Research and Simulation on Optimization of Phase Noise in Crystal Oscillators
The methods to reduce phase noise of crystal oscillators based on Leeson model are presented in the paper. According to analysis of Leeson formula, phase noise has a direct relation with noise factor, corner frequency and loaded quality factor. It can be seen that optimization of phase noise can be realized form these three aspects. The feasibility of these methods to reduce phase noise is analyzed. Based on the method of reducing phase noise by improving loaded quality factor, calculation of loaded quality factor is carried out and phase noise of a Butler crystal oscillator is simulated by the Agilent Advanced Design System (ADS). The simulation results prove that this method to reduce phase noise based on improving loaded quality factor is feasible and effective.
Y. Wang and X. H. Huang, "Research and Simulation on Optimization of Phase Noise in Crystal Oscillators", Applied Mechanics and Materials, Vol. 232, pp. 631-634, 2012