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Translation loop or traditional PLL using a N divider, which to choose?

ADF4401a uses a mixer to down convert the VCO output frequency for a PFD while traditional PLLs use a N divider to divide the VCO output frequency to a relative low frequency for PFD. So which solution is better? What is the difference in the final output phase noise? Looking forward to your reply!

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[edited by: ggall at 9:59 AM (GMT -4) on 30 Aug 2021]