Close-in phase noise reduction in an oscillator based on 222 MHz non-linear contour mode AlN resonators

Phase Noise noise reduction in oscillators can be accomplished by using nonlinearly driven resonators locked into a particular nonlinear state that fulfill specific frequency and phase conditions. In this work, we experimentally demonstrate this theory by showing a substantial improvement of the close-in phase noise (lowered by as much as -20dBc/Hz @ 100Hz) of a 222 MHz oscillator that incorporates a nonlinearly driven AlN contour mode resonator (CMR).