FREQUENCY-LOCKING DEVICE AND FREQUENCY-LOCKING METHOD THEREOF
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United States of America Patent
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app pub date -
Jun 1, 2009
filing date -
Nov 1, 2006
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Abandoned
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Abstract
A frequency-locking device including a digitally-controlled oscillator (DCO) and a comparing unit is disclosed. The DCO is used for generating an output frequency signal. The comparing unit receives a Keep Alive signal or a start of a frame (SOF) from a universal serial bus (USB) and the output frequency signal, and compares the Keep Alive signal or the start of a frame (SOF) with the output frequency signal to generate a calibration signal. Then, the DCO adjusts the frequency of the output frequency signal according to the calibration signal to meet the USB specification for data communication.
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