Lesson 14 Spectrum Analyzers电子技术专业英语教程

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1、Lesson4DiodeUnit2Semiconductordevice《电子技术专业英语教程》冯新宇主编电子工业出版社www.phei.com.cnLesson4DiodeBackgroundsTexttourLanguageinuseVocabularyStructureReading/writingtechniques7/19/20212《电子技术专业英语教程》TerminologythresholdvoltageDepletionregionHistoryofdiodeSomediodesymbolsBackgrounds7/19/20213《电子技术专业英语教程》Termino

2、logy7/19/20214《电子技术专业英语教程》forward-biase正向偏置voltagedrop压降depletionregion耗尽层boltzmann’sconstant玻耳兹曼常数emissioncoefficient发射系数thermalvoltage热电压roomtemperature室温7/19/20215《电子技术专业英语教程》leakagecurrent漏电流peakinversevoltage峰值反向电压Schottkydiode肖特基二极管minoritycarrier少数载流子heterojunctiondiode异质结二极管homojunctiondi

3、ode同质结二极管thresholdvoltage阈值电压7/19/20216《电子技术专业英语教程》ThresholdvoltageThethresholdvoltageofaMOSFETisusuallydefinedasthegatevoltagewhereaninversionlayerformsattheinterfacebetweentheinsulatinglayer(oxide)andthesubstrate(body)ofthetransistor.7/19/20217《电子技术专业英语教程》DepletionregionInsemiconductorphysics,t

4、hedepletionregion,alsocalleddepletionlayer,depletionzone,junctionregionorthespacechargeregion,isaninsulatingregionwithinaconductive,dopedsemiconductormaterialwherethechargecarriershavediffusedaway,orhavebeenforcedawaybyanelectricfield.Thedepletionregionissonamedbecauseitisformedfromaconductingreg

5、ionbyremovalofallfreechargecarriers,leavingnonetocarryacurrent.Understandingthedepletionregioniskeytoexplainingmodernsemiconductorelectronics:diodes,bipolarjunctiontransistors,field-effecttransistors,andvariablecapacitancediodesallrelyondepletionregionphenomena.7/19/20218《电子技术专业英语教程》Historyofdiod

6、eAlthoughthecrystal(solidstate)diodewaspopularizedbeforethethermionicdiode,thermionicandsolidstatediodesweredevelopedinparallel.ThebasicprincipleofoperationofthermionicdiodeswasdiscoveredbyFrederickGuthriein1873.Guthriediscoveredthatapositively-chargedelectroscopecouldbedischargedbybringingagroun

7、dedpieceofwhite-hotmetalclosetoit(butnotactuallytouchingit).Thesamedidnotapplytoanegativelychargedelectroscope,indicatingthatthecurrentflowwasonlypossibleinonedirection.TheprinciplewasindependentlyrediscoveredbyThomasE