Improvement of Phase Noise Close to Carrier Frequencies in Narrow-Band Colpitts Oscillators

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  • 狭帯域コルピッツ発振回路におけるキャリア近傍位相雑音の改善
  • キョウタイイキ コルピッツ ハッシン カイロ ニ オケル キャリア キンボウ イソウ ザツオン ノ カイゼン

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This paper describes an analysis of the close to carrier phase-noise characteristics of the narrow-band Colpitts oscillators. The open-loop impedance, that is, series of the SC-cut resonator and the oscillator active circuit, is calculated using a linear circuit model with a non-linear transistor model. It is shown that the loaded Q can be improved by introducing the resonator filter in the oscillation circuit. Based on the Leeson's model, the near carrier phase-noise is estimated using the calculated Q values. The results corresponded well with the previous experiments. It is also shown that the phase-noise can be exceedingly improved, that is, under -148 dBc/Hz at 10Hz offset, by using resonator filter with high Q.

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