Vibration-Induced PM Noise in Oscillators and Its Suppression

Hati, Archita; Nelson, Craig W.; Howe, David A.

doi:10.5772/6476

Cited by 14 publications

(5 citation statements)

References 37 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…When the data are converted to a logarithmic scale and fit to a linear regression, the resulting slope is approximately −2.2, so the PSD is proportional to l −2.2 . This result is consistent with (7) to within the accuracy of our experiments.…”

Section: Resultssupporting

confidence: 94%

Inverse relationship between the OEO Q-factor and vibration sensitivity

Cahill

Carter

Menyuk

et al. 2013

2013 Joint European Frequency and Time Forum &Amp; International Frequency Control Symposium (EFTF/IFC)

View full text Add to dashboard Cite

External vibrations induce phase noise in low noise oscillators such as the OEO (opto-electronic oscillator). The gsensitivity quantifies the efficiency of this process. In fiber-based OEOs, vibrations of the fiber spool dominate the generation of phase noise. In this case, we observe decreasing g-sensitivity with increasing Q-factor (i.e., fiber length). This result indicates the interplay of two effects. First, only a portion of the optical fiber is affected by vibrations of the spool, even though the entire spool is subjected to vibrations. For the spools that we studied, the effective length is less than 500 m. Second, as the Q-factor increases, an OEO "filtering" effect reduces the phase noise that is induced by a constant magnitude perturbation. These results can be used to optimize the g-sensitivity of fiber-based OEOs by either reducing it for low phase noise RF generation or increasing it for sensing applications.

show abstract

Section: Resultssupporting

confidence: 94%

Inverse relationship between the OEO Q-factor and vibration sensitivity

Cahill

Carter

Menyuk

et al. 2013

2013 Joint European Frequency and Time Forum &Amp; International Frequency Control Symposium (EFTF/IFC)

View full text Add to dashboard Cite

show abstract

“…Measurements show that the acceleration sensitivity of the DRO is much greater in z-axis compared with the x-and y-axes. For example, the acceleration sensitivity for the z-axis in a DRO can be an order of magnitude greater than the other axes [18].…”

Section: Measurement Resultsmentioning

confidence: 99%

“…It is observed that reduction in the spurious sidebands is far less than the expected theoretical values described by (28), here we discuss how and why practical sideband reduction could be in the vicinity of the measured values. Consider (18), these differential equations describe the dynamic behaviour of two mutually coupled oscillators. It is common to assume a quadratic behaviour for non-linear resistance (R D ) to model the non-linearity…”

Section: Dynamic Simulation and Discussionmentioning

confidence: 99%

Vibration sensitivity reduction of two microwave oscillators using inter‐injection locking technique

Modarresi

Banai

Farzaneh

2013

IET Microwaves, Antennas & Propagation

View full text Add to dashboard Cite

Phase noise is one of the most important specifications of microwave oscillators. External factors such as mechanical vibrations increase the phase noise of the oscillator. A novel technique is introduced to reduce vibration‐induced phase noise using inter‐injection locking of two coupled oscillators. Two similar oscillators with equal free running frequencies are chosen and are subjected to sinusoidal vibration. The mechanical configuration is such that vibration sensitivity vector increases the frequency of one oscillator and decreases the other one's frequency of oscillation. Coupling these two oscillators using inter‐injection locking, the common after‐lock frequencies of both oscillators would be equal to the free running frequency of oscillation; as such the influence of vibration on the oscillators is reduced. Experimental measurements are carried out to confirm the proposed technique.

show abstract

“…The type of the material used in the oscillator is also another degree of freedom that could be utilized for reducing acceleration sensitivity. As explained in [ 21 ], experimental results obtained from two different air-dielectric cavity oscillators made from two different materials, ceramic and aluminum, showed almost one sixth times lower acceleration sensitivity for the one made of ceramic. Optical oscillators also showed low acceleration sensitivities due to their small size [ 22 ].…”

Section: Introductionmentioning

confidence: 93%

Acceleration Sensitivity in Bulk-Extensional Mode, Silicon-Based MEMS Oscillators

2018

View full text Add to dashboard Cite

Acceleration sensitivity in silicon bulk-extensional mode oscillators is studied in this work, and a correlation between the resonator alignment to different crystalline planes of silicon and the observed acceleration sensitivity is established. It is shown that the oscillator sensitivity to the applied vibration is significantly lower when the silicon-based lateral-extensional mode resonator is aligned to the <110> plane compared to when the same resonator is aligned to <100>. A finite element model is developed that is capable of predicting the resonance frequency variation when a distributed load (i.e., acceleration) is applied to the resonator. Using this model, the orientation-dependent nature of acceleration sensitivity is confirmed, and the effect of material nonlinearity on the acceleration sensitivity is also verified. A thin-film piezoelectric-on-substrate platform is chosen for the implementation of resonators. Approximately, one order of magnitude higher acceleration sensitivity is measured for oscillators built with a resonator aligned to the <100> plane versus those with a resonator aligned to the <110> plane (an average of ~5.66 × 10−8 (1/g) vs. ~3.66 × 10−9 (1/g), respectively, for resonators on a degenerately n-type doped silicon layer).

show abstract

Vibration-Induced PM Noise in Oscillators and Its Suppression

Cited by 14 publications

References 37 publications

Inverse relationship between the OEO Q-factor and vibration sensitivity

Inverse relationship between the OEO Q-factor and vibration sensitivity

Vibration sensitivity reduction of two microwave oscillators using inter‐injection locking technique

Acceleration Sensitivity in Bulk-Extensional Mode, Silicon-Based MEMS Oscillators

Contact Info

Product

Resources

About