Phase Lock Loop

1

• Phase Lock Loop

A device which continuously tries to track the
phase of the incoming signal
Phase detector
Se(t)
Low-pass filter, h(t)
Si(t)
So(t)
Voltage Controlled Oscillator

• Nonlinear feedback system
• Consider a first order PLL,

AKsin( )
-
2

• References

• Modern Digital and Analog Communication Systems
  B.P. Lathi, Oxford University Press, Second
  Edition.
• Andrew J. Viterbi, Phase-Locked Loop Dynamics
  in the presence of noise by Fokker-Planck
  Techniques, Proceedings of the IEEE, 1963.