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VI characteristics of diode in matlab

VI characteristics of diode in matlab


Welcome to Learn MATLAB Basics. In this tutorial, we'll explore the forward bias configuration of a diode using MATLAB. By employing a controlled voltage source, we'll observe the current-voltage (IV) characteristics of the diode in the forward bias region.

Components Setup:

  1. Use of a controlled voltage source connected to a ramp input.

  2. Incorporation of a diode from the power electronics library.

  3. Current measurement setup using a current measurement block.

  4. Introduction of a series resistor (0.1 ohms) to simulate the practical behavior.

  5. Voltage measurement across the diode to monitor its behavior.

  6. XY graph setup to visualize the relationship between voltage and current.


  1. Connect the controlled voltage source to a ramp input simulating a variable power supply.

  2. Introduce a diode to observe its behavior in the forward bias configuration.

  3. Implement a series resistor to mimic real-world conditions.

  4. Set up current and voltage measurements for analysis.

  5. Utilize an XY graph to plot the diode's current-voltage characteristics.

Simulation Results:

  1. As the voltage ramps up, the diode initially remains non-conductive, and current is minimal.

  2. Upon reaching a certain voltage (forward voltage drop), the diode begins to conduct, and current increases.

  3. The graph illustrates the diode's exponential increase in current with increasing forward bias voltage.

  4. The reverse bias condition is also simulated, but due to minimal current, the variation is not as prominent.

Conclusion: This tutorial provides insights into the forward bias characteristics of a diode using MATLAB. By manipulating the input voltage, we observe the diode's behavior in terms of current flow. This practical demonstration aids in understanding the diode's functionality in electronic circuits.

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