Because of the better spur control than DDS, the Phase Locked Loop (PLL) frequency synthesis is usually used in frequency agile synthesis.
锁相频率合成（PLL）具有比DDS更优秀的杂散抑制能力，常用于捷变频率合成。Finally, the concept of the effective emissivity is introduced, and the system performance is evaluated.
最后，引入有效发射率的概念，对优化前后系统杂散辐射性能进行了评价。Spurious microvolt level signals are often present in low resistance circuits, most often as a result of thermoelectric effects.
在低阻电路上往往会出现毫伏级的杂散信号，大多数是由于热电效应引起的。It has been revealed that the stray capacitance between coil and shield case has large effect on the rise time of the coil.
在测量高频电流时线圈与屏蔽盒之间的杂散电容对上升时间有较大的影响。We analyze the main advantages and disadvantages of these architectures, which mainly focus on the phase noise and spurs.
从相位噪声和杂散的角度分析了这些频率合成方案的优缺点。Causes of the stray current corrosion in inlet and outlet of the electrolytic bath were analyzed to put forward a solution.
分析了电解槽进出口系统各主要设备杂散电流产生原因，提出了针对性的解决方案。The main parts of the spurious signal contain: the error of phase calculation, extent error and nonlinearity of DAC.
得到杂散信号的主要来源为：相位累加误差、幅度量化误差及数模转换器件（DAC）的非线性误差。The paper introduced the working principle of the direct digital frequency synthesizer(DDS) and its spurious analysis is performed.
文章介绍了直接数字频率合成器（DDS）的基本工作原理，同时对其杂散进行了分析。These parasites effect can significantly affect converter behavior, especially for large number of secondary turns.
这些杂散的效应将会改转换器的性能，尤其是当变压器二次侧为高圈数。