Vibration-induced PM Noise in Oscillators and Studies of Correlation ...

Random Vibration-Induced Phase Noise
Random vibration’s contribution to phase noise is given by:
() [ ( )( ) ] 2
1
⎛ Γ • Af
⎞ 0 L f = 20 log
⎜ , where lAl
= 2 PSD
2f
⎟
⎝ ⎠
e.g., if Γ = 1 x 10 -9 /g and f 0 = 10 MHz, then even if the
oscillator is completely noise free at rest, the phase “noise”
i.e., the spectral lines, due solely to a vibration
PSD = 0.1 g 2 /Hz will be:
Offset freq., f, in Hz
1
10
100
1,000
10,000
R. L. Filler, "The Acceleration Sensitivity of Quartz Crystal Oscillators: A
Review," IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency
Control, Vol. 35, No. 3, pp. 297-305, May 1988.
L’(f), in dBc/Hz
-53
-73
-93
-113
-133