FM Receiver Block Diagram, Working Principle Understand Easily

Hey, we are going to know about the FM Receiver Block Diagram and Working Principle. FM means Frequency Modulation. The main function of an FM receiver circuit is to receive the radio signal and convert it into an audio signal. FM receiver circuits are mainly used in broadcast receiver stations. A good FM receiver circuit should be able to receive signals properly, with high bandwidth, very low noise, very low interferences, etc. Here, you will find the block diagram of FM Receiver which will help you to understand the working principle of FM Receiver.

FM Receiver Block Diagram

Here you can see a simple block diagram of FM Receiver.

FM Receiver Working Principle

To easily understand the working principle of FM Receiver, see the block diagram. The first block is the Antenna.

The antenna is used to receive the radio signals and intercept them. The next block is the Radio Frequency Amplifier or RF amplifier. The RF amplifier is used to amplify the RF signal received by the antenna. The received RF signal is very weak which is why it needs to amplify. The RF amplifier is also responsible for Noise-reducing, impedance matching, etc.

The next stage is the Mixer stage. The mixer circuit takes two signals as input, one is the amplified RF signal coming from the RF amplifier and another is an oscillating signal coming from the local oscillator. By combining those two signals, the mixer circuit generates the IF signal.

The IF amplifier circuit takes the IF signal or Intermediate Frequency signal coming from the Mixer Circuit and amplifies it.

The FM Demodulator Circuit is used to demodulate the FM signal. The FM demodulator circuit recovers the actual modulated signal which comes from the transmitter circuit in the form of the radio signal. The demodulator circuit gives a de-emphasizing signal as output.

After passing the de-emphasizing signal (which comes from the demodulator circuit) through the AF or Audio Frequency Voltage Amplifier we get the original audio signal that was sent from the sender station.

At last, the audio signal is fed to the power amplifier circuit to amplify it. Then the output of the power amplifier is applied to the speaker.

Remember that an FM Receiver Circuit only can receive the signal, it cannot transmit a signal. While receiving signals, frequency matching or frequency selection is a very important factor. There are so many signals of different frequencies available. However using the frequency selection process, a particular signal is extracted or received.



Read Also:

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• [BEST] Applications, Advantages of FM or Frequency Modulation
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• What is Time Switching or Time Division Switching? Explained

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