METHOD AND SYSTEM FOR CALIBRATING AN OSCILLATOR CIRCUIT USING A NETWORK BASED TIME REFERENCE

摘要

A method and system of compensating for reference frequency drift utilizes time stamps from a networked reference clock to adjust a local crystal oscillator (104) of a communications device (100). In an example embodiment, a microprocessor arrangement (106) of the communications device obtains a synchronization time stamp from a networked clock arrangement (150 or 160) and synchronizes the local oscillator clock and a clock circuit of the microprocessor with the time stamp. After a predetermined time duration has transpired, a calibration time stamp is obtained from the network clock and the difference between the calibration time stamp and the current time of the clock circuit is extracted. The clock circuit and the networked clock arrangement are than synchronized and the local crystal oscillator is adjusted for crystal aging as a function of the difference between the calibration time stamp and the current time of the clock circuit.