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Low noise and low distortion design to eliminate aliasing and anti-imaging filters

  • 2013-09-20
  • 83.39KB
  • Points it Requires : 2

Many customers have requested more information about theanalog low-pass filters that appear in many of our PCMaudio data sheets. They are used for antialiasing in front ofADCs or for smoothing on the output of DACs. The followingbulletin is an excellent primer on the subject. —Ed.In any digitizing system, antialiasing and anti-imaging filtersare used to prevent the signal frequencies from “foldingback” around the sample frequency and causing false (oralias) signals from appearing in the signal we are attemptingto digitize. Very often, these filters must be very complex,high order analog filters in order to do their job effectively.

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