一种抑制相位截断误差引起的杂散结构  

A Frame of Repressing the Spurious Caused by Phase Truncation Error

作　　者：王莹莹[1] 仇洪冰[1] 

机构地区：[1]桂林电子科技大学信息与通信学院,广西桂林541004

出　　处：《桂林电子科技大学学报》2009年第3期208-212,共5页Journal of Guilin University of Electronic Technology

摘　　要：为了减少DDS中相位截断误差引起的杂散,二阶噪声整形电路和Sunderland结构相结合的DDS结构可以将杂散能量从频谱的低频段搬移到高频段,然后通过高质量的低通滤波器,有效地滤除相位截断引起的杂散。仿真结果表明,采用这种结构的低频段杂散功率谱明显减少。In order to reduce the spurious caused by phase truncation error,a frame is introduced with combination of the second-order noise shaping circuit and the structure of Sunderland. The noise energy is transferred from low to high frequency band according to the noise shaping method. The spurious caused by phase truncation error can be filtered effectively by choosing a High-quality low-pass filter. The results of simulation proved that the power spectrum density is reduced.

关 键 词：直接数字频率合成器 杂散抑制 相位截断误差 杂散 噪声整形 Sunderland结构 

分 类 号：TN929.5[电子电信—通信与信息系统]