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A Study of Phase-Noise Characteristics of Fr Oscillator Focusing on Output Position
Takeshi Imaike,Yukinori Sakuta,Yoshifumi Sekine 대한전자공학회 2007 ITC-CSCC :International Technical Conference on Ci Vol.2007 No.7
This paper reports the relation of phase-noise characteristics to signal output position of Fr oscillator. As a result, it became clear the slope of phase-noise is same property. However, it turned out the spurs condition depends on the signal output position.
Characteristics of Oscillator Circuit satisfying Impedance Matching Condition
Masato Ogawa,Takeshi Imaike,Yukinori Sakuta,Yoshifumi Sekine 대한전자공학회 2009 ITC-CSCC :International Technical Conference on Ci Vol.2009 No.7
Many studies for improving the phase noise characteristic are based on evaluating the characteristics of designed circuit. Because the oscillator acts as a nonlinear positive feedback circuit, it is difficult to estimate the oscillation frequency and amplitude accurately. Then, we proposed the Fr oscillator circuit which satisfied the impedance matching requirement. We believe that the effective approach can be examined if the behavior of the element in the oscillator circuit can be understood by the open circuit of this circuit. This paper describes that the characteristic of the open circuit of the Fr oscillator is corresponding to it of the closed circuit well.
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.