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1、Unit4OperationalAmplifier1运算放大器一.NEWWORDS21.amplifier[΄æmpli͵faiə]n.放大器，扩音器2.analogue[΄ænəlɔɡ]n.模拟adj.模拟的3.variety[və΄raiəti]n.变化,多样性,种类4.discrete[dis΄kri:t]adj.不连续的,离散的5.internal[in΄tə:nl]adj.内在的,国内的6.denote[di΄nəut]vt.指示,表示7.invert[in΄və:t]vt.使颠倒,使转化8.available[ə΄veiləbl]adj.可获得
2、的9.package[΄pækiʤ]n.包裹,包,管壳•10.pin[pin]n.钉,管脚，引线11.impedance[im΄pi:dəns]n.[电]阻抗，阻抗1.operationalamplifier运算放大器•••3invertinginputnon-invertinginput8pindual-in-line反向输入端同向输入端8管脚双列直插式二.Technicalterms:三.Expressions:4avarietyofeventhoughbeinterestedinbeknownaswithrespecttobeequalto各种各样的
3、即使对...感兴趣被称为…关于,至于等于，与…相等四.Questionsfortextdiscussion:51.Whyisoperationalamplifiergiventhename?2.Drawthecircuitsymbolofanoperationalamplifier.3.Talkabouttheapplicationoftheoperationalamplifier.Thefirstparagraph:Theoperationalamplifieristhemostimportantbasicblockofalllinearcircuits
4、.Ithasawiderangeapplicationsinsuchfieldsasanaloguesignaloperations,amplification,filtering,waveformsproducing,linearandnon-linearsignalshanding,etc.译：运算放大器是所有线性电路中最重要的基本器件。它的应用十分广泛，包括模拟信号的运算，放大，滤波，波形发生器，以及进行线性和非线性信号的处理等。6五Learnthetext:Thesecondparagraph:Theterm“operationalamplifie
5、r”wasoriginallyappliedtohighgainamplifiersoperatingdowntozerofrequencywhichwereusedinanaloguecomputerstoperformcertainmathematicaloperations.Thesehighgainamplifierarenowusedforawidevarietyofapplications,butthename“operationalamplifiers”or“op-amp”isnormallyuseeventhoughnomathematic
6、aloperationareinvolved.Theearlyoperationalamplifieremployeddiscretecomponents,butitisnowmuchmoreconvenienttoemployanintegratedcircuit.Thecircuitdesignersisnotgenerallyinterestedintheinternalcomponentsofanintegratedcircuit,butonlyintheperformanceoftheunitasawhole.Therefore,thesymbo
7、linFig.2isusedtodenotetheamplifier.Itcanbeseenthattherearetwoinputs,oneoutputandconnectionthepositiveandnegativesupplylines.7注：这里whichwereused…mathematicaloperational为定语从句，修饰前面的highgainamplifiers,因为定语从句并未直接跟在所修饰的先行次后，语法上称其为分割定语。而定语从句中的toperformcertainmathematicaloperations为动词不定式短语
8、，作目的状语。8•译：运算放大器这一术语最早适用于下限频率可低到零
