Crystal oscillator device, oscillation method and heater

Oscillators – Electromechanical resonator – Crystal

Reexamination Certificate

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Details

C331S060000, C331S162000, C310S361000

Reexamination Certificate

active

07378916

ABSTRACT:
The crystal oscillator device for simultaneously generating oscillator signals with a plurality of oscillation modes of a crystal unit, comprising: a primary resonator unit filtering the oscillator signal with a primary oscillation mode, which is one of the oscillation modes, from the output of the crystal unit, a secondary resonator unit filtering the oscillation signal, bearing a different resonance frequency from that of the primary resonator unit, with the primary oscillation mode from the output of the crystal unit, a primary phase synthesis unit, synthesizing the phases of the output signal of the primary resonator unit and the output signal of the secondary resonator unit, a tertiary resonator unit, a quaternary resonator unit, and a secondary phase synthesis unit.

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R. Karlquist et al.; “A Low-Profile High-Performance Crystal Oscillator for Timekeeping Applications”; Proceeding of the IEE Int'l. Frequency Control Symposium; pp. 1-12, 28-30; May 1997.
Watanabe et al.; “Highly Stable and Low Phase-Noise Oven-Controlled Crystal Oscillators (OCXOS) Using Dual-Mode Excitation”; IEICE Transactions on Fundamentals of Electronics, vol. E85-A, No. 2, pp. 329-334; Feb. 2002.
Watanabe et al.; “A Dual Mode Oscillator Based on Narrow-Band Crystal Oscillators with Resonator Filters”; IEEE International Frequency Control Symposium, pp. 932-937; May 1997.

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