小数分频锁相环的杂散分析

利用小数分频锁相环进行频率合成可以在不降低参考信号频率的前提下，提高输出信号频率分辨率，从而提高系统的频率转换速度。小数杂散是小数分频锁相频率合成中的主要问题，目前尚未见到对它进行的详细分析，详细分析了小数分频杂散产生的机理及它的影响，并提出了消除小数杂数的方法。

Stray Analysis on Fractional Frequency-division Phase Locked Loop

With the fractional frequency-division phase-locked loop to synthesize digital frequency, power of output signal frequency and the transformable speed of frequency will be improved on the condition that reference signal frequency is not decreased. Spurious outputs are the main problem in the digital frequency synthesizer with a fractional frequency-division phase-locked loop. It has never been analyzed in details. The essay analyzes the mechanism producing the digital spurious outputs and other effects in details and then puts forward a method to remove spurious outputs.