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High-spectral-purity microwave oscillator: design using conventional air-dielectric cavity

By: Howe, D.A.; Sen Gupta, A.; Nava, J.F.; Walls, F.L.; Hati, A.; Nelson, C.;

2003 / IEEE / 0-7803-7688-9

Description

This item was taken from the IEEE Conference ' High-spectral-purity microwave oscillator: design using conventional air-dielectric cavity ' We report exceptionally low PM and AM noise levels from a microwave oscillator that uses a conventional air-dielectric cavity resonator as a frequency discriminator. Our approach is to increase the discriminator's intrinsic signal-to-noise ratio by use of a high-power carrier signal to interrogate an optimally coupled cavity, while the high-level of the carrier is suppressed before the phase detector. We developed and tested an accurate model of the expected PM noise that indicates, among other things, that a conventional air-dielectric resonator of moderate Q will exhibit less discriminator noise in this approach than do more esoteric and expensive dielectric resonators tuned to a high-order, high-Q mode and driven at the dielectric's optimum power.