Adaptive TDTL using frequency and phase processing techniques

An adaptive initialization process for the first-order time delay digital tanlock loop (TDTL) is proposed. The process results in improving the system performance by widening its lock range and by having zero steady-state phase error. The proposed adaptive TDTL with zero phase error (ATDTL-ZPE) uses a feedforward initialization technique which results in freeing the loop from the frequency locking process. The loop phase detector is used only for phase locking purposes and hence result in zero steady-state phase error with a considerable improvement in the system locking range.