Patent ID: 9041475
Filing Date: 2015-05-26
Classification: H03L

Abstract:
1. A method of controlling an integrated circuit chip comprising a first clock source and a second clock source, the first clock source being more thermally stable and having a higher power consumption than the second clock source, the integrated circuit chip being operable in a first mode in which the first clock source is inactive and the second clock source is active and being operable in a second mode in which the first clock source is active and the second clock source is active, the method comprising: operating the integrated circuit chip in the first mode; periodically taking a measurement indicative of temperature; only if the measurement indicates that the temperature is outside of a temperature band: wherein for subsequent measurements indicative of temperature in the first mode, if the measurement indicates that the temperature is outside of the updated temperature band, performing the activating, recalibrating and deactivating steps.