核磁共振（Nuclear Magnetic Resonance，NMR）射频脉冲发生器对成像质量至关重要. 传统的直接数字频率合成技术（Direct Digital Synthesizer，DDS）要想实现较高精度则需要依赖大容量查找表，因此会占用较多的片上随机块存储器（Block Random Access Memory，BRAM）资源且灵活度受限. 本文提出一种基于坐标旋转数字计算机（Coordinate Rotation Digital Computer，CORDIC）算法的磁共振射频脉冲发生器设计，通过在现场可编程门阵列（Field-Programmable Gate Array，FPGA）中构建自定义CORDIC核实现射频信号的频率、相位和幅度的数字化调制，结合Zynq-7000全可编程片上系统（System on Chip，SoC）实现高集成度、低功耗的硬件架构. 实验结果表明，所设计脉冲发生器可输出频率分辨率为0.046 Hz、相位分辨率为0.005 5˚的射频脉冲信号，且四通道所占用的BRAM资源较传统DDS方案降低约21.4%. 该设计为NMR设备的射频前端小型化与高性能化提供了可行方案.

The RF pulse generator in nuclear magnetic resonance (NMR) systems plays a crucial role in determining imaging quality. Traditional direct digital synthesis (DDS) techniques rely on large-capacity lookup tables to achieve high precision, which results in excessive consumption of on-chip block random access memory (BRAM) resources and limits flexibility. This paper proposes a design for a magnetic resonance radiofrequency pulse generator based on the coordinate rotation digital computer (CORDIC) algorithm. By implementing a custom CORDIC core within a field-programmable gate array (FPGA), it achieves digital modulation of the radiofrequency signal's frequency, phase and amplitude. Combined with a Zynq-7000 system-on-chip (SoC), this design provides a highly integrated and low-power hardware architecture. Experimental results demonstrate that the proposed pulse generator can output RF pulses with a frequency resolution of 0.046 Hz and a phase resolution of 0.005 5˚, Moreover, the BRAM resources occupied by the four channels are reduced by approximately 21.4% compared to the traditional DDS solution. This design offers a feasible solution for achieving miniaturization and high performance in the RF front-end of NMR instruments.