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Tail Current-Shaping to Improve Phase Noise in LC V oltage-Controlled Oscillator
通过尾电流整形技术提升LC-VCO的振幅并降低相位噪声，同时保持功耗不变。
2-GHz, 0.25-μm BiCMOS
LC压控振荡器相位噪声尾电流整形功耗优化BiCMOS工艺
▸尾电流在输出相位对噪声敏感度最低时增大，敏感度高时减小
▸不增加额外功耗和噪声源
▸电路设计面积小且无需额外有源器件
Abstract
This paper introduces a tail current-shaping tech-
nique in LC-VCOs to increase the amplitude and to reduce the
phase noise while keeping the power dissipation constant. The tail
current is made large when the oscillator output voltage reaches
its maximum or minimum value and when the sensitivity of the
output phase to injected noise is the smallest; the tail current is
made small during the zero crossings of the output voltage when
the phase noise sensitivity is large. The phase noise contribut