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Thesis Dissertation review on a new control perspective on phase locked loops The technique of phase-locked loop (PLL), an essential means for online frequency detection of incoming signal, which is widely used in our modern day communication system. PLL is traditionally viewed as a non-linear feedback control loop that will automatically locks the adjustable frequency of a local oscillator in reference to the incoming signal. However, the classic PLL technique has reviewed its first sign of weakness, limited convergence performance and complex in structure implementation. To overcome these weaknesses and to improve its current performance, the final outcome of the project is to bring about a better developed idea in frequency estimation compared with the present PLL technique.A new approach known as adaptive observer method, which allowed direct estimation on frequency of an incoming signal, was recently proposed in the control literature. The underlying principle of this project is to investigate the possible use of adaptive observer method for detecting frequencies directly from any sinusoidal signals, and as well as to improve its ability in terms of better performance. Both classic PLL technique and adaptive observer method are compared through several aspects, for instance theoretical study and software simulation. However, due to adaptive observer method is significantly over-performed the PLL technique at the stage of simulation. Tanuku, S. MSc Automatic Control Masters 2009-01-01 Hou, Ming University of Hull oai:hull-repository.worktribe.com:4209174 https://hull-repository.worktribe.com/4209174/1/Thesis Engineering https://hull-repository.worktribe.com/output/4209174 2009 en openAccess Public