A new dynamic gain control algorithm for speed enhancement of digital-phase locked loops (DPLLs)

A dynamic gain modification algorithm of a class of DPLLs has been proposed to improve its transient characteristics and tracking behavior. In this technique, rather taking a time invariant gain, the gain of the loop digital filter is made a function of the sampled value of the signal at every sampling instant. It has been shown analytically as well as numerically that the new structure is faster than the conventional one in its acquisition time and at the same time, it has a broader acquisition range.