低成本电路转换低失真正弦波的时钟

摘要：这种电路派生纯正弦波从晶体控制时钟源所使用的环形计数器来删除最高振幅有害的谐波，和过滤结果与8阶低通、开关电容椭圆筛选器（MAX7400）。

Maxim>AppNotes>FilterCircuits(Analog)SignalGenerationCircuitsKeywords:sinewavegenerators,low-distortionsignalgenerators,crystal-stabilizedoscillators,ringcounters,weighted-resistanceDec21,2010networks,lowpassellipticfilters,switched-capacitorfiltersAPPLICATIONNOTE4547Low-CostCircuitConvertsClocktoLow-DistortionSinewaveAbstract:Thiscircuitderivesapuresinewavefromacrystal-controlledclocksourcebyusingaringcountertoremovethehighest-amplitudeunwantedharmonics,andfilteringtheresultwithan8th-orderlowpass,switched-capacitorellipticfilter(MAX7400).AsimilarversionofthisarticleappearedintheOctober2007issueofPDmagazine.Asimple,low-costcircuit(Figure1)usestheexistingclockinad