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我用LM567做锁相环电路，不加输入FSK信号时，5脚（方波信号）输出正常。当加了输入FSK信号后，5脚也变成两个频率的方波信号，并且输出（8脚）一直在抖动，不能输出稳定的解调信号。
我的电路原理图如下：
