一种基于锁相环梳状谱发生器的设计  

Design of a Comb Generator Based on PLL

作　　者：刘汉子 石玉 张玮 LIU Hanzi;SHI Yu;ZHANG Wei(School of Electronic Science and Engineering,University of Electronic Science and Technology of China,Chengdu 611731,China)

机构地区：[1]电子科技大学电子科学与工程学院

出　　处：《电子科技》2020年第3期21-25,共5页Electronic Science and Technology

基　　金：国家自然科学基金(61471086)~~

摘　　要：针对传统模拟梳状谱发生器难以实现高平坦度、窄间距、灵活操控的缺陷,文中提出了一种基于锁相环机理实现梳状信号的新方式。该方法利用锁相环反馈回路的N分频器对压控振荡器输出的高频信号进行分频以得到脉冲宽度窄的脉冲信号,然后再令其通过滤波器得到满足目标带宽的高平坦度梳状谱信号。通过对分频器进行灵活编程控制可以得到不同间距的谱线,且不需要修改硬件电路设计。实验结果表明,这种基于锁相环机理及的梳状谱发生器所产生的谱线具备信号带宽大、幅度一致性高、间距可调、小型化、低功耗等优点。It is difficult for the traditional analog comb generator to achieve high flatness,small frequency spacing and flexible adjustment.This study proposed a new way to realize comb signal based on phase-locked loop mechanism.Specifically,the output of the N divider in the phase-locked loop feedback branch generated a pulse signal with a narrow pulse width by dividing high frequency signal of the voltage-controlled oscillator.The pulse passed through the filter to obtain a high-flatness comb signal that satisfies the target bandwidth.By flexible programming control of the divider,the comb signal with different frequency spacing was obtained without modifying the hardware circuit design.The experimental results showed that the spectral line generated by the comb spectrum generator based on PLL had the advantages of large signal bandwidth,high amplitude uniformity,adjustable frequency spacing,miniaturization and low power consumption.

关 键 词：梳状谱发生器 锁相环 信号带宽大 幅度一致性高 间距可调 小型化低功耗 

分 类 号：TN784+.1[电子电信—电路与系统]