基于LabVIEW与FPGA的信号发生器设计

摘要

The sine inspire signal with high -accuracy and wide -frequency is required by eddy detect instrument.Therefore,a signal generator based on DDS technology is designed.The design of the structure,the basic principle,the software and the hardware of the signal generator is analyzed in detail. The simulation result based on SignalTabII and the test of the hardware circuit is given to show performance of the signal generator.Aiming to a better operating experience,a upper computer software based on LabVIEW is designed to control the lower computer by SPI.Finally,the experimental result demonstrates that the method is effective and has practical values.%涡流检测仪器的探头需要高精度、频率可调的正弦激励信号。因此以FPGA （现场可编程门阵列）为核心，基于DDS（Direct Digital Synthesizer）技术设计了一种信号发生器，详细分析了该信号发生器的整体结构、基本原理、软硬件设计，并给出基于SignalTabII的仿真结果以及实际电路的测试结果。该信号发生器利用LabVIEW开发上位机软件，通过串口通信实现对下位机的控制，人机界面友好。实验证明，该方案行之有效，具有实际应用价值。