word definition:
source: http://www.webopedia.com/TERM/P/PLL.html
Short for phase-locked loop, an
electronic circuit that controls an oscillator so that it maintains a
constant phase angle (i.e., lock) on the frequency of an input, or
reference, signal. A PLL ensures that a communication signal is locked
on a specific frequency and can also be used to generate, modulate and demodulate
a signal and divide a frequency.PLL is used often in wireless communications where the oscillator is
usually at the receiver and the input signal is extracted from the
signal received from the remote transmitter.
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Detailed explanation by Tony van Roon (VA3AVR):
source: http://www.uoguelph.ca/~antoon/gadgets/pll/pll.html
PLL stands for 'Phase-Locked
Loop' and is basically a closed loop frequency control system,
which functioning is based on the phase sensitive detection of phase
difference between the input and output signals of the controlled
oscillator (CO). You will find no formulas or other complex math within
this tutorial. I decided to keep it simple.
Suggested Reading on PLL Topics:
"Design of Phase-Locked Loop Circuits". Howard M.
Berlin. Publisher Sams. ISBN: 0-672-21545-3.
"Phase-Locked Loop Circuit Design". Dan H. Wolaver. Worcester
Polytechnic Institute. ISBN: 0-13-662743-9
"Phaselock Loop". A. Blanchard. N.Y., John Wiley and Sons, 1976.
"Phase Locked Loops". Chapman & Hall, 1993. Original version:
Systémes á verrouillage de phase (P.L.L.) Masson, Paris, 1989
"Modern Communication Circuits". J. Smith. McGraw-Hill, 1986.
"Phase-Locked Loop: Design, Simulation, and applications". Donald E.
Best, McGraw-Hill, 4th edition
"Phase-Locked Loops, Theory, Design and Applications". Roland Best.
McGraw-Hill, NY 1984. ISBN: 0-07-911386-9.
"Synchronization System in Communications & Control". W.C.Lindsey.
Englewood Hall NJ, Prentice hall, 1972.
"Digital PLL Frequency Synthesizers". Ulrich Rohde. Prentice-Hall,
London, 1983.
"Digital Frequency Synthesis Demystified". B.G. Goldberg, LLH
Publishing, 1999
"Phaselock Techniques". Floyd M. Gardner. John Wiley & Sons, New
York, 1981, 2nd edition.
"Principles of Coherent Communication". McGraw-Hill, New York, 1966.
"La réception Synchrone", Onde Electrique, volume 11, 1932. by H. de
Bellescise.
"Phase-Locked Loop Basics". William Egan, Wiley InterScience, July 1998
"Frequency Synthesis". by V.F. Kroupa. Wiley, New York, 1973
"The Art of Electronics". Horowitz and Hill. 2nd Edition, 1989.
Cambridge University Press. ISBN: 0-521-37095-7. |
