讨论了两种误差对NCO杂散的影响，介绍采用相位抖动技术以提高无杂散动态范围，给出了仿真结果和实例。

This paper introduces phase dither technique to improve specification of SFDR, and analyzes two error influencing SFDR. It also shows the simulation result and the practice example.

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无杂散动态范围被定义为用dB表示的，接收机噪声和两个相等杂散信号的电平的差，这两个杂散信号的互调产物与接收机噪声相等。

It is defined as the difference in dB between receiver noise and the level of two equal spurious signals whose intermodulation products are equal to the receiver noise.

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