介绍了指数函数传统的FPGA实现方法,分析其硬件开销及运算精度。在此基础上,基于Simulink开发工具,提出了一种运用查找表思想在FPGA上实现指数函数的新方法。该方法具有硬件资源消耗少,自变量输入范围宽,运算精度可控等优点。 Introduced the exponential function of the traditional FPGA implementation methods, analysis of its hardware overhead and operational accuracy. On this basis, based on the Simulink development tools, a new method of using look-up table to implement exponential function in FPGA is proposed. The method has the advantages of less hardware resource consumption, wide input range of arguments, controllable precision and so on.