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基于FPGA的多通道模拟量采集电路设计

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针对机载系统多通道模拟量采集处理的要求,研究了基于FPGA的多通道模拟量采集电路的设计。介绍了针对模拟量采集的前端信号调理电路的设计,包括滤波电路和双向限幅电路等。同时研究了利用FPGA控制多级多路模拟开关,通过轮转和多次测量等方法实现模拟信号到数字信号的高精度转换和记录,分析了设计电路的特性,包括高精度、高可靠性和多通道数等优点。最后经过实验测试,系统能够很好地实现多通道模拟量采集的需求,同时具有很高的转换精度。

In allusion to the requirement of multi-channel analog acquisition for airborne system,this paper proposes a circuit of multi-channel analog acquisition. A front-end signal conditioning circuit was designed for the analog acquisition,including filter circuit and the bipolar diode limiter circuit. Multistage multiplex switches control method with multiple measurements and polling way using FPGA is proposed to realize the conversion and record of analog signal to digital signal. Theoretical analysis shows that the proposed circuit has the advantages in acquisition precision,reliability and the multi-channel ability. Experimental results show that the system can meet the requirement of multi-channel analog acquisition well and has hi...