一种低压低相位噪声的C类VCO  

A Class-C VCO with Low Phase Noise for Low Supply Voltage

作　　者：乔帅领 徐卫林[1] 段吉海[1] 韦雪明[1] 韦保林[1] 

机构地区：[1]桂林电子科技大学广西精密导航技术与应用重点实验室,广西桂林541004

出　　处：《微电子学》2017年第6期802-805,共4页Microelectronics

基　　金：国家自然科学基金资助项目(61264001);广西精密导航技术与应用重点实验室基金资助项目(DH201504);广西自然科学基金资助项目(2015GXNSFAA139301;2014GXNSFAA118386)

摘　　要：提出了一种低压低相位噪声的C类VCO电路。低压条件下,基于振幅反馈环的C类VCO存在振幅小、相位噪声差的问题,可以通过移除尾电流源、增加低通滤波器等方式来改善相位噪声。基于SMIC 0.18μm CMOS工艺,采用Cadence Spectre EDA软件对VCO进行仿真。结果表明,当载波频率为2.27GHz时,在1 MHz频偏处VCO的相位噪声为-126dBc/Hz,在供电电压为0.9V时,功耗仅为2.5mW,FOM值为-189dBc/Hz。A class-C VCO circuit exhibited a low phase noise for low supply voltage was presented.In low voltage applications,the class-C VCO with an amplitude feedback loop has the drawbacks of small amplitude and poor phase noise.A lower phase noise can be achieved by removing the tail current source and adding a low-pass filter.The proposed VCO circuit was designed in a SMIC 0.18μm CMOS process,and was simulated by the Cadence Spectre EDA software.The results showed that the proposed VCO had a phase noise of -126 dBc/Hz at 1 MHz offset from a 2.27 GHz carrier with a power consumption of 2.5 mW at 0.9 Vsupply voltage,and the FOM was -189 dBc/Hz.

关 键 词：低电源电压 相位噪声 振幅反馈 尾电流源 低通滤波器 

分 类 号：TN432[电子电信—微电子学与固体电子学]