基于FPGA的多通道模拟信号源设计

针对航天测试领域对模拟信号源的设计要求，提出一种新的信号源实现方法。该方法借助计算机软件能实时编程生成波形数据，通过对波形重构电路，调理电路和多通道电路的合理设计，由FPGA控制逻辑实现波形重构和多通道输出。由于方波信号沿变时具有的特殊性，设计专门的方波产生电路，通过实验验证，对原先设计电路的阻尼特性加以改进，实现了方波信号高精度的可靠输出，满足技术指标要求。目前，该信号源已广泛应用于多项航天测试项目。

Design of multi-channel analog signal source based on FPGA

For the requirements of analog signal source in the field of aerospace test, we proposed a new method of signal source realization, which use software to generate the waveform data with real-time programming. According to the rational design of waveform reconstruction circuit, signal conditioning circuit and multi-channel circuit, the control logic of FPGA realized the waveform reconstruction and multi-channel output. Because of the particularity of square wave signal at the time of rising edge or falling edge, we designed specifically for the square wave generating circuit. After the experimental verification, the damping characteristic of the original design is improved, which have a reliable output and high precision, meeting the technical requirements. Currently, the signal source has been widely used in a number of aerospace tests.