Ensemble of mems oscillators in a highly accurate and resilient clock system

Abstract

Disclosed is a clock system for generating an error-reduced clock output. In one implementation, the clock system includes a plurality of physical clusters of MEMS oscillators that provide a set of associated clock inputs to a processor. The processor performs RMS error correction and/or Kalman filtering and/or Bayesian particle filtering to generate an oscillator control output to adjust a frequency of a controlled MEMS oscillator to generate the error-reduced clock output. In another implementation, the processor configures the MEMS oscillators into a dynamic plurality of logical clusters instead of relying on a plurality of physical clusters. The processor performs RMS error correction and/or Kalman filtering and/or Bayesian particle filtering to generate an oscillator control output to adjust a frequency of a controlled MEMS oscillator to generate the error-reduced clock output. Also disclosed are techniques for compensating for errors related to temperature drift, tilt, and age drift of the MEMS oscillators.