基于FPGA自适应数字频率计的设计

Auto-adjusting digital cymometer based on FPGA

介绍一种以FPGA(Field Programmable Gate Array)为核心,基于硬件描述语言VHDL的数字频率计设计与实现。在介绍频率测量的原理和测量方法的基础上,针对所设计的频率计需简单易用的要求,采用FPGA和简单的外围电路使系统具有体积小、可靠性高、灵活性强及价格低廉等特点,同时还具有易于升级的特点。

This paper introduced a kind of design of cymomcter which based on FPGA （Field Programmable Gate Array） and Hardware Description Language. It also introduced the theory and the method of the measure of the frequency. The system adopted FPGA and simple peripherally circuit to make the design simple and easy to use. ＇The system has characteristics of small buck, high reliability, flxible and the cost is low too. At the sarae time the system can be updated easily.