摘要
采用严格的信号分析方法，运用离散傅里叶变换（ＤＦＴ）和傅里叶变换（ＦＴ）详细推导了理想状态和相位舍位条件下直接数字频率合成器（ＤＤＳ）的频谱分布规律。所得到的理论推算结果与目前公认的结果一致。
Based on rigious signal analysis,some spectrum expressions of direct digital synthesizer (DDS) are presented by employing discrete Fourier transform (DFT) and Fourier transform (FT) in this paper.First,the output characteristics of DDS with ideal parameters are discussed.Then,the distribution and amplitude of output spectrum of DDS are provided in the presence of phase accumulator truncation in details.The deduced results are quite in agreement with general recognized ones.The conclusion is useful for real DDS System design.
出处
《电子科技大学学报》
EI
CAS
CSCD
北大核心
1997年第2期137-142,共6页
Journal of University of Electronic Science and Technology of China
关键词
数字频率合成器
相位累加器
相位舍位
direct digital synthesizer
phase accumulator
phase truncation
discrete Fourier transform
Fourier transform
