中文摘要：

在航空航天电子测试中,直流信号源精度对测试结果具有重要影响,为提高直流信号源精度,提出了一种基于FPGA和AD768的精密可程控直流信号源实现方案;该方案通过USB2.0接口芯片接收计算机发送的信号源控制命令,以FPGA逻辑控制DAC的方式实现信号源的可程控设计,重点介绍了AD768的硬件电路设计,并从电路板设计和软件修正两个方面进一步讨论了提高信号源精度的关键技术;实际应用表明,该信号源具有高精度、可程控和稳定性好等优点,具有很高的参考价值.

英文摘要：

In the aerospace electronic test, the DC signal source has an important influence on the accuracy of the test results, a proposal on precise and programmable DC signal source based on FPGA and AD768 is proposed to improve the accuracy of the DC source. The proposal uses FPGA as control core, receiving the programmable command from computer via USB2.0 interface chip and controlling DAC voltage conversion circuit to make DC voltage output true. The hardware of AD768 is focused on, and the approaches of improving the precision of signal source are further discussed from circuit board design and software correcting. The actual application shows that the signal source has a high reference value with the advantages of high precision, programmable features and good stability.