可自适应调节带宽的新型非线性二阶锁相环  

A Novel Second Order Phase Locked Loop with Adaptive Adjusted Bandwidth

作　　者：赵蕾[1,2] 石磊 朱从莹 姚博 ZHAO Lei;SHI Lei;ZHU Congying;YAO Bo(School of Information,Xi’an University of Finance and Economics,Xi’an 710100,China;School of Aerospace Science and Technology,Xidian University,Xi’an 710071,China)

机构地区：[1]西安财经学院信息学院,陕西西安710100 [2]西安电子科技大学空间科学与技术学院,陕西西安710071

出　　处：《电子科技》2019年第1期1-4,10,共5页Electronic Science and Technology

基　　金：国家自然科学基金(61473228;61301173);陕西省自然科学基金(2016JM06);西安财经学院科学研究扶持计划(16FCJH03)~~

摘　　要：大捕获带宽的同步给传统二阶锁相环带来了巨大挑战。文中针对传统锁相环捕获带宽与抑制噪声能力两者之间的矛盾,提出一种耦合非线性环节的新型二阶锁相环,利用非线性模块自适应调整环路噪声带宽。输入输出相位误差较大时利用较大的带宽迅速减小频偏;当相位误差由于环路控制作用而减小时,利用较小的带宽抑制噪声以提高跟踪精度。仿真结果表明,非线性二阶锁相环跟踪速度显著提高,且相比传统二阶锁相环,捕获带宽从4 kHz最大提高到18. 8 kHz。The large acquisition bandwidth presents a significant challenge to traditional second-order phase locked loops.On the basis of the contradiction of larger acquisition bandwidth and noise reduction capabilities,a novel second-order PLL which was coupled with a nonlinear element,was introduced in this paper.The loop noise bandwidth was adaptively adjusted by the nonlinear element.The frequency error was reduced more quickly with a larger bandwidth when the frequency error was large.By contrast,the noise was suppressed with a smaller bandwidth to improve the tracking accuracy when the frequency error was reduced due to the control effect of the loop.The simulation results indicated that the tracking speed of the proposed nonlinear second order PLL was significantly increased and the acquisition bandwidth was increased from4kHz to18.8kHz.

关 键 词：锁相环 捕获带宽 跟踪精度 自适应 频率相位误差 环路噪声带宽 

分 类 号：TN92[电子电信—通信与信息系统]