Oscillators – Automatic frequency stabilization using a phase or frequency... – With reference oscillator or source
Reexamination Certificate
2008-01-01
2008-01-01
Mis, David (Department: 2817)
Oscillators
Automatic frequency stabilization using a phase or frequency...
With reference oscillator or source
C375S376000, C713S400000
Reexamination Certificate
active
07315216
ABSTRACT:
An adjusting frequency device of built-in oscillator for USB interface and a method thereof are described. It is Auto detect the error of bit-rate between the USB host and the USB device, and produce tiny counting time for clocking the clock error between the USB host and the USB device by a delay lock loop. The clock error after quantification, digitization and operation outputting a quantitative code, then the oscillator adjusts the oscillation frequency according to the quantitative code. Whereby adjusting the oscillation frequency of the USB device and the frequency of the USB host to less than 1% clock error for ensuring the accuracy of data transmission.
REFERENCES:
patent: 6407641 (2002-06-01), Williams et al.
patent: 6954506 (2005-10-01), Cho
Lee Chien-Hsun
Liu Hsiang-Sheng
Shiau Juh-Gua
Yang Chih-Wei
Holtek Semiconductor Inc.
Mis David
Rosenberg , Klein & Lee
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