Fractional/Integer-N PLL Basics - Texas Instruments
To accomplish this, a reference frequency must be provided to the phase detector. Typically, the TCXO frequency (Fx), is divided down (by R) “on-board” the PLL IC. The phase detector utilizes this signal as a reference to tune the VCO and, in a “locked state,” it must be equal to the desired output frequency, Fvco, divided by N.
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