Topmusicanswers
- How does FM demodulator work?
- What does an FM detector do?
- What is a demodulator in radio waves?
- How PLL can be used as an FM demodulator?
How does FM demodulator work?
FM demodulation basics
In any radio that is designed to receive frequency modulated signals there is some form of FM demodulator or detector. This circuit takes in frequency modulated RF signals and takes the modulation from the signal to output only the modulation that had been applied at the transmitter.
What does an FM detector do?
It is a Tuned-circuit frequency demodulator type wherein it converts FM signals to AM using tuned (LC) circuits and extract the information from the AM envelope using a series connection of a diode and a capacitor (conventional peak detector.) It can be used with any radio even if it does not have an FM capability.
What is a demodulator in radio waves?
A demodulator is an electronic circuit (or computer program in a software-defined radio) that is used to recover the information content from the modulated carrier wave.
How PLL can be used as an FM demodulator?
To look at the operation of the PLL FM demodulator take the condition where no modulation is applied and the carrier is in the centre position of the pass-band the voltage on the tune line to the VCO is set to the mid position. However if the carrier deviates in frequency, the loop will try to keep the loop in lock.
