Oscillators – With frequency calibration or testing
Reexamination Certificate
2006-04-18
2006-04-18
Chang, Joseph (Department: 2817)
Oscillators
With frequency calibration or testing
C331S158000, C331S176000
Reexamination Certificate
active
07030706
ABSTRACT:
The present self-calibratable oscillating device includes a phase comparator, a clock pad electrically connected to a first input port of the phase comparator, a crystal oscillator electrically connected to a second input port of the phase comparator, an analog/digital converter electrically connected to an output port of the phase comparator, and a memory electrically connected to an output port of the analog/digital converter. The crystal oscillator can be a temperature-compensated crystal oscillator or a surface acoustic wave crystal oscillator. The present self-calibratable oscillating device can further includes a first switch positioned between the first input port of the phase comparator and the clock pad, a second switch positioned between the crystal oscillator and the clock pad wherein the stream direction of the first switch is in reverse of that of the second switch, and a logic control device for controlling the first switch and the second switch.
REFERENCES:
patent: 5172075 (1992-12-01), Yerbury et al.
patent: 5892408 (1999-04-01), Binder
patent: 5912595 (1999-06-01), Ma et al.
patent: 373389 (1999-11-01), None
patent: 397307 (2000-07-01), None
Chang Joseph
Egbert Law Offices
Elite Semiconductor Memory Technology Inc.
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