What are the methods of FM demodulation?
What are the methods of FM demodulation?
There are different types of FM demodulators including:
- Slope Detector.
- Foster-Seeley Discriminator.
- Ratio Detector.
- Pulse-Averaging Discriminators.
- Quadrature Detectors.
- Phase-Locked Loops.
How do you demodulate an FM radio?
A simple and effective FM demodulation technique involves a high-pass filter (for FM-to-AM conversion) followed by an AM demodulator. A high-pass-filter-based FM demodulator is preceded by a limiter to prevent amplitude variations from contributing error to the demodulated signal.
Which of the following circuit is used for demodulation of FM?
The FM demodulator is done with the help of a circuit called Phase Locked Loop (PLL). A PLL should have basic functional blocks like Voltage Controlled Oscillator (VCO), Phase comparator, Low Pass Filter (LPF) and Source follower.
What are the requirements of FM demodulator?
The FM demodulator must satisfy the following requirements: (i) It must convert frequency variations into amplitude variations. (ii) This conversion must be linear and efficient. (iii) The demodulator circuit should be insensitive to amplitude changes. It should respond only to the frequency changes.
How does a demodulator work?
The synchronous AM demodulator uses a mixer or product detector with a local oscillator signal. The local oscillator signal is synchronised to the incoming signal carrier so that it produces no beat note with the incoming carrier. The sidebands of the AM signal are then demodulated to provide the required audio signal.
What is FM demodulation?
VARIOUS METHOD OF FM DEMODULATION Demodulation:-It is the process of deriving the original modulation signal from a modulated carrier wave. It is a detection technique of a received modulated signal. it is exactly opposite to that of frequency modulation.
What happens to the original modulating signal after demodulation?
After demodulation, we get the original modulating signal at the demodulation output. FM demodulator or detector is basically a frequency to amplitude converter. It is expected to convert the frequency variations in FM wave at its input into amplitude variations at its output to recover the original modulating signal.
What is the signal to noise ratio of FM demodulator?
The signal to noise ratio is comparatively very high at the output of FM demodulator circuits. However the FM modulator and demodulator circuits are complex compared to other modulation and demodulation techniques. The FM demodulator is done with the help of a circuit called Phase Locked Loop (PLL).
How does a PLL FM demodulator work?
The working of a PLL FM demodulator is very easy to understand.The input FM signal and the output of the VCO is applied to the phase detector circuit. The output of the phase detector is filtered using a low pass filter, the amplifier and then used for controlling the VCO.