An edge-missing compensator for fast-settling wide-locking-range PLLs

An ideal phase detector (PD) produces an output signal whose DC value is linearly proportional to the phase difference (??) between the phases of its two periodic inputs. In practice, however, the transfer curve of the PD may not be linear or even monotonic for large ??. With a nonlinear PD, the transient response of PLL cannot be easily formulated and slow down the acquisition behavior [1].