标签: transmitters

Short-rangeradiosthatoperateattheIndustrial,Scientific,andMedical(ISM)frequenciesfrom260MHzto470MHzarewidelyusedforremotekeylessentry(RKE),homesecurity,andremotecontrol.Acriticalperformancemeasurementfortheradiotransmitteristhepowerthatitradiatesfromtheantenna.Thispowermustbehighenoughtomakethelinkbetweenthetransmitterandreceiverreliable,yetitmustnotbesohighthatitexceedstheradiationlimitsestablishedinPart15.231oftheFCCRegulations.ThisapplicationnotediscussestherelationshipbetweenFCCfield-strengthrequirementsinthe260MHzto470MHzfrequencyrangeandtheradiatedpowerandtypicalquantitiesmeasuredonatestreceiver.Tableswillillustratethevaluesthatadesignercanexpecttoobtaininfieldtests.……

Abstract:Theprecisioncurrentmirrorsshownallowyoutotransformonetypeof4–20mAtransmittertoanother,ortocreatearepeaterforthepurposeofextendingthelengthofthecurrentloop.Thecircuitsincludeaninput-sink/output-sinkmirrorandaninput-source/output-sourcemirror.Maxim>AppNotes>AmplifierandComparatorCircuitsKeywords:4-20mAtransmitters,precisioncurrentmirrors,current-senseresistorratiosNov11,2010APPLICATIONNOTE4508PrecisionCurrent-Sink/SourceCircuitsConfigureasMirrorsorAmplifiersAbstract:Theprecisioncurrentmirrorsshownallowyoutotransformonetypeof4……

一种类型的4–20mA发射机到另一个，或创建直放站延长当前循环的目的。电路包括一个输入接收器输出接收器的镜子和一个输入源输出源的镜子。Maxim>AppNotes>AmplifierandComparatorCircuitsKeywords:4-20mAtransmitters,precisioncurrentmirrors,current-senseresistorratiosNov11,2010APPLICATIONNOTE4508PrecisionCurrent-Sink/SourceCircuitsConfigureasMirrorsorAmplifiersAbstract:Theprecisioncurrentmirrorsshownallowyoutotransformonetypeof4……