【摘要】 在设计多路信号源时，为了解决通道切换时间较长和调理电路的复杂性较高这两个问题，同时为了提高模拟信号源的精度，设计了一种基于FPGA的多路模拟信源卡。该信源卡的主控芯片为FPGA，采用PCI9054作为桥梁完成以下两项任务：上位机下发指令、硬件电路与上位机进行通信，除此之外还采用了8片4通道的DA转换芯片AD5504进行数模转换，信源卡包含了32路输出通道，每路通道输出0～28 V可调模拟电压信号，且波形和占空比均可调。经过多次实验验证，该信源卡可以输出测试系统所需的模拟电压并且输出电压的误差小于满量程的0.1%，且各通道的功率控制在0.4 W以内，输出的模拟电压信号稳定性高，满足设计需求。更多还原

【Abstract】 A multi-channel analog signal source card based on FPGA is designed to address the two issues of long switching time of channel and the complexity of conditioning circuit,while also improving the accuracy of the analog signal source. FPGA is the primary control chip of the source card,and PCI9054 serves as a bridge to accomplish the following two objectives:the upper computer dispatches commands,and the hardware circuit links up with the upper computer. In addition,8 pieces of 4-channel DA conversion chip AD5504 is used for digital-to-analog conversion. The source card contains 32 output channels,each of which outputs 0～28 V adjustable analog voltage signals,and the waveform and duty ratio are adjustable. Experiments conducted repeatedly have enabled the information source card to generate the analog voltage demanded by the test system,with an error of less than 0.2%of the entire scale,and the power of each channel kept within 0.4 W. This output analog voltage signal has a high degree of stability and fulfills the design criteria.更多还原