Patent ID: 7009459

Claim:
A piezoelectric oscillator comprising a piezoelectric vibrator that has a piezoelectric element which is excited in a predetermined frequency, an oscillation amplifier transistor that excites the piezoelectric element by flowing a current to the piezoelectric element, a combined capacitor that is connected between a base of the oscillation amplifier transistor and the ground and that forms a part of a load capacitance, and an emitter resistor that is inserted between an emitter of the oscillation amplifier transistor and the ground, wherein a non-inductive load is connected to a collector of the oscillation amplifier transistor, and a capacitor is inserted between the collector and the emitter of the oscillation amplifier transistor; the combined capacitor is composed of a capacitor that is connected between the base and the emitter of the oscillation amplifier transistor and a capacitor that is connected between the emitter and the ground, and the base of the oscillation amplifier transistor is biased at a predetermined potential; and the capacitance of the capacitor inserted between the collector and the emitter is at or above the capacitance of the capacitor inserted between the emitter of the oscillation amplifier transistor and the ground.