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1、1.Thiselectronbeamsweepsacrosseachlineatauniformrate，thenfliesbacktoscananotherlinedirectlybelowthepreviousoneandsoon，untilthehorizontallinesintowhichitisdesiredtobreakorsplitthepicturehavebeenscannedinthedesiredsequence．电子束以均匀的速率扫描每一行，然后飞速返回去扫描下一行，直到把被扫描的图像按所希望的顺序分割成行
2、。2.Thetechnicalpossibilitiescouldwellexist，therefore，ofnation-wideintegratedtransmissionnetworkofhighcapacity，controlledbycomputers，interconnectedgloballybysatelliteandsubmarinecable，providingspeedyandreliablecommunicationsthroughouttheword因此，在技术上完全可能实现全国性的集成发送网络。这种网络容
3、量大，由计算机控制，并能通过卫星和海底电缆实现全球互联，提供世界范围的高速、可靠的通信。3.Transittimeistheprimaryfactorwhichlimitstheabilityofatransistortooperateathighfrequency．渡越时间是限制晶体管高频工作能力的主要因素4.Theintensityofsoundisinverselyproportionaltothesquareofthedistancemeasuredfromthesourceofthesound.声强与到声源的距离的平方成反
4、比。5.Theattenuationofthefilterisnearlyconstanttowithin0.5dBovertheentirefrequencyband． 该滤波器的衰减近于恒定,整个频带内的变化在0.5dB以内。6.Atpresent,thestateofmostsemiconductordevicetechnologyissuchthatthedevicedesignandprocesstechnologymustbesupplementedbyscreeningandinspectionprocedures,
5、ifultimatedevicereliabilityistobeobtainedandcontrolled．目前,大多数半导体器件的技术尚未十分完善,以至若要获得并控制器件最终的可靠性,就必须辅以筛选和检验,以弥补设计和工艺技术之不足7.Bandwidthoftransistoramplifiersvaryfromabout250MHzintheLbandto1000MHzintheXband．晶体管放大器的带宽在L波段约为250MHz,在X波段为1000MHz。8.Theoutputofthedifferentialamplif
6、ierisfedtothecircuit’soutputstageviaanoffset-compensationnetwork,whichcausestheop-amp’soutputtocenteratzerovolts.Theoutputstagetakestheformofacomplementaryemitterfollower,andprovidesalow-impedanceoutput.差动放大级的输出通过一个失调补偿网络与输出级相连,目的是使运放的输出以0V为中心。输出级采用互补的射极跟随器的形式以使输出阻抗很低
7、9.Becauseoftheveryhighopen-loopvoltagegainoftheop-amp,theoutputisdrivenintopositivesaturation(closeto+V)whenthesamplevoltagegoesslightlyabovethereferencevoltage,anddrivenintonegativesaturation(closeto-V)whenthesamplevoltagegoesslightlybelowthereferencevoltage.由于运放的开环电
8、压增益很高,当取样电压略高于参考电压时,输出趋向于正向饱和状态(接近+V)。当取样电压低于参考电压时,输出趋向于负向饱和状态(接近-V)。10.Ifthesignalsourceweredirectconnectedinsteadof
