面向数控锁相环的非线性动态带宽控制算法（英文）  

A Nonlinear Dynamic Bandwidth Control Algorithm for Digitally Controlled Phase-Locked Loop

作　　者：王琛 谭红 WANG Chen;TAN Hong(College of Computer Science and Technology,Nanjing University of Technology,Nanjing 211816,China)

机构地区：[1]南京工业大学计算机科学与技术学院,南京211816

出　　处：《电子器件》2018年第2期416-420,共5页Chinese Journal of Electron Devices

摘　　要：传统的锁相环常采用动态带宽调整算法,由于鉴相器输出的相位误差和反馈时钟频率为非线性关系,动态带宽调整算法常引入错误调节。因此本文面向数控锁相环,提出了一种非线性动态带宽调整方法,较小鉴相误差只有多次出现后才调整数控锁相环带宽,避免了不必要的带宽调整。为了验证提出的算法,本文开发了数控锁相环的MATLAB行为级模型,其仿真结果表明其锁定时间下降到原方法的28.6%~85.7%。论文证明了合适的非线性控制算法更有利于降低锁定时间。A nonlinear dynamic bandwidth control algorithm is presented for digitally controlled phase-locked loop(DCPLL).Because of nonlinear relationship between sensed phase error and feedback clock frequency,there are many erroneous bandwidth adjustment in the PLL with traditional dynamic bandwidth control algorithm.The proposed algorithm adjusts the DCPLL bandwidth when small phase error has been sensed several times by the phase detector,thus it avoids unnecessary bandwidth adjustment.To verify the feasibility of the proposed algorithm,we develop a behavioral model in MATLAB.Simulation results show that the DCPLL locking time using the proposed algorithm is reduced to 28.6%~85.7%compared with the DCPLL employing the traditional algorithm.

关 键 词：数控锁相环 动态带宽调整算法 数字滤波器 锁相环行为级模型 

分 类 号：TN763[电子电信—电路与系统]