基于CORDIC改进算法的DDS实现方法

Implementation of DDS Based on Improved CORDIC Algorithm

为克服传统CORDIC算法象限判断占用有效位数的缺点和只能在0,2内旋转的问题,提出了一种基于CORDIC改进算法的直接数字频率合成实现方法,可直接通过旋转实现0,2内的函数值.仿真结果表明:在相同的相位寄存器条件下,CORDIC改进算法输出信号频率分辨率是CORDIC算法的4倍,旁瓣抑制提高4.905dB.该算法可应用于高精度、高分辨率的设备.

In order to get over the problems of quadrant judgement occupying effective digits and rotating only in [0,π/2] in the conventional CORDIC algorithm,an implementation of DDS based on the improved CORDIC algorithm was put forward,by which the function value can be obtained from 0 to 2π directly through rotation.Simulations show that the resolution of output signal frequency by the CORDIC improved algorithm is four times of that by CORDIC algorithm and the side-lobe suppression is increased by 4.905 dB under the circumstances of the same phase registers.The improved algorithm can be applied to equipment with high precision and resolution.