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我按下面的电路做一个相移电路并且倍4倍频给其他电路做参考,电路中用的是74系列的,我用的是CD4046,然后VCO输出频率就是3.8KHZ,排针输出的参考信号是950HZ,也是4倍频,不知道是电路的问题还是芯片不同的缘故,请TI的各位工程师帮个忙解决一下