Noise modeling methodology of an integrated circuit for quartz crystal oscillator

This paper reports the methodology and results of noise modeling and tests of a quartz crystal oscillator based on a dedicated integrated circuit (ASIC). Unfortunately, the phase noise of the inner sustaining amplifier is unknown. The challenge is to evaluate the performance limits of this ASIC in an oscillator circuit. The oscillator phase noise computation results from the knowledge of individual intrinsic noise of the sustaining amplifier and the resonator respectively are presented. Moreover the simulation results are compared with the oscillator phase noise measurements.