Advanced phase-locked-loop oscillators

The methods of RF phase locked loops for active mode‐locking picosecond laser with different repetition rates

“…In [21], an PLL construction based on integrating an adaptive frequency estimator into a standard phase locked loop which is subsequently linearized to obtain a linear time-invariant model that facilitates both analysis and design of the enhanced phase locked loop is described. While [22] presents a two-point modulation PLL system and [23] gave a good performance PLL method. We could adapt traditional PLL theory to establish our own PLL system for PSL.…”