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 > App Notes > FILTER CIRCUITS (ANALOG) VIDEO CIRCUITS

Keywords: 3-pole, butterworth, active filter, low pass filter, video, output, NTSC, PAL, reconstruction filtering, Mar 28, 2002
operational amplifier, op amp, opamps

APPLICATION NOTE 1028
SDTV Reconstruction Filter with Adjustable Group Delay

Abstract: The MAX4450 operational amplifier configured in a 3-pole, low-pass Sallen-Key filter provides a
Butterworth response with a bandwidth of -3dB at 5.25MHz. This circuit can be used for video anti-aliasing and
reconstruction filtering for composite (CVBS) or S-Video signals in standard definition digital TV (SDTV)
applications. The circuit is designed to drive a 75 termination, common in video applications, with an overall
gain of 1.


This application note describes a 5