Dual mode tuning digitally controlled crystal oscillator and...

Details Dual mode tuning digitally controlled crystal oscillator and... Dual mode tuning digitally controlled crystal oscillator and...

2006-02-23

2008-08-26

Pascal, Robert J. (Department: 2817)

Oscillators

Electromechanical resonator

Crystal

C331S1160FE, C331S17700V, C331S17700V

Reexamination Certificate

active

07417512

ABSTRACT:
A dual mode tuning digitally controlled crystal oscillator includes a crystal resonator, an oscillation circuit, a coarse mode tuning unit and a fine mode tuning unit. The crystal resonator resonates at substantially a predetermined resonance frequency. The oscillation circuit generates an oscillation frequency based on the resonance frequency to output the oscillation frequency. The coarse mode tuning unit performs a coarse mode tuning operation on the oscillation frequency in response to a coarse mode tuning signal, and the fine mode tuning unit performs a fine mode tuning operation on the oscillation frequency in response to a fine mode tuning signal, to substantially compensate for a frequency error of the crystal resonator. The coarse mode tuning control unit controls the coarse mode tuning signal to output a controlled coarse mode tuning signal to the coarse mode tuning unit, in response to the fine mode tuning signal.

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