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介绍一种２５０ＭＳＰＳ数据采集存储卡及其与计算机接口电路的工作原理、设计思想，以及在雷达回波信号采集系统中的应用．系统采用了多路合成方案，以实现多路低速Ａ／Ｄ合成一路高速Ａ／Ｄ，从而减小了电路实现难度，提高了系统工作的可靠性．通过采用内存直接映射的接口方案，实现了采集扩展存储器在高速数据采集卡和计算机间的共享，从而完成高速采样数据向计算机的传输．最后从理论上对系统性能和调试结果进行了分析
This paper introduces a 250MSPS data acquisition memory card and its working principle with the computer interface circuit, design ideas, as well as radar echo signal acquisition system. The system adopts multi-channel synthesis scheme to realize high-speed A / D of multi-channel low-speed A / D synthesis, which reduces the difficulty of the circuit implementation and improves the reliability of system operation. By adopting the interface scheme of direct memory mapping, the sharing of the acquisition expansion memory between the high-speed data acquisition card and the computer is realized, so that the transmission of the high-speed sampling data to the computer is completed. Finally, the system performance and debugging results are analyzed theoretically