I've got an oscillator spec that states an RMS period jitter of 1.7 ps and an RMS phase jitter of 0.85 ps.
I know that period jitter describes the deviations from the oscillator's average period over a number of randomly selected cycles, I'm not sure how to interpret the phase jitter. Apparently, it is defined as the integration of phase noises over a certain spectrum.
This raises a number of questions:
- is the phase jitter just another view of period jitter or does it contain unrelated information?
- why should I care about that number?
- is it a coincidence that phase jitter = 1/2 period jitter?