A preliminary study of the Coherent Phase Synchronous Oscillator (CPSO) for Phase-Locked Loop (PLL) applications

This preliminary study reviews important features of the injection locked Synchronous Oscillator (SO), which is a multi-functional network to synchronize, track, and amplify a reference signal. The SO can reduce the phase noise and the acquisition time of the system. The Coherent Phase-Locked Synchronous Oscillator (CPSO) is then presented and analyzed as a modified phase-locked loop (PLL) where the voltage controlled oscillator (VCO) in a conventional PLL is replaced by a voltage controlled SO (VSO) for wireless applications. The CPSO not only retains all the properties of the SO, but also provides the coherency with zero phase shift across the frequency locking range. To demonstrate the feasibility of the CPSO, phase plane trajectories are plotted to analyze the phase behavior of the system. The behavior of the system with respect to phase noise reduction has also been analyzed.