Design and analysis of adaptive-bandwidth all-digital phase-locked loop

To obtain better locking performance and wider locking range, the adaptive-bandwidth all-digital phase-locked loop (AB-ADPLL) is proposed and designed in the paper. With the AB-ADPLL, the parameters of the digital loop filter can be adaptively adjusted using a parameter estimator in accordance with the input frequency. From the design example given in the context and corresponding simulation results, it is disclosed that the AB-ADPLL outperforms the non-adaptive ADPLL.