简介:UltraWideBand(UWB)transmissionsareattractiveforlowpower,basebandasynchronousmultipleaccessandpeer-to-peerwirelesscommunications.MultipleInputMultipleOutput(MIMO)technologyisusefulincombatingagainstmultipathandatthesametimeimprovessystemperformancebyusingmultielementantennasatbothtransmitterandreceiver.ThisletterproposesatimehoppingM-aryUWBsystemsusingV-BLASTalgorithm,andpowercontrolisconsideredforbetterperformance.Simulationsareprovidedtocompareperformancewithdifferentantennas.
简介:AnexperimentalwayforthethermalcharacterizationofsemiconductorlasersbasedonI-Vmethodunderpulsedrivingconditionshasbeendeveloped,withwhichthethermalcharacteristicsofstraincompensated1.3μmInAsP/InGaAsPridgewaveguideMQWlaserchipshavebeeninvestigated.Theresultsshowthat,bymeasuringandanalyzingtheI-Vcharacteristicsunderappropriatepulsedrivingconditionsatdifferentheatsinktemperatures,thethermalresistanceofthelaserdiodescouldbeeasilydeduced.Thedrivingcurrentandjunctionvoltagewaveformsofthelaserchipsunderdifferentpulsedrivingconditionsarealsodiscussed.
简介:凌特公司(LinearTechnology)推出两款高速运算放大器产品系列。这些器件比同类产品消耗的功率低50%,同时具有超低噪声性能、轨至轨输出和完全可在3.3V下工作。LT6230/1/2与LT6233/4/5放大器的综合特征非常适合仪器、通信与医疗设备领域中的有源滤波器设计和A/D转换器的驱动。
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简介:跟踪IGBT芯片能够在高达175℃的温度下工作这一最新发展趁势,已经研制出有相同工作结温的续流二极管和整流二极管。三种类型的芯片全部封装到CIB(整流-逆变-制动斩波)模块(MiniSKiiP的第二代产品)中,导致了较高的电流密度,在过载和动态负载条件下有十分可观的余量,而且也改善了功率循环能力。