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用CD4046组成的频率信号跟踪电路

在网上看到的资料,关于cd4046做信号频率跟踪,其原理如图1中所示。按照该参考用tina仿真时发现根本实现不了频率跟踪,而且原图上好像没有标注哪个是输出,正确的电路应该是怎样的,请各位专家帮忙解答下,谢谢。

cd4046.TSC