Title :
A Second-Order Frequency-Aided Digital Phase-Locked Loop for Doppler Rate Tracking
Author_Institution :
LinCom Corp., Pasedena, CA, USA
fDate :
8/1/1980 12:00:00 AM
Abstract :
A second-order digital phase-locked loop (DPLL) has a finite lock range which is a function of the frequency of the incoming signal to be tracked. For this reason, it is not capable of tracking an input with Doppler rate for an indefinite period of time. In this correspondence, an analytical expression for the hold-in time is derived. In addition, an all-digital scheme to alleviate this problem is proposed based on the information obtained from estimating the input signal frequency.
Keywords :
PLLs; Phase-locked loop (PLL); Clocks; Costs; Digital integrated circuits; Frequency estimation; Frequency locked loops; Integrated circuit reliability; Large scale integration; Phase locked loops; Tracking loops; Very large scale integration;
Journal_Title :
Communications, IEEE Transactions on
DOI :
10.1109/TCOM.1980.1094787
