所需E币: 4
时间: 2019-12-24 17:54
大小: 27.26KB
图1电路的生产使用精确的可变频率正弦波波作为一个通用的参考信号。它包括一个8阶椭圆形,开关电容低通滤波器器(IC3)微处理器IC2产生的100kHz方波时钟。(任何其他方便的方波源也是可以接受的。)微控制器的时钟由10MHz的振荡器模块。一个电压监控器(IC1),确保在电源故障时的正确操作。IC3的设置在1/100的时钟频率,滤波器的截止频率。Maxim>AppNotes>AutomotiveFilterCircuits(Analog)SignalGenerationCircuitsKeywords:digitallycontrolledsine-wavegenerator,sinewave,circuits,IC3Jun27,2003APPLICATIONNOTE2081DigitallyControlledSine-WaveGeneratorAsimilarversionofthisarticleappearedintheMay15,2003issueofEDNmagazine.ThecircuitofFigure1producesanaccuratevariable-frequencysinewaveforuseasageneral-purposereferencesignal.Itincludesan8th-orderelliptic,switched-capacitorlowpassfilter(IC3)thatisclockedwitha100kHzsquarewavegeneratedbymicrocontrollerIC2.(Anyotherconvenientsquarewavesourceisalsoacceptable.)Themicrocontrollerisclockedbya10MHzoscillatormodule.Avo……