The phase truncation causes spurious signals at the output of the DDFS.
相位截断误差在合成器输出端形成寄生调制信号。
As we know, spurious noise of a DDS resulted from phase truncation degrades its spectral characteristics.
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。
The phase error signal due to the phase truncation is analyzed, and the regularity of its spectral lines is obtained.
对相位舍位误差信号作了分析，得到了其频谱分布的规律。
The spectrum characteristics of the phase truncation error and amplitude quantization error are analyzed by the method of Fourier series.
介绍了直接数字频率合成技术以及分析其杂散误差，对相位截断误差和幅度量化误差进行了傅立叶级数分析研究。
According to this method all the DDS output frequencies have no phase truncation noise, so the phase noise of the tuner local oscillator is greatly (improved.)
应用该方法可使其在所用频率点上无相位截断噪声，从而使调谐器本振的相位噪声大大改善。
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.
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 introduces the theory of the phase-locked loop (PLL) and the direct digital synthesis (DDS), a method to improve the precision of DDS and reduce its phase truncation error is also given.
介绍了锁相环(PLL)技术和直接数字式频率合成(DDS)技术的基本工作原理，给出了一种提高DDS输出频率精度及减小其相位截断误差的方法。
This paper introduces the theory of the phase-locked loop (PLL) and the direct digital synthesis (DDS), a method to improve the precision of DDS and reduce its phase truncation error is also given.
介绍了锁相环(PLL)技术和直接数字式频率合成(DDS)技术的基本工作原理，给出了一种提高DDS输出频率精度及减小其相位截断误差的方法。
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