Back to results
US 8,994,465 B1Granted
Phase noise reduction control loop for oscillators using nonlinear resonator operation
AssigneeHRL Laboratories, LLC
InventorsRandall L. Kubena, Richard J. Joyce, Harris P. Moyer
Life of this patent
Estimating the term…
Abstract
A method for reducing the phase noise of a oscillator includes monitoring a phase slope of a resonator, and controlling the resonator to operate the resonator at a high phase slope condition, wherein the resonator comprises a piezoelectric material, or piezoelectric quartz.
Claims27
A method for reducing the phase noise of an oscillator comprising:
- monitoring a phase slope of a resonator;
- and
- controlling the resonator to operate the resonator at a high phase slope condition;
- controlling a phase and amplitude drive for the resonator such that an admittance of the resonator has a slope of phase angle versus frequency that approaches infinity near a nonlinear critical point;
- adding a phase dither to the phase and amplitude drive for the resonator in order to change an operating frequency of the oscillator;
- and
- determining the slope of the phase angle versus frequency from the phase dither and the change in the operating frequency of the oscillator.
4 more elements
A circuit for reducing the phase noise of an oscillator comprising:
- a resonator;
- a phase shifter coupled to the resonator for providing a phase drive and DC phase operating point to the resonator;
- a phase ditherer coupled to the phase shifter for providing a phase dither to the phase shifter;
- an amplifier coupled to the phase shifter and to the resonator for providing an amplitude drive to the resonator;
- and
- a controller for controlling the phase dither and a frequency of the phase dither, and for adjusting the phase drive and the amplitude drive based on the phase dither and a change in frequency of the oscillator due to the phase dither.
3 more elements
Dependencies are inferred from the claim text.