AM and FM Radio Block Diagram

Discover AM and FM technology's noise immunity and sound quality differences, and appreciate the delicate dance of electronics that brings the world to your ears.


Have you ever been puzzled about how your favourite song or recent news might appear out of thin air on a pocket-sized radio? Or why is the music on your car radio so loud even while speeding down the highway? The fascinating realm of AM/FM receivers, clever devices that translate invisible radio waves into the sounds we love, holds the key to the solution.

This article helps you understand these electronic marvels, uncovering their secrets one block at a time. We'll remove the layers and clarify the important components and processes enabling broadcasting to work magic on your ears.

Grab your curiosity, and get ready to discover the fascinating world of AM/FM receivers!

In this article
  1. All About Function Generators
  2. FM Receiver vs. AM Receiver: Distinctive Characters!
  3. How to Make Such Block Diagrams?
  4. Conclusion

Part 1. All About Function Generators

Function generators are useful electronic instruments that produce various waveforms for various applications. These flexible instruments give exact control over frequency and shape, making them fixtures in labs and workshops. Here are some of their primary capabilities:

Image Name: function-ganarator

Alt-text: function generator detailed diagram

Waveform Generation

Function generators excel at producing waveforms such as sine, triangle, square, and sawtooth. Each waveform has a distinct purpose, catering to various applications.

Square waves are used in logic circuits and timing applications, whereas sine waves are perfect for audio testing and signal analysis. With their linear slopes, triangular and sawtooth waves are ideal for driving sweep oscillators and X-Y recorders.

Dual Outputs

Many function generators boast the capacity to generate two distinct waveforms from different sources at the same time. This opens up possibilities for more complex applications, such as supplying a square wave for linearity measurements and a sawtooth for visual display on an oscilloscope.

Phase Locking

Advanced function generators can synchronize with external signals with their phase-locking features. This allows applications like phase-shifting two outputs by a specified amount or producing complicated waveforms by accumulating harmonics from various generators.

Furthermore, phase-locking to a stable frequency standard ensures that all generated waveforms are accurate and consistent.

How Do Function Generators Work?

A function generator's functionality can be understood using its block diagram. The integrator is the central component, where the current determines the output voltage slope and, as a result, the frequency.

The integrator is fed by two current sources, one giving constant current for growing voltage and the other for lowering voltage. The integrator output is monitored by a voltage comparator multivibrator, which switches between current sources at specified voltage levels, resulting in the characteristic triangle waveform.

The comparator output generates a square wave of the same frequency. Finally, with little distortion, a resistance-diode network refines the triangle wave into a sine wave.

Applications and Significance

Function generators are essential in various domains, including:

  • Electronics Testing and Development: They generate test signals to analyze circuits, test audio equipment, and develop electronic components.
  • Education and research: They are excellent instruments in educational labs for students to learn about waveforms and their applications. Researchers use them to generate specific signals needed in experiments.
  • Industrial Applications: Function generators are used in industrial settings to regulate processes, generate signals for communication systems, and test production equipment.

Part 2. FM Receiver vs. AM Receiver: Distinctive Characters!

FM receivers and AM receivers are two radio industry titans. Both capture and convert radio waves into audible sounds in fundamentally different ways, resulting in unique advantages and disadvantages. Let's look at their distinctive characteristics:

Modulation Methods

The primary distinction is how the radio signal, known as the carrier wave, is adjusted to carry audio information.

  • AM (Amplitude Modulation) Receiver: The amplitude (strength) of the carrier wave is altered in response to the audio stream. While easier to deploy, AM is prone to noise and interference, resulting in static and crackling.
  • FM (Frequency Modulation) Receiver: FM adjusts the carrier wave frequency to reflect the audio signal instead of amplitude. This method resists noise and interference, resulting in clearer, static-free reception.

Sound Quality

  • AM Receiver: The sound quality of AM is compromised by its noise sensitivity. Higher frequencies, essential for clear music, are easily lost, resulting in a muddled, bass-heavy listening experience.
  • FM Receiver: FM excels in sound quality due to its higher noise immunity. Higher frequencies are maintained, resulting in a more accurate, richer, and clearer reproduction of the original audio.

