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Modulation/demodulation with mixers

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STOIKOV

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in a mixer, if a sinusoid is applied to RF port, I suppose the modulation/demodulation is AM.
How is an FM or digital modulation/demodulation performed in a mixer ?
 

If you have two mixers, you can make an IQ demodulator and feed that into your baseband chip for digital demodulation.
 

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    STOIKOV

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Your RF is actually = Mod +RF. So when you go thru a mixer you get
(RF+Mod) - LO. And LO ~= RF . So your IF ~= Mod Signal. This is a simple case
where it's true if this where a Direct Conversion System.

Just remember that the IF output of the mixer will spit out what ever LOW
Freq Modulation that was Summed on the RF Carrier.
 

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    STOIKOV

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In AM modulation the modulator is a multiplier i.e. a mixer.
In digital modulation the mixer is just a part of the whole modulator/demodulator.
In FM modulation the modulator is basically a VCO, so if you send an FM signal to a mixer you have just upconversion or downconversion.


Bye
 

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    STOIKOV

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