Patent ID: 7378916

Claim:
A 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 filtering the oscillator signal with a secondary oscillation mode, which is one of the oscillation modes, from the output of the crystal unit; a quaternary resonator unit filtering the oscillator signal, bearing a different resonance frequency from that of the tertiary resonator unit, with the secondary oscillation mode from the output of the crystal unit; and a secondary phase synthesis unit, synthesizing the phases of the output signal of the tertiary resonator unit and the output signal of the quaternary resonator unit, wherein the primary phase synthesis unit and the secondary phase synthesis unit are a differential amplifier.