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我10M赫兹经2000分频产生5K赫兹的信号后用CD74HC4046来对5K赫兹的频率进行锁相倍频产成9.995M赫兹的频率,我选用的是PC3口来作为相位比较端口滤波电路电阻为6.2M电容100P。而实际做出来的电路9.995M的频率频率不稳定(如附件图)。问下大家这是什么原因?谢谢大家!