Silicon Laboratories Inc.
Delay adjustment using frequency estimation

Abstract:

A method includes generating first frequency metrics for a first received network clock signal using a local reference clock signal. The method includes, in response to the first received network clock signal being available and satisfying a quality metric, generating a network delay estimate using a first error estimate based on the first received network clock signal, and updating stored frequency metrics for the first received network clock signal with the first frequency metrics. The method includes generating an output clock signal based on received packets and the network delay estimate. The first frequency metrics for the first received network clock signal may include a current average frequency count, a prior average frequency count, a standard deviation of prior average frequency counts and a multiplicative constant corresponding to a number of samples used to determine the current average frequency count, prior average frequency count, and standard deviation.