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Frequency Precision of Oscillators Based on High-Q Resonators

Kenig, Eyal and Cross, M. C. (2015) Frequency Precision of Oscillators Based on High-Q Resonators. . (Unpublished)

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We present a method for analyzing the phase noise of oscillators based on feedback driven high quality factor resonators. Our approach is to derive the phase drift of the oscillator by projecting the stochastic oscillator dynamics onto a slow time scale corresponding physically to the long relaxation time of the resonator. We derive general expressions for the phase drift generated by noise sources in the electronic feedback loop of the oscillator. These are mixed with the signal through the nonlinear amplifier, which makes them {cyclostationary}. We also consider noise sources acting directly on the resonator. The expressions allow us to investigate reducing the oscillator phase noise thereby improving the frequency precision using resonator nonlinearity by tuning to special operating points. We illustrate the approach giving explicit results for a phenomenological amplifier model. We also propose a scheme for measuring the slow feedback noise generated by the feedback components in an open-loop driven configuration in experiment or using circuit simulators, which enables the calculation of the closed-loop oscillator phase noise in practical systems.

Item Type:Report or Paper (Discussion Paper)
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Additional Information:This research was supported by DARPA through the DEFYS program and the National Science Foundation under Grant No. DMR-1003337. The authors thank L. G. Villanueva, R. B. Karabalin, M. H. Matheny, Ron Lifshitz, and M. L. Roukes for useful discussions.
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Defense Advanced Research Projects Agency (DARPA)UNSPECIFIED
Record Number:CaltechAUTHORS:20190628-082547756
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Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:96807
Deposited By: Tony Diaz
Deposited On:28 Jun 2019 17:13
Last Modified:03 Oct 2019 21:25

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