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我用5k倍频到9.995M通过分频器后的反馈信号居然与输入信号是反相的，为什么不是同相的?我用的是PC3相位比较器端口。附图中蓝色的是输入信号。
PC3相位比较输出的是与输入信号相位相反，而PC1和PC2的与输入相位是相同的。
