基于FPGA与单片机的等精度频率计的设计

根据等精度测量原理，设计了一种基于FPGA和单片机的等精度频率计。系统主要包括信号预处理电路、单片机控制电路、FPGA测频电路和显示电路等。被测频率信号和标准频率信号经过整形放大处理后输入FPGA．单片机控制FPGA对两路信号进行计数并读取测频数据，单片机将读取的测频数据经过运算处理后显示。测试结果表明，该频率计实现了整个频率测量范围内的测量精度相等，测量精度高，稳定性好。

Design of equal precision cymometer based on FPGA and SCM

According to the principle of equal precision measurement, a cymometer was designed based on FPGA and singlechip microcomputer. This system was mainly composed of the signal amplification shaping circuit,single-chip microcomputer control circuit,FPGA frequency measurement circuit and the signal display circuit. After amplification and rectification, the signal to be measured and the standard signal were input into FPGA. Two signals were counted in FPGA and controlled by single-chip microcomputer. After received the measuring frequency data, single-chip microcomputer calculated and processed it, and the result of measure was shown. The experiments show that, the cymometer has equal measurement accuracy within the whole frequency measuring range, and it has the advantages of high measuring precision and good operation stability.