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A Proposal for Frequency Stabilizing Techniques of Crystal Oscillator Circuit
Kotaro Araragi,Takeshi Imaike,Yukinori Sakuta,Yoshifumi Sekine 대한전자공학회 2007 ITC-CSCC :International Technical Conference on Ci Vol.2007 No.7
The authors propose a new frequency stabilizing method for crystal oscillator circuits. This method is made using a crystal resonant circuit. A quality factor of this crystal resonant circuit almost equal unloaded Q of a crystal resonator. Because loaded Q of a crystal oscillator is lower than unloaded Q of a crystal resonator, frequency stability of the crystal oscillator is improved by using the crystal resonant circuit as an external reference to stabilize the crystal oscillator. This paper presents a circuit configuration and transfer function of this method, and demonstrates the frequency deviation to power supply voltage. As a result, our experiments show that the fractional frequency deviation can be stabilized within ±0.1ppm in a range from the power-supply voltage 5V to ±10%. It is found that this method is effective to stabilize crystal oscillators.