电子专业英语教学课件作者高明辉第9章.ppt

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1、Warming-upI.Canyoupointoutthedifferenceofthefollowingpictures?II.Doyouknowwhatthefollowingabbreviationsorsymbolsstandfor?NPNPNPIII.TalkaboutCurrentinEnglish.Andthefollowingpatternsyoucanuse:Doyouknowthetransistor?Couldyoutellmewhodevelopedthetransistor?Unit9Transistors下一页返回Howmanyelec

2、trodearethere?Howmanytypesoftransistor?TextComprehensionTransistorAtransistorisadevicedevelopedbyDr.Wm.Shockley,Dr.JohnBardeen,andDr.WalterH.Brattain,oftheBellTelephoneLaboratories,makingfromthreelayersofsemiconductors,i.e.NPNorPNP.Thecompleteassemblyisencasedinaglassenvelopeorplastic

3、block.Atransistorcancontrolthecurrentflowingthroughit.Ithasusuallythreeelectrodes.Theelectrodesupplyingelectricalchargesistheemitter.Theelectrodecollectingthechargesemittedbytheemitteristhecollector.Thethirdisthebase.Unit9Transistors上一页下一页返回Therearethreebasicconnections:thecommon-base

4、,thecommon-emitter,andthecommon-collector,makingupvariouscircuits.Atransistorcanbeconnectedintoacircuitinanyoneofthethreeways,dependingonthetypeofoperationrequired.Knowingthebasicconnections,wecaneasilyunderstandallothercircuits.Transistorsareusedforamplifying,detecting,rectifying.Osc

5、illationandmanyotherservicesperformedbyvacuumtubes.Theword“transistor”iscoinedfromthetwowords“transfer”and“resistor”.Therearetwotypesoftransistors:thejunctionandpoint-contacttypes.Transistorsdon’trequirefilamentorheaterelementsandarereadytofunctionwhentheinstantvoltageisappliedtothem.

6、Operatingvoltagesrangefrom1.5to30voltsDCformostapplications,consumingonlyafewmilliamperesofcurrent.Unit9Transistors上一页下一页返回Vocabulartransistorn.晶体管assemblyn.装配，装置electroden.电极collectorn.集电极emittern.发射极amplifyv.放大oscillationn.震荡，震动vacuumn.真空，真空状态coinv.创造filamentn.细线instantadj.瞬间的Unit9T

7、ransistors上一页下一页返回Phrasesandexpressionselectricalcharge电子电荷common-base共基极common-emitter共发射极common-collector共集电极Notes1.“Atransistorcanbe…operationrequired.”中“dependingon…required”引导的是状语从句。2.“Theelectrodecollectingthecharge…collector”中“collectingthecharge”是现在分词短语做“theelectrode”的后置定语。ICh

8、ooset