CIRCUIT FOR SYNCHRONIZING CDMA MOBILE PHONES

摘要

A frequency calibration circuit for use in a spread spectrum receiver. The receiver includes circuitry for receiving a spread spectrum signal from a base station and for recovering a network clock signal therefrom, a low frequency oscillator for producing an oscillator clock signal, and a frequency comparator that takes as inputs the network clock signal and the oscillator clock signal and produces a calibration factor based on the difference between the clock signals. A controller coupled to the low frequency oscillator and the frequency comparator utilizes the calibration factor together with the low frequency oscillator clock signal to output an accurate and precision timed signal thereby being able to accurately reacquire the timing of the paging channel.