核磁共振波谱仪接收机的设计与实现

摘要

介绍了液体高分辨率核磁共振波谱仪接收机的设计.接收机以PCI-104为控制器实现网络通信与采样流程控制,通过FPGA(Field Programmable Gate Array,现场可编程门阵列)实现数字中频接电路的控制和数据处理,简化了硬件结构;通过在接收机中引入脉冲序列生成器,产生接收机所需的采样控制信号,降低接收机与系统其他模块的耦合度.最后组成500 MHz核磁共振波谱仪实现核磁共振信号的检测.%The design and implementation of a high-resolution NMR spectrometer receiver was introduced. PCI-104 was used as the controller of the receiver and served to implement network communication and the other complicate control logic. FPGA was used to control IF receiver board and implement DSP. A special pulse sequence generator that generates acquisition control signal was built in FPGA to reduce coupling between the receiver and other module in the system. The receiver was integrated in a 500 MHz console.