基于CORDIC改进算法的NCO设计  

Design of NCO based on improved CORDIC algorithm

作　　者：王申卓 胡春林[1] 胡广垠 徐大诚[1] 

机构地区：[1]苏州大学电子信息学院,江苏苏州215000

出　　处：《电子技术应用》2017年第3期43-47,共5页Application of Electronic Technique

摘　　要：数控振荡器(NCO)已经被广泛应用于数字信号处理、软件无线电系统等诸多领域中。针对基于传统CORDIC(Coordinate Rotation Digital Computer)算法的NCO存在工作频率较低、精度不高、且消耗资源多等缺点,通过对CORDIC算法进一步优化改进,提出了一种NCO的设计方法,将覆盖角度扩展至整个圆周范围,实现了幅度与相位之间分别对应,且输出的正余弦波形具有完全正交性。实验结果表明,设计的NCO具有运算速度快,消耗硬件资源较少,结构简单易于使用硬件电路实现的优势,最高频率比基于传统CORDIC算法的NCO提高了114.3%,并将精度提高至10-5~10-6的数量级。Numerically Controlled Oscillator（NCO） has been widely applied in many fields ,including digital signal processing and software defined radio. NCO based on the conventional CORDIC has disadvantages of low operation frequency, low precision, and high consumption of resources. To solve these problems, a design of NCO is presented in this paper by improving the conventional CORDIC, the phase and amplitude of a one-to-one corespondence is realized, extends the convergence range to the entire circum- ference, and the sine and cosine waveforms are completely orthogonal. The simulation results showed that the design has advantages of high speed, low resource usage and simple structure, the maximum clock frequency is 114.3% higher than the NCO which is based on the traditional CORDIC algorithm, and the accuracy is improved to 10^-5-10^-6.

关 键 词：数控振荡器 CORDIC算法 精度 流水线 

分 类 号：TN402[电子电信—微电子学与固体电子学]