OSCILLATION CIRCUIT AND ANGULAR VELOCITY SENSOR

PROBLEM TO BE SOLVED: To realize an oscillation circuit which widely deals with characteristic variations in oscillators and is excellent in stability, and to provide a precise angular velocity sensor employing the oscillation circuit. SOLUTION: The oscillation circuit comprises a crystal oscillator...

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Bibliographische Detailangaben
1. Verfasser:	KOMINE SHINICHI
Format:	Patent
Sprache:	eng
Schlagworte:	BASIC ELECTRONIC CIRCUITRY ELECTRICITY GENERATION OF NOISE BY SUCH CIRCUITS GENERATION OF OSCILLATIONS, DIRECTLY OR BY FREQUENCY-CHANGING,BY CIRCUITS EMPLOYING ACTIVE ELEMENTS WHICH OPERATE IN ANON-SWITCHING MANNER GYROSCOPIC INSTRUMENTS MEASURING MEASURING DISTANCES, LEVELS OR BEARINGS NAVIGATION PHOTOGRAMMETRY OR VIDEOGRAMMETRY PHYSICS SURVEYING TESTING
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Beschreibung
Zusammenfassung:	PROBLEM TO BE SOLVED: To realize an oscillation circuit which widely deals with characteristic variations in oscillators and is excellent in stability, and to provide a precise angular velocity sensor employing the oscillation circuit. SOLUTION: The oscillation circuit comprises a crystal oscillator 2 having drive electrodes 3, 4, a current-to-voltage converting circuit 7 for converting output current of the drive electrodes of the crystal oscillator 2 into an AC voltage, a variable gain amplifier 10 for amplifying an AC signal output from the current-to-voltage converting circuit 7, a fixed gain amplifier 11 for amplifying the AC signal output from the current-to-voltage converting circuit 7, and an AGC circuit 9 for controlling the output current of the crystal oscillator so as to be constant. The fixed gain amplifier 11 is equipped with a switch circuit for switching at least two gains. The stable oscillation circuit is thereby realized. COPYRIGHT: (C)2007,JPO&INPIT