Frequency-locking device and frequency-locking method thereof

Details Frequency-locking device and frequency-locking method thereof Frequency-locking device and frequency-locking method thereof

2007-02-15

2009-12-15

Cho, James H. (Department: 2819)

Oscillators

With frequency calibration or testing

C327S160000, C710S100000

Reexamination Certificate

active

07633348

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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