Frequency-locking device and frequency-locking method thereof
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United States of America Patent
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Dec 15, 2009
Grant Date -
May 1, 2008
app pub date -
Feb 15, 2007
filing date -
Nov 1, 2006
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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 from a universal serial bus (USB) and the output frequency signal, and compares the Keep Alive signal 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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