Title :
Acquisition performance of 2nd-order phase-locked loops in the presence of time delay for switched and swept signal conditions
Author :
McGeehan, J.P. ; Lymer, A.
Author_Institution :
University of Bath, School of Electrical Engineering, Bath, UK
fDate :
8/1/1983 12:00:00 AM
Abstract :
The paper describes the acquisition behaviour of 2nd-order phase-locked loops with time delay ¿ for two different conditions of the input signal. When the input signal appears instantaneously, i.e. a process we have termed `switched¿ acquisition, the pull-in range limit obtained by Develet of ¿/4 Hz is confirmed. However, when the input signal is moved or swept towards the loop VCO frequency (or vice-versa), a distinct phenomenon, which we have termed `swept¿ pull-in, has been observed. For a large gain type 1 or type 2 loop, it is shown that, for frequency offsets greater than ¿/4 Hz, the loop will not lock unless a minimum sweep rate is exceeded.
Keywords :
phase-locked loops; PLL; acquisition behaviour; acquisition performance; frequency offsets; minimum sweep rate; phase-locked loops; pull-in range limit; second order; swept signal conditions; switched signal conditions; time delay;
Journal_Title :
Electronic Circuits and Systems, IEE Proceedings G
DOI :
10.1049/ip-g-1:19830024