A New Approach on Design of a Digital Phase-Locked Loop

In this letter, we propose a new approach to the design of a digital phase-locked loop (DPLL) with a finite impulse response (FIR) structure, deadbeat property, and H_∞ performance. This DPLL is called the deadbeat H_∞ FIR DPLL (DHFDPLL). The proposed DHFDPLL ensures the H_∞ performance against incorrect information on noise and has intrinsic robustness against quantization effects because of the FIR structure. Demonstrative simulations are provided to show that the DHFDPLL exhibits excellent robustness against effects of incorrect noise and quantization compared with the existing DPLLs.