外部水晶共振回路を用いた発振器の位相雑音低減手法

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  • Phase Noise Improvement Techniques for Oscillator Circuit Using External Crystal Resonant Circuit
  • ガイブ スイショウ キョウシン カイロ オ モチイタ ハッシンキ ノ イソウ ザツオン テイゲン シュホウ

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This paper describes a new techniques of reducing phase noise in oscillator circuits. Our method uses an external crystal resonant circuit that acts as a frequency reference and is based on correlation with negative feedback control. We present the circuit configuration and the transfer function used in this method, as well as measured single sideband (SSB) phase noise characteristics. Our experiments show that phase noise can be decreased as it is a theoretical value when using LC oscillator. Furthermore, we examine application for voltage controlled crystal oscillator (VCXO). As a results, we can improve that the phase noise characteristics more than that of original VCXO without spoiling frequency tuning range of VCXO.

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