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介绍了分数分频锁相环产生分数调制的原因和进行相位补偿的复杂性，分析了小数位的数字分布对输出信号频谱纯度的影响，由此给出用脉冲调制方式改善输出信号质量的实现方案和理论分析。
This paper introduces the reason of Fractional Frequency Modulation PLL generating fractional modulation and the complexity of phase compensation. The influence of digital distribution of fractional bits on spectral purity of output signal is analyzed. The realization of output signal quality improvement by pulse modulation is given Schemes and theoretical analysis.