PID-Controlled PLL for Fast Frequency-Hopped Systems

In this work, a novel aided-acquisition technique based on proportional-integral-derivative (PID) control of a phase-locked loop (PLL) is presented. This is achieved by inserting a control block into the PLL during acquisition where originally the output frequency/phase is controlled by a PI controller. This significantly reduces the settling time of the PLL which is important for certain applications such as WLANs where fast frequency-hopped spread-spectrum methods are used. Simulations show that the proposed structure reduces the settling time by 75%.