Transmission Range

  • AM Receiver: Because of its lower frequency band, AM has a greater transmission range. This makes it excellent for rural places with little signal strength.
  • FM Receiver: FM has a lower broadcast range because it operates at higher frequencies. However, its immunity to interference makes it more reliable in urban areas with many competing signals.

Station Availability

  • AM Receiver: AM receiver has a broader selection of stations, including talk radio, newscasts, and sports programming.
  • FM Receiver: Primarily focused on music, FM receiver stations cater to a wide range of genres and a wider audience.

FM Receiver Block Diagram: Composition Details!

Drawing block diagram for am fm receiver

An FM receiver converts the inaudible world of radio waves into audible melodies and voices. Understanding its inner workings necessitates interpreting its complicated composition's block diagram, a road map.


  • Antenna: The trip begins with the modest antenna, which captures the feeble FM signals in the air.
  • RF Amplifier: The RF amplifier acts as a cheerleader for the weak signal, boosting its strength and preparing it for further processing.
  • Tuner and Mixer: This powerful combination is a gatekeeper and translator. The tuner chooses the desired radio station frequency, mixed with a locally generated signal to produce an intermediate frequency (IF) signal.
  • IF Amplifier: Even though the IF signal is stronger, it requires additional amplification to be comprehended. The IF amplifier handles this, ensuring a strong signal for the next stage.
  • FM Demodulator: Now for the fun part! The FM demodulator removes the original audio information from the IF signal, peeling away the layers of frequency modulation.
  • Audio Amplifier: The amplified audio signal will rock your world. The audio amplifier converts this whisper into a roaring sound that powers your speakers or headphones.

AM Receiver Block Diagram: Composition Details!

While FM has improved sound quality, the straightforward, powerful, and far-reaching charm of AM nevertheless holds its own. Uncovering its secrets via the block diagram exposes an intriguing path from faint radio waves to your ears.


  • Antenna: The antenna detects weak AM radio waves in the air.
  • RF Amplifier & Tuner: This stage amplifies the weak signal and tunes it to the selected radio station by filtering out extraneous frequencies.
  • Intermediate Frequency (IF) Amplifier: The tuned signal is amplified and transformed to a lower, more controllable intermediate frequency (IF).
  • AM Demodulator: The demodulator recovers audio information from the amplitude changes of the AM signal. Consider deciphering Morse code with different light intensities.
  • Audio Amplifier & Filter: The still-weak recovered audio signal is amplified to drive your speakers. A filter removes any remaining noise or interference.
  • Automatic Gain Control (AGC): Unlike FM, AM is susceptible to fluctuations in signal intensity. The AGC compensates for these oscillations, ensuring the listening volume remains constant.

Part 3. How to Make Such Block Diagrams?

To draw such a diagram, follow any of the methods below: 

Method 1: Starting from Scratch

Step 1: Download, install, and launch EdrawMax on your computer to unlock the creative world.

[Add download button]

Step 2: Start with Blank Drawing to draw the Addams family tree from scratch from the home page.

Step 3: Draw and label the shapes and scatter them on the canvas to represent the flow of the process. 

Step 4: Join the shapes together using the Connector feature in the tool.

Connecting shapes for receiver diagram in EdrawMax

Step 5: Once done, customize the drawing by changing shapes, colors, and formatting for the text.

Method 2: Starting with a Template

Step 1: Download, install, and launch EdrawMax on your computer.

[Add Download Button]

Step 2: From the Home page, click Templates and search for the AM/FM receiver diagram template; choose the one you desire to customize and start editing.

Step 3: Customize the diagram by changing the colors, connector style, and text formatting.

EdrawMax template customization


This article has shown the intriguing world of AM/FM receivers, which convert invisible radio waves into songs, news, and conversations that enrich our lives. We've explored the fundamental features, figured out the complexities of block diagrams, and seen firsthand how these marvels of technology transform the murmurs of the air into audio enchantment.

Always remember that AM/FM receivers are more than just parts of a car radio or stereo; they are gateways to an enormous information and entertainment network that allows us to connect to diverse cultures and far-off voices.

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Edraw Team
Edraw Team May 23, 24
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