Page 34 - Phase-Locked Loops Design, Simulation, and Applications
P. 34
than the output frequency ω ′. The u signal then generates more positive transitions per unit
2
1
of time than the signal u ′. Looking at Fig. 2.12, we see that the PFD can toggle only
2
between the states 0 and 1 under this condition but will never go into the −1 state. If ω is
1
much higher than ω ′ furthermore, the PFD
2
Printed from Digital Engineering Library @ McGraw-Hill (www.Digitalengineeringlibrary.com).
Copyright ©2004 The McGraw-Hill Companies. All rights reserved.
Any use is subject to the Terms of Use as given at the website.
