基于FPGA的三通道函数信号发生器

采用Actel公司的Fusion系列AFS600 混合信号,FPGA结合外部D/A设计了一种直接数字频率合成高精度三通道相位可调函数信号发生器。以单片机和键盘液晶屏实现人机接口,通过串行口将设置参数传输给FPGA,在FPGA内部实现各种信号的合成运算,最后通过高速D/A转换和信号调理获得输出,可实现正弦、三角、锯齿、PWM等信号输出,通道间相位可调。各种功能均进行了实验测定,达到了预期设计要求。

Three-channel Function Signal Generator Based on FPGA

This project adopts the DDS （Direct Digital Synthesis） technology to design a high-precision three- channel phase-adjustable function signal generator, with external D/A devices and AFS600 mixed-signal FPGA of FUSION Series manufactured by Actel Corporation. This function signal generator transmits parameters to the FPGA through the serial port, implementing the Synthesis operation of all kinds of signals, with the MCU, LCD screen and keyboard as man-machine interface. With the High-speed D/A Converter and signal conditioner, this signal generator is capable of desired high-precision phase-adjustable function signal outputs, such as sine, triangle, saw-tooth, and PWM signals. All the functions mentioned above are tested, which show that they meet the design requirements.