I'm trying to learn about pll wander or drift. My reading leads me to believe one of the reasons plls were developed was to fight wander so maybe it does not effect plls? Although I've seen some things about the wander of the source becoming the wander of the pll or perhaps noise higher in frequency than the pll can handle doing the same.
If I have two PLLs in two separate chips, both of which are fed from the same oscillator. Then I set them both to the same frequency I feel like they will jitter, and that I won't know the phase difference, but that they should not wander away from one another over time because they both share the same reference clock. So the plls will constantly be trying to correct their output to the same reference, thus keeping them close (within 1 bit time).
If they both used their own reference clock I could understand how they could wander because one might be slightly faster than the other.
Am I right or wrong about that? Do plls wander from their reference? Thanks!