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sigma delta fractional n pll

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kjjian

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Does here someone have worked for multiple bit Σ△frctional n pll?
I want to know if there is a multi bit Σ△ modulator is used in fractional n pll, then you must have a multi modulus divider?
and how the control circuit realization between the multi bit Σ△ modulator and multi modulus divider?
 

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