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ID:39502015
大小:22.67 KB
页数:7页
时间:2019-07-04
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1、1.理想的调制方法(modulationscheme)与现有方法相比具有带宽(bandwidth)小,实现简单,成本低和误码率(errorrate)低的优点。Idealmodulationschemeshavetheadvantageovernowexistedmethodsofnarrowbandwidth,simplerealization,lowcostsand2.晶体管transistor确实能放大信号,但它究竟能放大信号多少倍取决于该晶体管类型。Transistorcanmagnifysignalsind
2、eed,buthowmanytimesitcandodependsonitstype.3.在基极(base)接地的情况下,Q5的阻抗(impedance)很高。Withthebasegrounded,theimpedanceofQ5islarge.4.为了让读者更好地理解通讯系统,就必须对信息论informationtheory有深入的了解。Inorderforthereaderstoknowtelecommunicationsystembetter,wemusthaveadeepunderstandingofin
3、formationtheory.5.各种集成电路IC的产量较1998年增加了4倍。TheyieldofvariousICisfourtimesasmuchasitwasin1988.6.该芯片(dice)是直径diameter为零点零几厘米的一个小方块square。Thisdiceisasmallsquarewiththediameterofseveralhundredthscentimeters.1.传输线transmissionline屏蔽(shielding)越好,传输效果越好,传输距离就越远,这是通信常识。
4、Thefactthatthebettertheshieldingoftransmissionandtransmissioneffect,thelongerthedistanceoftransmissionisthecommonsenseintelecommunication.2.在采用这些调制modulation类型时,不论是调频(FM)、调幅(AM)、还是单边带(SSB),都需考虑带宽(bandwidth)效率和功率效率powerefficiency之间的平衡balance关系。Intakingthesetype
5、sofmodulation,whateverFM,AMorSSBitis,thebalancebetweenbandwidthefficiencyandpowerefficiencymustbetakenintoconsideration.3.银是最好的导体conductor,其次是铜copper。Silveristhebestconductor,followedbythecopper.4.像我们用来测量电压的这种仪表称为电压表voltmeter。Thisinstrumentasweusedtomeasurethe
6、voltageiscalledvoltmeter.5.圆心center在原点origin,半径radius为α的圆circle的方程为x2+y2=α2。Theequationofcirclewiththeradiusofαandwiththeoriginasitscenterisx2+y2=α2.1.一个常数constant,无论多大,都不能说成是无穷大infinity。Aconstant,howeverbigitis,can’tberegardedasinfinity.2.所谓电动势(EMF)就是指没有电流流动时
7、电池两端的电位差potentialdifference。TheEMF,aswecalled,isthepotentialdifferencebetweenthetwoendsofbatterywithoutcurrentflowingthrough.3.在所有这些蓝牙bluetooth设备中,该设备的传输速率高达每秒3Mb。Thetransmissionspeedofthisdeviceisashighas3MbpersecondinalltheseBluetoothones.4.无线wireless局域网(LAN
8、),费用较低,速度较快,现已用于家庭和公司。Lowinpriceandhighinspeed,wirelessLANhasbeenusedinfamiliesandcompanies.PartTwoMistakeCorrection(20%)UnderlinetheCorrectedPartsinyourAnswers.1.Thecapacitanceism
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