电感电容压控振荡器调谐曲线的时域分析  

Time-Domain Analysis of LC-VCOs' Tuning Curves

作　　者：唐长文[1] 何捷[1] 菅洪彦[1] 张海青[1] 闵昊[1] 

机构地区：[1]复旦大学专用集成电路与系统国家重点实验室,上海200433

出　　处：《电子学报》2005年第8期1467-1472,共6页Acta Electronica Sinica

基　　金：上海市科学技术委员2003年度集成电路设计科技专项(No.037062019);上海-应用材料研究与发展基金(No.0425)

摘　　要：本文提出了一种基于周期计算技术的压控振荡器频率-电压调谐曲线的分析方法.在传统的谐波平衡近似方法中,通过大信号非线性分析方法可以计算出一个周期内可变电容的有效电容值.然而通过有效电容推导的调谐曲线并不准确,况且如果高阶谐波分量不可以忽略的话,谐波平衡近似分析方法将会变得很复杂.本文提出的周期计算方法所得到的振荡调谐曲线比传统谐波平衡近似分析方法更加精确.在0.35μm2P4MCMOS工艺上实现的电感电容压控振荡器的实验测试证明了该理论分析的正确性.This paper describes a now analytical method of tuning curves of a LC-tank voltage-controlled oscillator （VCO） with period calculation technique. In traditional analysis method, the harmonic approximation is employed, and an effective capacitance of varactors during one period is calculated by the large-signal nonlinear analysis. However, the oscillator tuning curve derived from the effective capacitance is inaccurate, and complex if higher order harmonics could not be neglected. In this paper a novel convenient method of calculating oscillating period is proposed. With this period calculation technique, the prediction of oscillator tuning curves is more accurate compared with the traditional harmonic approximation. The theoretical analyses are experimentally validated with a CMOS complementary LC-tank VCO implemented in 0.35μm 2P4M CMOS process.

关 键 词：MOS管可变电容 电感电容回路 压控振荡器 累积型MOS管 振荡调谐曲线 

分 类 号：TN4[电子电信—微电子学与固体电子学]