小数频率合成器噪声传函及动态特性建模仿真  

Modeling and simulation for fractional N frequency synthesizer noise and dynamics analysis

作　　者：胡悦[1] 李章全[1] 周健军[1] 

机构地区：[1]上海交通大学微电子学院,上海200240

出　　处：《信息技术》2008年第7期40-43,46,共5页Information Technology

摘　　要：对采用Δ-Σ小数分频频率合成器(Δ-ΣPLL)中离散采样行为进行了深入研究,提出了混合信号系统的传输函数表达式,并将该表达式运用在现有的锁相环时域模型之上,获得了环路中量化噪声以及压控振荡器(VCO)的噪声传输函数模型。此外,论述了一种简化计算方法用于获得三阶锁相环动态参数,并对Δ-ΣPLL噪声和闭环带宽的折衷进行了建模与仿真。The sample operation within a fractional N frequency synthesizer is closely investigated; one expression of transfer function for mixed signal system is proposed and employed on the fractional N synthesizer for an accurate modeling and noise analysis. The methods for simplification of dynamics analysis and parameter calculation, noise performance simulation are also proposed.

关 键 词：小数频率合成 混合信号系统 动态分析 噪声特性 

分 类 号：TN772[电子电信—电路与系统]