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Phase margin for filter in sigma-delta DAC

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Yun Lin

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I meet a confuse question. When I design the filter, how to decide phase margin.
For example, if the passband is 24k (that main are used in audio), becasue of the no-ideal tansform function, the phase will shift from 0 after the low pass filter. So what is the spec for this design, is it 20 or 40 degree shift. Which number is reasonable for audio DAC and Why?
Or I don't need concern this.
 

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