Re: Time domain & Frequency domain Jitter characterizati
In the first case, the PLL is used as a LO, where spectral purity is the ultimate specification. Higher phase noise would introduce reciprocal mixing.
In the second case, it is used as a clock for sampling, where the way the phase noise is spread-out does not matter as long as the area of phase noise curve over frequency axis is kept low (which is jitter).
"Mixing" and "Sampling" clearly differentiate the domain we have to be interested in.