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How to increase the frequency deviation of FM demodulator?

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Frequency demodulator



Hi all,

i need help here! I am designing a FM demodulator of f0=5MHz, Fm=1KHz and Δf =10KHz using the IC of NE564. But i need to increase the frequency deviation (Δf),
How should i do to increase it? Can i change the capacitors for the loop filter (LPF) ?

the pdf mentions that i can use Δf 1% or higher of the input signal, but the most i can increase the Δf is only up to 15KHz, after that noise occurs.


Thanks!!!!!
 

Re: Frequency demodulator

This PLL circuit can be easily used to demodulate FM signal with deviations in the range of several MHz; no setup here.
Deviation has to be determined at the modulator end by adjusting the level of the signal that will be Frequency Modulated (kHz or MHz / Volt)..
 

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