基于FPGA的高精度频率计  

High Precision Cymometer Based on FPGA

作　　者：董勃 王直 于航 刘博 DONG Bo;WANG Zhi;YU Hang;LIU Bo(School of Computer Science, Jiangsu University of Science and Technology, Zhenjiang 212100, China;School of Electronic Information, Jiangsu University of Science and Technology, Zhenjiang 212100, China)

机构地区：[1]江苏科技大学计算机学院,江苏镇江212100 [2]江苏科技大学电子信息学院,江苏镇江212100

出　　处：《计算机与现代化》2021年第6期96-99,106,共5页Computer and Modernization

基　　金：国家自然科学基金资助项目(51875270)。

摘　　要：为了满足硬件工程师对高精度和高带宽测频仪器的需求,设计一种基于FPGA的高精度频率计。频率计包括外围的电压跟随电路和串口通信电路以及FPGA上的分频器模块、频率计量模块和串口通信模块,并使用Altera公司的CycloneⅣ芯片作为控制核心。首先待测信号经过电压跟随器的稳压和隔离,然后将稳压信号接入分频器模块,分频器模块会把频率信号以1 kHz为界限分为低频和高频信号,并对低频信号和高频信号分别采用周期测频法和脉冲计数法测频。测量的频率数据可实时通过串口上传至上位机。经过测试,频率计能够实现1 Hz的精度、200 MHz的测频带宽以及多通道检测。In order to meet the requirements of hardware engineers for high precision and high bandwidth frequency measurement instruments,a high precision cymometer based on FPGA is designed.The frequency meter consists of peripheral voltage following circuit and serial communication circuit,frequency divider module,frequency measurement module and serial communication module on FPGA.The Cyclone IV chip of Altera company is used as the control core.Firstly,the signal to be measured is stabilized and isolated by voltage follower,and then the stabilized signal is connected to the frequency divider module.The frequency divider module divides the frequency signal into low-frequency and high-frequency signals with the limit of 1 kHz,and uses periodic frequency measurement method and pulse counting method to measure the frequency of low-frequency signal and high-frequency signal respectively.The measured frequency data can be uploaded to the upper computer through the serial port in real time.After testing,the frequency meter can achieve 1 Hz accuracy,200 MHz frequency measurement bandwidth and multi-channel detection.

关 键 词：频率计 高精度 FPGA 高带宽 

分 类 号：TP302.1[自动化与计算机技术—计算机系统结构]