电子信息专业英语.ppt

《电子信息专业英语.ppt》由会员上传分享，免费在线阅读，更多相关内容在教育资源-天天文库。

1、TEXTTOURHowDoesaLogicGateinaMicrochipWork?Agateseemslikeadevicethatmustswingopenandclosed,yetmicrochipsareetchedontosiliconwafersthathavenomovingparts.Sohowcanthegateopenandclose?1-2Howdoesalogicgateinamicrochipwork?（片子上的逻辑门如何工作的）1、LarryWissel,ASICApplicationsEngineeratIBMMicroel

2、ectronics,replies:2、TakNingoftheIBMT.J.WatsonResearchCenteraddssomecomplementarydetails:3、What'saMOSFET?Inacomputer,agatecontrolstheflowofelectriccurrentthroughacircuit.Thegateconsistsoftransistors.在电脑中，门控制着通过电路的电流。门电路由晶体管组成.1、LarryWissel,ASICApplicationsEngineeratIBMMicroelectro

3、nics,replies:Thetransistorsareselectedbythechipdesignerfromtwobasictypes:PMOSandNMOStransistorsthatarefoundintheubiquitousCMOS(complementarymetal-oxidesemiconductor)technology.而这些晶体管是由芯片的设计者从广泛使用的CMOS（互补金属氧化物半导体）技术中出现的两种基本类型的晶体管（PMOS晶体管和NMOS晶体管）选择确定的。Thecurrentthatflowsthroughaga

4、teestablishesavoltageataparticularpointinthecircuit.Thisvoltagerepresentsasingle'bit'ofinformation.Thevoltagemayeitherbehigh(representingthevalue'1’)orlow(representingthevalue'0')."通过一个门的电流在电路的特定的点确立一个电压.这个电压代表一比特的信息，该电压可以为高电平（1），也可以为低电平（0）。Howtoestablisha1ora0onacircuit:Toestabl

5、isha1onacircuit:Thecurrentflowissteeredtothecircuit(controlled)by'turningon'aPMOStransistorconnectedbetweenthecircuitandthepositivesupplyvoltage.电流被驱动送到一个电路上，是通过“接通”一个连接该电路点和正向电源电压的PMOS管来控制的.Fortheverybriefintervalthatisrequiredforalogicgatetoswitch,currentwillflowthroughaPMOStra

6、nsistorfromthepositivepowersupplytothecircuit."对于逻辑门切换状态所需的非常短的时间段，电流将从电源正极流经PMOS管到达该电路点。Toestablisha0onacircuit:Thecurrentflowissteeredawayfromthecircuitthroughadifferentkindoftransistor(NMOS)connectedbetweenthecircuitandthenegativesupplyvoltage,orelectricalground.电路上的“0”值的确立是通过

7、另一种连接该电路点和负极电压或接地的晶体管（NMOS）来实现的。CurrentwillflowthroughtheNMOStransistorforaverybriefinterval.ButfortheNMOSthecurrentisbetweenthecircuitandthenegativesupply.在一个很短暂的时间间隔里，电流经过NMOS晶体管，但对于NMOS来说，电流是在该电路点和电源负极间流动的。Ineithercase,thecurrentflowresultsinachangeinthecircuitvoltagethatrepre

8、sentsabitofinformation.So,whenagateiscon