基于FPGA的数字频率计设计

摘要

随着电子技术的发展，快速准确获得各种电子信号的频率显得越来越重要。但传统的频率计大多采用单元电路或单片机进行设计，存在测频范围窄，测量精度低，操作复杂和功能单一等问题。此数字频率计主要由AGC模块、整形模块、FPGA处理及显示模块组成，利用时钟脉冲计数的方式，实现正弦波和矩形波信号的频率、矩形波信号的占空比和输入的两路同频周期矩形波信号时间间隔的测量功能。该数字频率计测频范围宽，测量精度高，操作简单，稳定可靠。%As the development of electronic technology, it's more and more important to obtain accurate frequencies of various kinds of electronic signals rapidly. But traditional cymometer is mainly designed by unit circuits or SCM (Single Chip Microcomputer),which has narrow frequency measurement range and low measurement accuracy. The digital cymometer is made up of AGC module, plastic module, disposing and displaying module. It has functions of frequency measuring, duty ratio measuring and time interval measuring by clock counting. The digital cymometer is stable and accessible. The digital cymometer has wide frequency measurement range and high measurement accuracy.