基于FPGA和改进CORDIC算法的NCO设计与实现

Design and implementation of NCO based on FPGA and improved CORDIC algorithm

将CORDIC算法传统实现中的象限转换从输出转移到输入进行处理,简化了电路逻辑。针对CORDIC算法的流水线结构做出增大映射分区的改进,省去了流水线的第一级,减少了流水线结构内旋转角的一位数据宽度。在FPGA中仿真并实现了基于该改进CORDIC算法的NCO。仿真结果有良好的精度,证明了该方案的可行性。

Do the quadrant transformations of CORDIC algorithm with input data instead of output data used in the classical method and simplify the circuit. Meanwhile, improve the pipelined CORDIC algorithm by increasing it＇s mapping partitions, so it can discard the first stair of the pipeline series and a bit of the data about rotation angle in the pipeline structure. Simulate and implement the NCO based on FPGA and the improved CORDIC algorithm. It proves the feasibility of the scheme with the precision simulation results.