Quadrature FM Demodulation

380

03:14:14

*Veesion 1.5* Changing frequency will result in proportional change in Red current level.
Wait for a while for red line to be stable!!!!

The AND gate output is dependent upon the phase difference between the two signals, i.e. it acts as a phase detector and produces a voltage output that is proportional to the phase difference and hence to the level of deviation on the signal.

http://www.radio-electronics.com/info/rf-technology-design/fm-reception/fm-quadrature-detector-demodulator.php

With Better Modulation Index. Changing the frequency will increase or decrease the max peaks at the output of and gate.
Wait for a minute before you start :p
 Increase in frequency-> higher peaks
Decrease-> Lower peaks.
This way this demodulator can extract info from FM Signals to speaker recognizable format.

published 10 years ago

hurz

10 years ago

This seems to be in maximum a FM to AM transformation if any. The second mosfet gate is grounded. Thats why the second coil, which is not needed is in parallel to the tank curcuit. Anyway, its not much fun to have all these uOhm resistors. Just replace them if you like that anybody keeps commenting your circuits. Same giga gaga ohms :p

Ashish_kumar_4

10 years ago

Lol ok

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