The design phase locked loop principle, by two overlapping basic circuit to achieve CD4046 FM modulation/demodulation circuit design, the modulation circuit output signal as an input signal demodulation circuit, and ultimately the modem signal. Principle of the voltage of the carrier signal we get is more than 3V, the maximum frequency deviation 5KHz, the output of the FM demodulation circuit voltage modulation signal is larger than 200mV can see that we comply with the design refers to the specific design

74hc4046.pdf

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