一种带有开关电流源的低相噪压控振荡器-太赫兹科学与电子信息学报.PDF

第 12 卷 第 3 期 太赫兹科学与电子信息学报 Vol.12，No.3 2014 年 6 月 Journal of Terahertz Science and Electronic Information Technology Jun.，2014 文章编号：2095-4980(2014)03-0466-05 一种带有开关电流源的低相噪压控振荡器 吕志强，陈 岚 ( 中国科学院 微电子研究所，北京 100029) 摘 要 ：提出一种带有开关电流源的电感电容压控振荡器(LC VCO) 。该技术通过反馈电容将 电感电容压控振荡器的输出耦合到电流源，形成了电流源的开关特性，从而减小了电感电容压控 振荡器的相位噪声。提出的电感电容压控振荡器采用华虹 NEC 的 0.18 μm SiGe BiCMOS 工艺，工 作频率为 5.7 GHz ，相位噪声为-113.0 dBc/Hz@1MHz ，功耗为 2.3 mA 。在其他性能相同的情况 下，提出的电感电容压控振荡器的振荡频率比典型的电感电容压控振荡器的相位噪声小 4.5 dB 。 关键词 ： 电感电容压控振荡器；开关电流源；振荡频率；相位噪声 中图分类号 ：TN433 文献标识码 ：A doi ：10.11805/TKYDA201403.0466 A low phase noise VCO with switched current source LV Zhi-qiang，CHEN Lan (Institute of Microelectronics，Chinese Academy of Sciences，Beijing 100029，China) Abstract： An Lnductor-Capacitor Voltage-Controlled Oscillator(LC VCO) with the switched current source circuit is proposed. The switched current source circuit is built by the coupling capacitors between the resonant circuit and the current source circuit, and then the phase noise of the proposed LC VCO is decreased. The proposed LC VCO is implemented in the Huahong NEC SiGe 0.18 μm BiCMOS process, and its oscillation frequency is 5.70 GHz and phase noise is -113.0 dBc/Hz@1MHz with 2.3 mA DC current consumption. The measured results demonstrate that the phase noise of the proposed LC VCO is reduced by 4.5 dB compared to that of the typical LC VCO under the same conditions. Key words： inductor-capacitor Voltage-Cont