环路滤波器中运放参数对锁相环性能影响分析  

Analysis of Influence on PLL Performance by OP AMP's Parameters in PLL Filter

作　　者：张大鹤[1] 

机构地区：[1]中国电子科技集团公司第五十四研究所,河北石家庄050081

出　　处：《无线电工程》2016年第7期64-66,88,共4页Radio Engineering

摘　　要：为了研究锁相环路滤波器中运算放大器的非理想性的影响,分析了运算放大器的单位增益带宽、等效输入噪声电压密度、输入噪声电流密度、转换速率、输入输出电压范围、稳定性、输入偏置电流和电源抑制比等参数,以及这些参数对锁相环的相位噪声、杂散和稳定性等指标的影响。对部分理论分析结果进行了试验验证,试验结果与理论分析基本一致。In order to research the influence of OP AMP＇ s non-ideal characteristics in PLL filter, some parameters of OP AMP are analyzed,including unity-gain bandwidth, input voltage noise density, input current noise density, slew rate, input/output voltage range, stability,input bias current and PSRR.The influence of the parameters on phase noise, spurious rejection and stability of the PLL is deduced.An experiment is conducted in order to verify some of the theoretical results.Experiment results are generally coincident with theoretical ones.

关 键 词：锁相环 运算放大器 频率合成 相位噪声 相位余量 杂散 

分 类 号：TN722.77[电子电信—电路与系统]