简介：WirelessM-BusaccordingtoEN-13757-4isamajorcontenderforlocalmetrologicalnetwork(LMN)insmartmeteringandsmartgridapplications,asitholdsthepromiseofflexibleandoptimizedsolutions.ItenjoyswidepopularityincontinentalEurope,butincreasinglyinmanyotherregionsoftheworld.However,WirelessM-Busischaracterizedbyawidevarietyofdifferentoperationmodes(C-,F-,N-,P-,Q-,R-,S-,andT-modes),whichworkindifferentfrequencybands(i.e.,868MHz,433MHz,and169MHz).Itsapplicationlayercanbeenhancedbyextensions,beingdefinedfromvendoralliances,liketheOpenMeteringSystem(OMS)Group,orfromnationalbodies.Thiscontributiondescribesrequirements,designtechniques,andexperiencesfromthedevelopmentofhighlyefficientWirelessM-Busprotocolstacks,whichalsosupportgoodflexibility,efficiency,andportabilitywithregardtomicrocontrollerandRF-transceiverplatforms.Thepresentedapproachisnotlimitedtotheuseofmodernsoftwareengineeringdesignprocesses,butalsoincludesessentialadditionalfeaturesliketestingandsimulation,aswellastoolsforcommissioningandmonitoring.

简介：2月23日消息，法国总统奥朗德表示，法国政府争取在未来10年内让每一个家庭拥有高速宽带连接，到2017年底约50％拥有超高速宽带连接。奥朗德表示，该宽带计划还将直接创造1万个就业职位。

简介：Thestabilityofthedrivecurrentisveryimportantforalaserdriver,whileitisdifficulttomaintainthecurrentstableatahighvalueforthelaserdriver.Ontheotherhand,therangeofthedrivecurrentisexpectedtobeaswideaspossibletobeappliedtodifferentkindsoflasers.Inthispaper,ahighcurrentlaserdriverforthesuperluminescentlightemittingdiode(SLED)ispresented,whichisusedintheopticfibergyroembeddedbya0.35mbipolarcomplementarymetal-oxide-semiconductortransistor(BiCMOS)process.Thelaserdriverprovidesautomaticpowercontrolandcertainvalueofcurrentdeterminedbytheexternalresister.Thesystemisbasedontheoptic-electricfeedbacktheoryandusestheclosed-loopcontroltechniquetomaintainthedrivecurrentstable.Thesystemiscapableofproducingstablecurrentrangesfrom4mAto200mAwhenthevalueofexternalresisterchanges.