Auto-adjusting high accuracy oscillator

Details Auto-adjusting high accuracy oscillator Auto-adjusting high accuracy oscillator

2007-08-30

2009-06-02

Chang, Joseph (Department: 2817)

Oscillators

Automatic frequency stabilization using a phase or frequency...

Afc with logic elements

C331S016000, C331S017000

Reexamination Certificate

active

07541877

ABSTRACT:
An auto-adjusting high accuracy oscillator is disclosed, which comprises: 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.

REFERENCES:
patent: 6297705 (2001-10-01), Williams et al.
patent: 6407641 (2002-06-01), Williams et al.
patent: 6771726 (2004-08-01), Pomet
patent: 2003/0227334 (2003-12-01), Chuang et al.
patent: 2004/0148539 (2004-07-01), Leydier et al.

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