由于杂散性能较差是DDS应用受限的主要原因，本文从理论和实际应用两个方面着重分析了实际参数DDS的输出频谱特性。
The bad spurious performance is the major problem that restricts the applications of DDS, so the theoretical and practical analysis attaches importance to the spectrum performance of DDS.
由于相位舍位会导致直接数字频率合成器(DDS)的输出产生杂散，使其频谱特性恶化。
As we know, spurious noise of a DDS resulted from phase truncation degrades its spectral characteristics.
为探讨三阶色散对脉冲传播的意义，用数值模拟的方法讨论了在色散缓变光纤中零色散波长附近三阶色散对脉冲频谱演变的影响。
Propagation of spectra affected by third-order dispersion in dispersion-decreasing fiber near zero dispersion wavelengths was studied by means of numerical simulation.
本文用傅里叶级数的方法分析了合成波形的频谱特性，并对由于相位截断引起的杂散谱作了讨论。
This paper analyzes the spectral characteristic of the synthesized waveform by use of the Fourier Series, and discusses the spurious spectrum of the phase truncation errors.
为了能有效的抑制DDS的杂散，讨论了DDS杂散的三个主要来源并分析了部分杂散对DDS输出频谱的影响。
For the effective suppression of DDS spur, the paper has discussed three main origins of DDS spur and analyzed influence of the spur to the DDS output frequency spectrum.
对给定的传输距离，随着光纤向零色散附近靠近，两个频谱区谱宽增加直到相互重叠。
For a given dispreading distance, the widths of the two spectrum regions increase until overlay when second-order dispersion approaches zero.
并对DDS输出的频谱杂散分布规律及抑制技术进行了比较详细的讨论。
Especially, the distribution and the restraint methods of the DDS spurs are discussed at length.
本课题的目的是设计一个适用于该频谱分析仪的宽频率范围、精细频率步进、低相噪及低杂散的合成扫频源。
The purpose of this project is to design a wide frequence band, fine frequency step, low phase noise and low spur synthesis sweeping source suited for the spectrum analyser.
本课题的目的是设计一个适用于该频谱分析仪的宽频率范围、精细频率步进、低相噪及低杂散的合成扫频源。
The purpose of this project is to design a wide frequence band, fine frequency step, low phase noise and low spur synthesis sweeping source suited for the spectrum analyser.
应用推荐