The disadvantages of DDS (direct digital frequency synthesizer) are rather low output frequency and a large set of the spurious signals, and one reason of the spurious signals is phase truncation.

• 摘要直接数字频率合成(DDS)的缺点在于输出频率低和存在大量的杂散信号，而杂散信号产生的原因之一就是相位截断。