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how to determine the loop filter's BW when we use a Fractional PLL

Question asked by python on Aug 13, 2012
Latest reply on Aug 14, 2012 by mcurtin99

as we know, in an integrated PLL, we usually use 1/20 or 1/10 PFD's frequency as its loop filter' BW. But when using a fractional-n pll, how to select the BW of the loop filter. thanks.