Method and apparatus for adjusting reference oscillator...

Details Method and apparatus for adjusting reference oscillator... Method and apparatus for adjusting reference oscillator...

2010-11-09

2011-11-22

Doan, Kiet (Department: 2617)

Telecommunications

Receiver or analog modulated signal frequency converter

Local control of receiver operation

C455S258000, C701S213000

Reexamination Certificate

active

08064860

ABSTRACT:
A method and apparatus for using a conventional oscillator in a cellular telephone transceiver as a source of a reference signal for a GPS receiver. In one embodiment, the method comprises using a voltage-controlled oscillator (“VCXO”) within a cellular telephone transceiver to generate a reference frequency signal for the GPS receiver. Circuitry within the telephone transceiver generates a frequency error signal. Both of these signals are coupled to GPS circuitry and used to control a carrier numerically controlled oscillator (“NCO”) and a code NCO. The NCOs produce a tuning signal and a timing signal, respectively. The GPS circuitry uses the NCO generated signals to process GPS signals.

REFERENCES:
patent: 6496533 (2002-12-01), Lennen
patent: 2003/0068977 (2003-04-01), King
patent: 2003/0154025 (2003-08-01), Fuchs et al.

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