LOW POWER CLOCK SOURCE

摘要

An ultra-low power clock source includes a compensated oscillator and an uncompensated oscillator coupled by a comparator circuit. In an example, the compensated oscillator is more stable than the uncompensated oscillator with respect to changes in one or more of temperature, voltage, age, or other environmental parameters. The uncompensated oscillator includes a configuration input configured to adjust an operating characteristic of the uncompensated oscillator. In an example, the uncompensated oscillator is adjusted using information from the comparator circuit about a comparison of output signals from the compensated oscillator and the uncompensated oscillator.

主权项

1. An apparatus, comprising:
a first oscillator circuit including a first oscillator output; a second oscillator circuit including a configuration input and a second oscillator output; and a comparator circuit including first and second comparator inputs respectively controllably coupleable to the first and second oscillator outputs; wherein a first oscillator output signal from the first oscillator output deviates less from a specified output period as compared to a second oscillator output signal from the second oscillator output; and wherein the second oscillator circuit is configured to adjust, using the configuration input, the second oscillator output signal based on information obtained from the comparator circuit about a comparison between the first oscillator output signal and the second oscillator output signal.