Reference Frequency

Some articles on frequency, reference, reference frequency:

Phase-locked Loop - Elements - Feedback Path and Optional Divider
... and the feedback input to the phase detector to produce a frequency synthesizer ... but expensive, quartz crystal–controlled reference oscillator ... Some PLLs also include a divider between the reference clock and the reference input to the phase detector ...
Phase-locked Loop Block Diagram
... This input is called the reference ... loop uses a digital phase detector it may also have a divider in the feedback path or in the reference path, or both, in order to make the PLL's output signal frequency a rational ... A non-integer multiple of the reference frequency can also be created by replacing the simple divide-by-N counter in the feedback path with a programmable pulse swallowing counter ...

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