Apparatus and method for calibration of sleep mode clock in wireless communications mobile station
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United States of America Patent
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Nov 30, 1999
Grant Date -
N/A
app pub date -
Jun 17, 1997
filing date -
Jun 17, 1997
priority date (Note) -
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Abstract
The present invention presents a calibrator for a mobile station of a TDMA wireless communications system such that the calibrator calibrates a low-frequency clock to a high frequency clock locked to system timing. When the mobile station is in idle mode (i.e., listening to a paging channel periodically, but otherwise taking no action), the control processor commands the mobile station to enter into sleep mode to minimize power consumption. During sleep mode, the high-frequency reference clock and all clocks derived from it are turned off. Only the calibrated low-frequency clock remains operating to clock the sleep logic.
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