title: Passive phase noise cancellation scheme.
abstract: We introduce a new method for reducing phase noise in oscillators, thereby improving their frequency precision. The noise reduction is realized by a passive device consisting of a pair of coupled nonlinear resonating elements that are driven parametrically by the output of a conventional oscillator at a frequency close to the sum of the linear mode frequencies. Above the threshold for parametric instability, the coupled resonators exhibit self-oscillations which arise as a response to the parametric driving, rather than by application of active feedback. We find operating points of the device for which this periodic signal is immune to frequency noise in the driving oscillator, providing a way to clean its phase noise. We present results for the effect of thermal noise to advance a broader understanding of the overall noise sensitivity and the fundamental operating limits.
authors.affiliation: Kavli Nanoscience Institute and Condensed Matter Physics, California Institute of Technology, MC 149-33, Pasadena, California 91125, USA.
authors.forename: Eyal
authors.initials: E
authors.lastname: Kenig
authors.forename: M C
authors.initials: MC
authors.lastname: Cross
authors.forename: Ron
authors.initials: R
authors.lastname: Lifshitz
authors.forename: R B
authors.initials: RB
authors.lastname: Karabalin
authors.forename: L G
authors.initials: LG
authors.lastname: Villanueva
authors.forename: M H
authors.initials: MH
authors.lastname: Matheny
authors.forename: M L
authors.initials: ML
authors.lastname: Roukes
mesh_terms: D008962:Models, Theoretical; D009991:Oscillometry / Q000295:instrumentation / Q000379:methods*; D059629:Signal-To-Noise Ratio