Investigations on noise-suppression effects of nonlinear feed-back loops in microwave oscillators

Full-scale calculations are described regarding the phase noise suppression effects of an additionally inserted highly nonlinear feedback loop in microwave oscillators. Calculations are done in two fields both focusing on the measure of reduction in the noise level. One results in significant reduction of the noise added by internal flicker noise sources of the active device, while the other shows the effect of nonlinear loop over the incident noises coming from the environment. Results confirming theoretical background of these effects are also reported.