Frequency reference correction for temperature-frequency hysteresis error

摘要

Disclosed and claimed is a method of improving the effective frequency stability of a frequency reference, wherein an algorithm utilizing temperature frequency hysteresis characterization values or hysteresis model parameters, and temperature history data, is used to account for effects of temperature frequency hysteresis. Devices and manufacturing systems are also claimed.

主权项

1. A method of improving the frequency stability of a frequency reference, or improving the effective frequency stability of a frequency reference in a host application system, comprising:
a) retrieving from memory data indicative of one or more temperature-frequency hysteresis characterization values or hysteresis model parameters, b) retrieving from memory data indicative of an accumulated hysteretic effect of the prior temperature history, and continually or periodically updating this data, c) executing an error calculation algorithm arranged to calculate an estimate of any reference frequency error using said hysteresis characterization values or said hysteresis model parameters, and said data of step (b), and d) using said estimate of frequency error to correct the reference frequency, or to mitigate the effect of reference frequency error in the host application system.