Wireless communications system including dual-purpose clock reference for global positioning system and baseband
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United States of America Patent
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Dec 15, 2015
Grant Date -
Aug 20, 2015
app pub date -
May 6, 2015
filing date -
Jun 24, 2009
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Abstract
A wireless communications system includes a clock module, a global positioning system (GPS) module, an integrated circuit for a cellular transceiver, and a baseband module. The clock module is configured to generate a first clock reference that is not corrected using automatic frequency correction (AFC). The GPS module is configured to operate in response to the first clock reference. The integrated circuit includes a system phase lock loop (PLL) configured to (i) operate in response to the first clock reference, and (ii) generate a corrected clock reference by performing AFC on the first clock reference in response to an AFC signal. The baseband module is configured to (i) operate in response to the first clock reference from the clock module, and (ii) generate the AFC signal.
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