Using Class D for tracking power supply?

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Nice link, thanks. I've read from several sources that dead time in the switches are the biggest source of distortion. Why not do this and prevent this type of distortion in the first place?

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The output filter is passive, and ideally has only linear distortion (aka controlled frequency response). Phase response must be nonlinear in a filter. A first order filter has an arctangent phase curve. Linear phase only delays the original waveform, and an all-pass filter can be used to alter the phase response of a filter without altering its amplitude response.
 
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