简介:交流电机调速系统正向数字化方向发展,一般的微控制器无法对复杂控制算法进行运算,且32位微处理器相对比较贵。TMS320F240DSP特殊的结构设计,堪称业界最具竞争力的数字电机控制器,论文探讨了TMS320F240在交流调速系统中的应用。
简介:A320×240CMOSimagesensorisdemonstrated,whichisimplementedbyastandard0.6μm2P2MCMOSprocess.Forreducingthechiparea,each2×2-pixelblocksharesasample/holdcircuit,analog-to-digitalconverterand1-bmemory.The2×2pixelpitchhasanareaof40μm×40μmandthefillfactorisabout16%.Whileoperatingatalowframerate,thesensordissipatesaverylowpowerbypower-managementcircuitmakingpixel-levelcomparatorsinanidlestate.Adigitalcorrelateddoublesampling,whicheliminatesfixedpatternnoise,improvesSNRofthesensor,andmultiplesamplingoperationsmakethesensorhaveawidedynamicrange.
简介:ThepreparationofPT/PEK-cfilmsisreportedaswellastheirdielectricandopticalproperties.Thec-axisorientationratioofthefilmsis68%.Dielectricconstantandlossfactorat10kHzisabout4.023F/mand0.003,respectively.Therefractiveindicesofthefilms,neandno,are1.6573and1.6278at0.63μmwavelength,respectively.Theopticalband-gapofthefilmwithathicknessof2.33μmisfoundtobe3.06eV
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