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How much phase margin is needed for a fractional-N pll?

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siboy

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Thanks in advance!
 

45 degrees is the bare minimum, and 60 degrees is the goal.
 

    siboy

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Thanks. Then in gerenal, how much the reality will be worser than the siulated result?
 

Actually , The frantional-N designis the same as general PLL. Just You must care spurious tone that you can accepted . Nornal the Loop- bandwith is lower for filter the spurious tone.
 

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