Effect of vibration on PM and AM noise of oscillatory and non-oscillatory components at 10 GHz

Abstract

The performance of microwave components is sensitive to vibrations to some extent. Among them, microwave cables and connectors, bandpass filters, mechanical phase shifters and some nonlinear components are the most sensitive. The local oscillator is one of the prime performance-limiting components in microwave systems ranging from simple RF receivers to advanced radars. The increasing present and future demand for low acceleration sensitive oscillators, approaching 10 -13 /g, requires a re-examination of sensitivities of basic nonoscillatory building block components under vibration. The purpose of this paper is to study the phase-modulation (PM) noise performance of an assortment of oscillatory and nonoscillatory microwave components under vibration at 10 GHz. We point out some challenges and provide suggestions for accurate measurement of vibration sensitivity of these components. We also study the effect of vibration on the amplitude-modulation (AM) noise.

Optimizing performance of phase locked oscillator for high vibration environment

“…Oscillator vibration results in signal frequency modulation (FM) and amplitude modulation (AM) whereas vibration in non-oscillator components and sub-assemblies also results in signal phase modulation (PM) [1,2,6]. The most serious issue arises due to the oscillator which results in generation of sidebands with the increase in signal frequency due either to frequency multiplication or direct frequency generation at higher frequency.…”