Circuit for synchronizing CDMA mobile phones

Details Circuit for synchronizing CDMA mobile phones Circuit for synchronizing CDMA mobile phones

1997-12-12

2000-02-22

Kizou, Hassan

Multiplex communications

Communication over free space

Combining or distributing information via time channels

455343, 455 383, 455574, H04J 306, H04B 116, H04B 700

Patent

active

060288558

ABSTRACT:
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 amd the frequency comparator utilizes the calibration factor together with the low frequency oscillator clock signal to output a accurate and precision timed signal thereby being able to accurately require the timing of the paging channel.

REFERENCES:
patent: 5283568 (1994-02-01), Asai et al.
patent: 5590160 (1996-12-01), Ostman
patent: 5737323 (1998-04-01), Landsome
patent: 5910944 (1999-06-01), Callicotte et al.
patent: 5950120 (1999-09-01), Gardner et al.

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