Pulse or digital communications – Synchronizers – Frequency or phase control using synchronizing signal
Reexamination Certificate
2011-05-10
2011-05-10
Payne, David C (Department: 2611)
Pulse or digital communications
Synchronizers
Frequency or phase control using synchronizing signal
C375S354000, C370S491000, C370S500000
Reexamination Certificate
active
07940876
ABSTRACT:
A universal series bus (USB) frequency synchronous apparatus using a start of frame (SOF) signal generated by a master device to mark a reference interval is disclosed. The frequency synchronizing apparatus includes a frequency divider, a counter unit with a default pulse number, an arithmetic unit, and an adjusting unit. The frequency divider divides a high frequency signal by a variable frequency factor to generate a lock frequency signal. The counter is used to detect a pulse number of the lock frequency signal at a reference interval and obtain a pulse difference between the default pulse number and the detected pulse number of the lock frequency signal.
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Hu Min-Hsiung
Lin Chuen-An
Wang Min-Kun
File Erin M
Holtek Semiconductor Inc.
Payne David C
Rosenberg , Klein & Lee
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