Digital locked loop for producing a clock having a selected frequency ratio relative to a clock produced by a MEMS-based oscillator

摘要

A Micro Electrical Mechanical System (MEMS) oscillator supplies a MEMS clock signal to a digital locked loop that generates an output clock signal having a frequency that corresponds to a desired frequency ratio between the MEMS oscillator output signal and the digital locked loop output signal. The frequency ratio may be determined, at least in part, as a function of temperature.

主权项

1. An apparatus comprising:
a Micro Electrical Mechanical System (MEMS) oscillator to supply a MEMS oscillator output signal; and a digital locked loop coupled to receive the MEMS oscillator output signal and to receive a desired frequency ratio and to supply a digital locked loop output signal having a frequency that corresponds to the desired frequency ratio between the MEMS oscillator output signal and the digital locked loop output signal, wherein a first temperature coefficient of the digital locked loop output signal is lower than a second temperature coefficient of the MEMS oscillator output signal.