In AN-2623, when using a 120MHz reference frequency, is it necessary to set R=3 to ensure an integer value for the phase detector (PD) frequency of 40MHz for fast calibration at 10GHz?

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To operate down to 10 GHz with a phase detector frequency (PFD) of 120 MHz, it is necessary to divide down the reference frequency. This can be achieved by setting R=3, which results in a PD frequency of 40 MHz for fast calibration. If the minimum frequency requirement is not 10 GHz, an alternative approach is to use a higher Nmin value, such as 84, which would yield a minimum frequency of 10.08 GHz with a 120 MHz PFD.

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