Oscillators – Automatic frequency stabilization using a phase or frequency... – Afc with logic elements
Reexamination Certificate
2007-10-16
2007-10-16
Chang, Joseph (Department: 2817)
Oscillators
Automatic frequency stabilization using a phase or frequency...
Afc with logic elements
C331S017000, C331S016000
Reexamination Certificate
active
11291841
ABSTRACT:
An auto-adjusting high accuracy oscillator is disclosed, which includes: a frequency comparator, for comparing a synchronization signal obtained from a USB host with an oscillation signal obtain from a device; a control tuning circuit, further comprising a counter and an adder/sub circuit; and an oscillating element; wherein a variation is obtained by the counting of the counter while transmitting the variation to the adder/sub circuit to be encoded thereby into a digital code so as to enable the oscillating element to perform a frequency up/down operation accordingly for approaching the synchronization signal successively.
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patent: 5511100 (1996-04-01), Lundberg et al.
patent: 6297705 (2001-10-01), Williams et al.
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patent: 6771726 (2004-08-01), Pomet
patent: 2003/0227334 (2003-12-01), Chuang et al.
patent: 2004/0148539 (2004-07-01), Leydler et al.
Huang Quan Xing
Lee Chien Hsun
Liu Hsiang Sheng
Yang Chih Wei
Chang Joseph
Holtek Semiconductor
Troxell Law Office PLLC
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