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A 475 mV 49 GHz Enhanced Swing Differential Colpitts VCO With Phase Noise of -1
一种新型增强摆幅差分Colpitts VCO，适用于低压操作，振荡超出电源电压和地。
4.9 GHz, 1.9-3 mW, 400-500 mV, -132.6 to -136.2 dBc/Hz @3MHz
Colpitts VCO低压操作相位噪声差分振荡CMOS
▸创新点1：增强摆幅差分Colpitts架构通过独特的电路设计使振荡幅度超越电源电压和地电位，实现了在475 mV超低供电电压下的稳定振荡，突破了传统Colpitts振荡器的摆幅限制（方法创新）
▸创新点2：低压操作能力通过优化偏置点和采用增强型差分结构，在400-500 mV供电范围内仅消耗1.9-3 mW功率，显著降低了功耗同时保持49 GHz高频振荡（电路创新）
▸创新点3：提出的完整振荡器分析模型包含起振条件、差分/共模振荡模式及振幅理论推导，为超低压VCO设计提供了系统级设计准则（理论创新）
▸创新点4：实测相位噪声达到132.6-136.2 dBc/Hz@3MHz偏移，在亚阈值电压域实现了接近常规供电VCO的噪声性能（性能创新）
Abstract
A new enhanced swing differential Colpitts VCO ar-
chitecture enables oscillations to go beyond both the supply voltage
and ground making it suitable for low voltage operation. Analysis
for the oscillation frequency, differential- and common-mode
oscillations, amplitude of oscillation, and start-up condition pro-
vides insight into oscillator operation and design considerations.
Operating at 4.9 GHz, the VCO consumes from 1.9 mW to 3 mW
for supply voltages of 400 mV and 500 mV , respectively. Th