Personal communications device with GPS receiver and common clock source
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United States of America Patent
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Nov 18, 2003
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N/A
app pub date -
Apr 18, 2000
filing date -
Apr 18, 2000
priority date (Note) -
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Abstract
The invention is directed to a personal telecommunications device having both global positioning systems (GPS) and telecommunications provisions which share a common clock source. GPS provisions include a feedback loop for controlling an oscillator that generates a GPS system signal based upon the common clock signal. The feedback loop includes a frequency synthesizer for generating a feedback control signal, a phase comparator for generating a control signal in accordance with the feedback signal and the common clock signal, and a loop filter for processing and outputting the control signal to the oscillator to control the frequency of GPS system signals.
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