基于CPLD的等精度频率计的设计

The project of frequency based on CPLD

在电子领域中,测频是经常要用到的。但是传统频率计在测频时有很多缺点。本设计采用等精度测频、测周期的数字频率计的设计方案,选用单片机为核心,通过编程实现了闸门预制信号、同步控制、数据运算处理和实时显示的功能,并利用可编程逻辑器件CPLD(Complex Programmable Logic Device)的在线编程,实现了频率计的逻辑控制、计数等功能。本设计克服了传统频率计随着被测频率的改变而改变的缺点,在整个频率区域都能保持恒定的测试精度。

In the areas of detection is often used in perfumes, but the traditional test of frequency in frequency as a great many faults. This design adopts the zero, and frequency of the cycle of digital frequency of use monolithic integrated circuits design, the programming through the valve modules, synchronization control and data processing and real-time the function, and use of the programmable logic devices cpld （ complex programmable logic device ） online programming, the frequency of logic to control functions, count, etc. This design overcomed the traditional frequency as is the test of frequency of changes in the whole area will remain constant frequency of accuracy tests.