Active-Impedance Analysis of Narrow-Band Crystal Oscillators with Resonator Filters and Its Application to Dual-Mode Crystal Oscillators
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概要
- 論文の詳細を見る
This paper describes a method for analyzing active impedance, i.e. equivalent resistance and equivalent reactance, of a narrow-band transistor Colpitts crystal oscillator. This oscillator, employing an AT-cut resonator filter, has a very narrow-band width and an achievement of extremely low phasenoise characteristics is expected. The analysis proposed is based on an algebraic formula, which employs a nonlinear approximation for transistor g_m, and a simplified circuit model. Calculated results are compared with the experimental results in the frequency characteristics of the oscillator active impedance with changing the driving signal current. Good agreement between the calculation and experimental results shows that the proposed technique is suitable for designing Colpitts crystal oscillators with resonator filters. In addition we apply this technique to the analysis of dual-mode crystal oscillators.
- 社団法人電子情報通信学会の論文
- 1998-02-25
著者
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Sekimoto Hitoshi
Tokyo Metropolitan University
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Goka Shigeyoshi
Tokyo Metropolitan University
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NIIMI Ikuo
System design section, Hitachi Ltd.
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WATANABE Yasuaki
the Department of Electrical Engineering, Graduate School of Engineering, Tokyo Metropolitan Univers
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SEKIMOTO Hitoshi
the Department of Electrical Engineering, Graduate School of Engineering, Tokyo Metropolitan Univers
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GOKA Shigeyoshi
the Department of Electrical Engineering, Graduate School of Engineering, Tokyo Metropolitan Univers
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Niimi Ikuo
System Design Section Hitachi Ltd.
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Watanabe Yasuaki
Graduate School of Science and Engineering, Tokyo Metropolitan University
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