基于Flash型FPGA的信号源卡设计

Signal Source Cards Design of Flash-based FPGA

介绍了一种基于Flash型FPGA的多路模拟量信号源设计方法,该系统以ACTEL公司的A3P125-VQ100芯片为核心,实现了系统的软硬件结合。它包括数模转换单元、电源模块、多路模拟开关模块以及运算放大单元等,实现了电源独立的、频率可调的、不同波形的多路模拟量信号源。该系统通过编写程序可以产生正弦波、三角波、方波以及直流波并实现1～500 Hz频率可调。研究的核心内容主要是通过FPGA控制D/A和多路模拟开关,通过D/A产生波形从多路模拟开关中送出,通过拨码开关在1～500 Hz的频率范围内控制选择,并且能够通过示波器观测到相应的频率的波形。

This paper presents a multi-source analog signal design method for flash-based FPGA; the system takes A3PI25-VQ100 chip of ACTEL Company as the core and achieves the integrating of system＇ s hardware and software. It includes digital-analog conversion module, power module, multiple modules as well as the operational amplifier analog switch modules, and achieves a multiple analog sources with power independent, different frequencies and different wave. The system can produce sine, triangle wave, square wave and wave, and implement a 1 to 500 Hz frequency adjusting. The core of this paper is mainly to control D/A and multi-channel analog switch by FPGA, send out waveform that generated through the D/A from the multi-channel analog switch, in the 1-500 Hz frequency range to control options by data-chosen-switches, and observe the waveform of the corresponding frequency through oscilloscope.