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中文摘要：
基于Xilinx Spartan-3型FPGA芯片，设计了一套数字化电容层析成像数据采集系统。该系统由FP-GA构建片内DDS模块，与外部D／A配合，产生激励型号，嵌入于FPGA内部的MCU模块控制多路选通、调节PGA增益并与PC及通讯，FPGA硬线逻辑控制A／D采集并实现数字相敏解调。该系统具有结构灵活、测量精度高以及测量速度快等特点。
英文摘要：
A digital data acquisition system is designed and implemented based on Xilinx Spartan-3 FPGA （Field programmable gate arrays） chip. In this system, a DOS （Direct digital synthesizer） parameterized in FPGA, together with the external D/A chip and other circuits, produces excitation signals. An embedded M.CU is employed to control multiplexer, PGA gain and transfer data with host PC. High speed A/D and digital phase sensitive demodulator （PSD） are both implemented with hard wire logics. This system has flexible structure, high measurement precision and speed.
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