两种基于直接数字合成技术的阻抗激励源的对比研究  

Comparative study of two types of exciting sources based on DDS technol ogy

作　　者：刘延勇[1] 董秀珍[1] 尤富生[1] 史学涛[1] 季振宇[1] 

机构地区：[1]第四军医大学生物医学工程系医学电子工程教研室,陕西西安710033

出　　处：《第四军医大学学报》2005年第17期1618-1620,共3页Journal of the Fourth Military Medical University

基　　金：军队"十五"青年基金(01Q116)

摘　　要：目的:比较两种基于直接数字合成技术的阻抗激励源的性能,为以后阻抗系统设计提供指导.方法:设计了基于直接数字合成(DDS)芯片的阻抗激励源;并且在频谱特性、灵活性等方面与基于可编程逻辑器件(FPGA)芯片的激励源进行了比较.结果:在频谱特性上,FPGA激励源的信号质量优于DDS芯片激励源.灵活性上,DDS芯片激励源优于FPGA激励源.结论:二者各有优缺点,实际应用中,可根据具体情况选择合适的激励源.我们在实验中对激励源的灵活性要求较高,所以选择了基于AD9850的阻抗激励源.AIM： To compare the performance of two exciting sources based on direct digital synthesis （DDS） technology and to present some advice for the future system design. METHODS： The exciting source based on DDS chip was designed and was compared with the exciting source based on field programmable gape array （FPGA） chip on the spectrum performance and flexibility. RESULTS. In spectrum performance, there were fewer and smaller stray signals in the FPGA exciting source than that in the exciting source based on DDS chip. In regarding flexibility, the exciting source based on DDS chip was superior. CONCLUSION： The two types of exciting sources have their own advantages and choice should be made by need. As our experiment needs high flexibility, we have chosen the exciting source based on DDS chip.

关 键 词：直接数字合成 激励源 生物电阻抗 

分 类 号：R318.06[医药卫生—生物医学工程]