplugendoftheconnector.

RJ45互连信号完整性

这项工作由NorthEastSystemsAssociates(NESA)执行，这是一家在高性能工程和设计方面拥有专业知识的公司，

。

RJ45和母头连接器的STEP文件已导入到CSTMWS中。该连接器有4个差分对，每对都使用离散端口。仿真是在时域中进

行的，着眼于时域反射和传输。图1和图2显示了RJ45连接器的公口和母口端口。

图1：RJ45插头离散端口

图2：RJ45插孔离散端口

时域仿真在MicrowaveStudio中执行，在连接器的插头端启动TDR激励。

Figure3showstheTDRprofileofthe4connectorpairs.Port3(wires3-6)hasmoreinductanceandalargerdiscontinuitythan

theotherports.ThereasonforthisisthatthewiresinPort3areuncoupledwithintheconnector,cedoutsidethePort5pins

(seeFigure1).

Figure4disysthemeasuredTDRprofileofthisconnector.

Figure3:SimulatedTDRwaveforms

Figure4:MeasuredTDRwaveforms

BoththemeasurementsandsimulationsshowthedifferenceweenthePort3pairandt