Relationship of AM to PM noise in selected RF oscillators

The authors have studied the amplitude modulation (AM) and phase modulation (PM) noise in a number of 5-MHz and 100-MHz oscillators to provide a basis for developing models of the origin of AM noise. To adequately characterize the AM noise in high-performance quartz oscillators, it was found necessary to use two-channel cross-correlation AM detection. In the quartz oscillators studied, the power spectral density (PSD) of the f^-1 and f⁰ regions of AM noise is closely related to that of the PM noise. The major difference between different oscillators of the same design depends on the flicker performance of the resonator. It is therefore suggested that the f^-1 and f⁰ regions of AM and PM noise arise from the same physical processes, probably originating in the sustaining amplifier