Draw block diagram of PLL as a FM demodulator. Explain function of each block.

Draw block diagram of PLL as a FM demodulator. Explain function of each block.
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1 Answer

Answer :

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Operation: 

The FM signal which is to be demodulated is applied at the input of the PLL. 

the PLL is locked to the FM 

The error voltage produced at the output of the amplifier is proportional to the deviation of the input frequency from the center frequency of FM. Thus, the at component of the error voltage represents the modulating signal. Thus at the error amplifies output we get demodulated 

The FM demodulator using PLL ensures a high Linearity, between the instantaneous input frequency and VCO control voltage (error amplifier output)

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