基于FPGA的核磁共振数字化发射机  

A Digital Transmitter for NMR Based on FPGA

作　　者：陈楠[1] 陈杰华[1] 胡鹏[1] 刘朝阳[1] 高军毅[1] 

机构地区：[1]波谱与原子分子物理国家重点实验室(中国科学院武汉物理与数学研究所),湖北武汉430071

出　　处：《波谱学杂志》2008年第2期243-249,共7页Chinese Journal of Magnetic Resonance

基　　金：国家自然科学基金资助项目(10675162);科技支撑计划资助项目(2006BAK03A22)

摘　　要：提出了一种基于FPGA的核磁共振数字化正交发射机的设计技术.利用FPGA内嵌块RAM以及丰富的逻辑资源,并基于ARM7等嵌入式通讯系统完成发射机的高速调制,可以灵活地实现脉冲的频率、相位以及幅度等的调制,精确地控制脉冲的间隔时间.同时FP-GA对两片DDS芯片的同步控制还可以实现正交射频信号的发射.This paper presents an FPGA-based design scheme of NMR digital orthogonal transmitter. Utilizing embedded blocks such as RAM and the resources of logic gate of the FPGA and based on ARM7 and other communication systems, the realized transmitter is shown to be able to provide accurate high speed pulsed output with FM, PM or AM. Synchronously controlling two pieces of DDS using the FPGA, the transmitter is able to provide orthogonal RF output. In addition, both of the signals in orthogonal output can be regulated independently. This flexible design can be conveniently extended to the design of multi channel transmitter.

关 键 词：核磁共振 发射机 直接数字合成 FPGA 

分 类 号：O482.53[理学—固体物理]