Frequency offset correction techniques for crystals used in...

Details Frequency offset correction techniques for crystals used in... Frequency offset correction techniques for crystals used in...

2006-10-17

2006-10-17

Mis, David (Department: 2817)

Oscillators

With device responsive to external physical condition

Temperature or light responsive

C331S018000

Reexamination Certificate

active

07123106

ABSTRACT:
A method and system for pulling a crystal frequency are provided, thereby allowing wireless stations to use less accurate crystal oscillators and dramatically reduce cost. A first frequency offset can be determined using a temperature-based method. This temperature-base method can include detecting a temperature substantially that of the crystal oscillator and then using that temperature to determine the first frequency offset. A second frequency offset using a closed loop frequency estimate-based method can also be determined. This frequency estimate-based method can include synchronizing the crystal frequency to a presumed, accurate frequency of a controlling device to determine the second frequency offset. Both the first and second frequency offsets can be used to pull the crystal frequency. A synthesizer can also be pulled to fine tune a carrier frequency derived from the crystal frequency.

REFERENCES:
patent: 5629649 (1997-05-01), Ujiie

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