低相位噪声、宽调谐范围LC压控振荡器设计  

Design of low phase-noise, wide band LC VCO

作　　者：曾健平[1] 谢海情[1] 晏敏[1] 曾云[1] 彭伟[1] 

机构地区：[1]湖南大学物理与微电子科学学院

出　　处：《电路与系统学报》2008年第4期135-138,共4页Journal of Circuits and Systems

基　　金：湖南省自然科学基金资助项目(05JJ30115)

摘　　要：基于开关电容和MOS可变电容相结合的电路结构，设计了一种分段线性压控振荡器，很好地解决了相位噪声与调谐范围之间的矛盾。另外，在尾电流源处加入电感电容滤波，进一步降低相位噪声。采用TSMC0．18μmCMOS工艺，利用Cadence中的SpectreRF对电路进行仿真，当电源电压VDD=1．8V时，其中心频率为1．8GHz，可调频率为1．430-2．134GHz，调谐范围达到37％，在偏离中心频率1MHz处，相位噪声为-131dBc／Hz，静态工作电流为5．2mA。In order to solve the problem between phase noise and tuning range, a piecewise linear VCO is designed based on the structure of combination of switching-capacitance and MOS varactor. In addition, LC noise filter is added in the tail current source to lower phase noise further more. The circuit is designed in TSMC 0.18μm CMOS process, and simulated by the SpectreRF in Cadence under supply voltage of 1.8V. The central frequency of the VCO is 1.8G.Hz The output frequency ranges from 1.430GHz to 2.134GHz, and tuning range is up to 37%. Phase noise is -131 dBc/Hz at an offset of 1MHz. The static current of the circuit is 5.2mA.

关 键 词：压控振荡器 相位噪声 开关电容阵列 电感电容滤波 

分 类 号：TN402[电子电信—微电子学与固体电子学]