相位舍位对DDS谱分布的影响

详细信息

Effect on Output Spectrum of DDS in Presence of Phase Truncation

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,这对实际的DDS系统设计有着极大的参考价值。
- 直接数字频率合成器 /
- 相位累加器 /
- 相位舍位 /
- 离散傅里叶变换 /
- 傅里叶变换
Abstract: 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.
- direct digital synthesizer /
- phase accumulator /
- phase truncation /
- discrete Fourier transform /
- Fourier transform