【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.更多还原

【Abstract】 This paper describes a new 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.更多还原