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

2011-01-11

2011-01-11

Puente, Eva Y (Department: 2611)

Pulse or digital communications

Testing

Phase error or phase jitter

C375S327000, C375S376000, C375S260000, C375S219000, C331S002000, C331S016000, C331S017000, C331S044000

Reexamination Certificate

active

07869492

ABSTRACT:
The invention proposes a simple method suitable for automatically locking frequency during USB data communication. Based on the soft plug/unplug concept proposed in the contents and the error handling mechanism defined in the USB specification, we can calibrate the clock frequency of the digitally controlled oscillator (DCO), through the token packets, to be within the acceptable frequency when USB device is attached to the host controller.

REFERENCES:
patent: 7633348 (2009-12-01), Lin et al.
patent: 2002/0036545 (2002-03-01), Fridi et al.
patent: 2006/0064522 (2006-03-01), Weigold et al.
patent: 2008/0123726 (2008-05-01), Lin et al.
patent: 2008/0130729 (2008-06-01), Chapman et al.
patent: 2009/0041104 (2009-02-01), Bogdan
patent: 2009/0222685 (2009-09-01), Foster et al.

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