电子信息专业英语(7)

《电子信息专业英语(7)》由会员上传分享，免费在线阅读，更多相关内容在学术论文-天天文库。

1、UnitTwoAnalogCircuitNewWordsandExpressionsdiode['daiəud]二极管nonlinear[nɔn'liniə]非线性one-way单向的valve[vælv]阀门semiconductor[ˌsemikən'dɔktə]半导体schematic[ski:'mætik]原理图symbol['simbəl]图表arrows箭头battery['bætəri]电源lamp[læmp]灯permit[pə'mit]准许prohibit[prəu'hibit]禁

2、止polarity[pəu'lærəti]极性Conversely相反switch[switʃ]开关oddly['ɔdli]奇怪地invent发明predominantly占主导地位的conventional[kən'venʃənəl]习惯的、传统的notation[nəu'teiʃən]符号、标记metallurgically[ˌmelə'lə:dʒikli]冶金silicon['silikən]硅n-typeN型p-typeP型juxtaposed[ˌdʒʌkstə'pəuzd]紧靠的ohmme

3、ter['əumˌmi:tə]欧姆表qualitatively['kwɔlitətivli]定性地purpose目的expect期望military['militəri]军用civilian[si'viljən]民用peak[pi:k]峰值clamper['klæmpə]钳子rectification整流photic['fəutik]光decoration[ˌdekə'reiʃən]装潢、装饰TextDiodeAdiodeisanonlinearelectricaldeviceallowingcur

4、renttomovethroughitinonedirectionwithfargreatereasethanintheotherandusuallyactingasaone-wayvalveforcurrent.Themostcommonkindofdiodeinmoderncircuitdesignisthesemiconductordiode,althoughotherdiodetechnologiesexist.Semiconductordiodesaresymbolizedinschema

5、ticdiagramssuchasFig.2-1.InFig.2-1,arrowsindicatethedirectionofelectroncurrentflow.Whenplacedinasimplebattery-lampcircuit,thediodewilleitheralloworpreventcurrentthroughthelamp,dependingonthepolarityoftheappliedvoltage.(Fig.2-2)(a)Currentflowispermitted

6、;thediodeisforwardbiased.(b)Currentflowisprohibited;thediodeisreversedbiased.Whenthepolarityofthebatteryissuchthatelectronsareallowedtoflowthroughthediode,thediodeissaidtobeforward-biased.Conversely,whenthebatteryis“backward”andthediodeblockscurrent,th

7、ediodeissaidtobereverse-biased.Adiodemaybethoughtofaslikeaswitch:“closed”whenforward-biasedand“open”whenreverse-biased.Oddlyenough,thedirectionofthediodesymbol's“arrowhead”pointsagainstthedirectionofelectronflow.Thisisbecausethediodesymbolwasinventedby

8、engineers,whopredominantlyuseconventionalflownotationintheirschematics,showingcurrentasaflowofchargefromthepositive(+)sideofthevoltagesourcetothenegative(-).Thisconventionholdstrueforallsemiconductorsymbolspossessing“arrowheads”.Thearro