Driver device, physical quantity measuring device, and...

Details Driver device, physical quantity measuring device, and... Driver device, physical quantity measuring device, and...

2007-10-12

2010-10-12

Chang, Joseph (Department: 2817)

Oscillators

Electromechanical resonator

Crystal

C331S1160FE

Reexamination Certificate

active

07812681

ABSTRACT:
An oscillation driver circuit includes a gain control amplifier which causes a vibrator to produce driving vibrations by controlling an oscillation amplitude in an oscillation loop, and a comparator which generates a synchronous detection reference signal based on a signal in the oscillation loop. The comparator has an output current limiting function. The oscillation driver circuit causes the vibrator to produce vibrations using an output from the comparator in a state in which the gain in an oscillation loop formed by the vibrator and the comparator is set to be larger than unity, and then causes the vibrator to produce the driving vibrations by controlling an oscillation amplitude in an oscillation loop formed by the vibrator and the gain control amplifier.

REFERENCES:
patent: 5041800 (1991-08-01), Long et al.
patent: 7089793 (2006-08-01), Yokoi et al.
patent: A 2003-240556 (2003-08-01), None
patent: A 2004-286503 (2004-10-01), None

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