中文摘要：

目的：为生物电阻抗成像设备设计出一个高精度、高速率，并能进行同步采集的多路信号采集模块。方法：通过在FPGA上定制一个NiosII软核来作为系统的微控制器，然后通过对FPGA编程实现对多路A／D并行采集的时序控制，最后通过UART总线实现采集板与上位机之间的数据传输。结果：该系统成功地实现了对4路A／D转换器的并行控制，并实现了在100Hz～100kHz激励下对64路信号进行同步采集及初步的处理。结论：该设计方案达到了研究目的，能够满足EIS成像系统的数据采集需求。

英文摘要：

Objective To design a multi-channel data acquisition module with high quality and high speed, which can achieve synchronous acquisition for bioelectrical impedance imaging equipment. Methods A Nios II soft-core CPU was customized as the micro-controller of the system by FPGA, then FPGA was coded to achieve the timing control of multi- channel A/D. Finally, UART was used to achieve the data transmission between signal acquisition board and upper computer. Results The system actualized parallel control of 4-channel A/D convertors and the collection and processing of 64-channel singals when the excitation source＇s frequency was between 100 Hz and 100 kHz. Conclusion The design can meet the demand of data acquisition in EIS. [Chinese Medical Equipment Journal, 2014,35 （2） ： 1-3,7]