SDTV的重构滤波器可调群时延

摘要：MAX4450运算放大器在3杆，低通Sallen-Key滤波器配置提供了一个Butterworth响应-3dB带宽为5.25MHz。该电路可用于过滤复合（CVBS）或S-视频信号在标准清晰度数字电视（SDTV）应用的视频抗锯齿和重建。该电路设计驱动一个75Ω终接，共同在视频应用的总增益为1。

Maxim>AppNotes>FILTERCIRCUITS(ANALOG)VIDEOCIRCUITSKeywords:3-pole,butterworth,activefilter,lowpassfilter,video,output,NTSC,PAL,reconstructionfiltering,Mar28,2002operationalamplifier,opamp,opampsAPPLICATIONNOTE1028SDTVReconstructionFilterwithAdjustableGroupDelayAbstract:TheMAX4450operationalamplifierconfiguredina3-pole,low-passSallen-KeyfilterprovidesaButterworthresponsewithabandwidthof-3dBat5.25MHz.Thiscircuitcanbeusedforvideoanti-aliasingandreconstructionfilteringforcomposite(CVBS)orS-VideosignalsinstandarddefinitiondigitalTV(SDTV)applications.Thecircuitisdesignedtodrivea75termination,commoninvideoapplications,withanoverallgainof1.Thisapplicationnotedescribesa5