Vibration-induced PM noise in oscillators and measurements of correlation with vibration sensors

Abstract

-We present data that show correlations between phase fluctuations in a low g-sensitive 10 MHz oven-controlled quartz oscillator (OCXO) and acceleration/vibration sensors. We describe the equipment setup and measurement procedure. Data are in the form of scatter plots, which we find to be highly informative compared to usual L(f) plots when the oscillator is subjected to vibration.

Vibration-Induced PM Noise in Oscillators and Its Suppression

“…However, these oscillators are sensitive to acceleration that can be in the form of steady acceleration, vibration, shock, or acoustic pickup. In most applications the acceleration experienced by an oscillator is in the form of vibration, which can introduce mechanical deformations that deteriorate the oscillator's otherwise low PM noise (Filler, 1988;Vig et al, 1992;Howe et al, 2005). This degrades the performance of the entire electronic system that depends on this oscillator's low phase noise.…”

Experimental Analysis of Vibration-induced Phase Noise of Crystal Oscillator Circuit

“…The phase noise of crystal oscillator circuit subjected to zero acceleration is shown in Fig.4 According to equation (6), the curve of the phase noise of output 2700MHz should parallel the curve of output 100MHz and the increment of phase noise between the two curves should be 28.63dBc at any offset frequency. In a word, in the zero acceleration environments, the phase noise of crystal oscillator circuit should only relate to the oscillator itself.…”

“…In 2005, D.A.Howe and his co-worker studied the correlation between the phase of noise resulted by vibration and the phase of vibrant acceleration [6].…”

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

“…• No other components except the DUT and accelerometer should be mounted on the shaker. • If possible, use 1 to 3 dB attenuators at the connector interfaces to minimize the effect of voltage-standingwave-ratio (VSWR) induced mechanical and multipath phase fluctuations [8]. • Ground loops interact with magnetic and electric fields generated by the vibrating actuator.…”