基于改进CORDIC算法的DDFS设计  

Design of DDFS Based on Improved CORDIC Algorithm

作　　者：李丹[1] 刘林涛[2] 

机构地区：[1]同济大学电子与通信工程学院,上海201804 [2]中国电子科技集团公司第二十四研究所,重庆400060

出　　处：《微电子学》2014年第2期210-213,共4页Microelectronics

摘　　要：设计了一种基于改进CORDIC算法的直接数字式频率合成器(DDFS)。在CORDIC算法的基础上,采用角度重编码来进行迭代方向预测,避免了传统算法中迭代方向需要由剩余角度与输入角度反复比较的不足;运用少数比特迭代法,对迭代过程进行优化,减少了迭代次数,降低了传统CORDIC算法的运算量。Architecture of a direct digital frequency synthesizer（DDFS）based on improved coordinate rotation digital computer（CORDIC）was designed.In this circuit,angle recoding over CORDIC was adopted to obtain the direction of rotations,which eliminated the need for repetitive comparison between current and input angles at each stage in conventional algorithms.Also,minority-bit butterfly stages were employed to optimize the process of rotational butterfly stages,which reduced both the number of rotations and the amount of operations in traditional CORDIC algorithms.

关 键 词：直接数字式频率合成器 坐标旋转数字计算 角度重编码 少数比特迭代 

分 类 号：TN402[电子电信—微电子学与固体电子学]