【摘要】 直接数字频率合成技术 (DDS)是近年来发展迅速的一种新的频率合成技术。全数字化的结构赋予了它很多的优点 :频率转换时间短、频率分辨率很高、输出相位连续、容易集成和易编程控制等 ,当然也就引进了数字化结构的缺点——输出杂散大。本文对DDS波形发生器中由于相位截尾所产生的杂散进行分析 ,并提出抑制相位截尾噪声的方法 ,给出了实现方法和实验结果。更多还原

【Abstract】 Direct digital synthesizer (DDS) is a new developed frequency-synthesizer technology. The all-digital structure of the technology gives itself many advantages, such as the very short frequency-transition time, the very high frequency resolution, the successive phase output under the frequency transition and its easier programmed character. At the same time the all-digital structure of the DDS brings its disadvantages: the high output noise. This paper analyzes the noise produced by the phase-truncation and put up a means by which we can restrain its high output noise.更多还原