# Frequency Modulation Circuit Diagram Using Multisim

By | July 31, 2023

## Frequency Modulation Circuit Diagram Using Multisim

Frequency modulation (FM) is a modulation technique in which the frequency of a carrier wave is varied in proportion to the amplitude of the modulating signal. This is in contrast to amplitude modulation (AM), in which the amplitude of the carrier wave is varied in proportion to the modulating signal. FM is used in a variety of applications, including radio broadcasting, television broadcasting, and satellite communications. It is also used in some high-end audio equipment. In this article, we will create a frequency modulation circuit diagram using Multisim. We will then simulate the circuit and see how the output waveform changes as we vary the input signal. ### 1. Creating the Circuit Diagram The first step is to create the circuit diagram. The following is a simple FM circuit diagram: The circuit consists of a sine wave generator, a voltage-controlled oscillator (VCO), and a mixer. The sine wave generator generates the modulating signal, which is a sine wave with a frequency of 1 kHz. The VCO is used to generate the carrier wave, which is a sine wave with a frequency of 100 kHz. The mixer combines the modulating signal and the carrier wave to create the FM signal. ### 2. Simulating the Circuit Once the circuit diagram is created, we can simulate the circuit using Multisim. To do this, we first need to import the circuit diagram into Multisim. We can do this by clicking on the "File" menu and selecting "Open." Then, we need to select the ".mssim" file that contains the circuit diagram. Once the circuit diagram is imported, we can start simulating the circuit. To do this, we first need to set the input signal. We can do this by clicking on the "Simulate" menu and selecting "Set Waveform." Then, we need to select the "Sine" waveform and set the frequency to 1 kHz. We can now start the simulation by clicking on the "Simulate" menu and selecting "Start." The simulation will run for a specified number of seconds. Once the simulation is complete, we can view the output waveform. To do this, we need to click on the "Waveforms" tab. The output waveform will be displayed in the "Oscilloscope" window. The following is the output waveform of the FM circuit: As you can see, the output waveform is a sine wave with a frequency of 100 kHz. The frequency of the output waveform is modulated by the input signal. This is evident from the fact that the output waveform changes in frequency as the input signal changes in amplitude. ### 3. Conclusion In this article, we have created a frequency modulation circuit diagram using Multisim. We have then simulated the circuit and seen how the output waveform changes as we vary the input signal. FM is a versatile modulation technique that is used in a variety of applications. It is a good choice for applications where the signal is susceptible to noise, as FM is more resistant to noise than AM. ## Resources * [Frequency Modulation](https://en.wikipedia.org/wiki/Frequency_modulation) * [FM Circuit Diagram](https://www.electronics-tutorials.ws/rf/fm-circuit.html) * [FM Simulation](https://www.electronics-lab.com/fm-simulation/)

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