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how this FM modulator works? (Read 2162 times)
sapphire
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how this FM modulator works?
Jan 20th, 2009, 12:55pm  
I am not sure whether this circuit can work as a FM modulator, because the modulation point and the output are the same.

Anyone has seen this before? Thanks for your help

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didac
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There's a million
ways to see the
things in life

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manresa,spain
Re: how this FM modulator works?
Reply #1 - Jan 21st, 2009, 2:23am  
Hi,
It looks like a direct FM modulator. If Vin(t) is the information signal and Cdiode(that i's a varactor I assume) and L are the tank of an oscillator, the amplitude of V(t) is changing the ressonant frequency with time so its changing the carrier frequency, thus directly making an AM to FM conversion.
Hope it helps,
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