一种基于CORDIC的磁共振射频脉冲发生器设计OA

In nuclear magnetic resonance(NMR)systems,the radio frequency(RF)pulse generator critically influences 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 study presents a novel RF pulse generator design based on the coordinate rotation digital computer(CORDIC)algorithm.By integrating a custom CORDIC core within a field-programmable gate array(FPGA),the proposed system achieves digital modulation of RF signal's frequency,phase,and amplitude.Combined with a Zynq-7000 system-on-chip(SoC),this design delivers a highly integrated and low-power hardware architecture.Experimental results demonstrate that the generator can output RF pulses with a frequency resolution of 0.046 Hz and a phase resolution of 0.005 5˚,while reducing BRAM resources occupied by four channels 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.