Teaching

Debasis Das

Assistant Professor, Gr-I

Energy Efficient computing, Modeling and Simulation, Nanoelectronics, Neuromorphic computing, Spintronics

Subjects (Year wise)

2024 Fall Semester: RF Microelectronics

2025 Spring Semester: Microelectronics Circuits

2025 Fall Semester: Analog and Digital VLSI Design (ADVD)

2026 Spring Semester: Microelectronics Circuits

Simulation Videos for Teaching

A student doesn't truly understand a concept until they can visualize it in their mind's eye. While traditional lectures often rely on static equations, I try to bridge the gap between "knowing" and "grasping." For many students, complex theories can feel like a foreign language. My mission is to translate that language into dynamic, visual demonstrations that bring concepts to life. By transforming abstract data into interactive experiences, I ensure that no student is left behind by a lack of imagination.

A few samples of the visual effect I created using Python to explain the concepts in the class

3d Visualization of MOSFET I-V characteristics

We typically analyze the current-voltage characteristics by separately examining ID vs. VDS with VGS as a parameter and ID vs. VGS in saturation. However, ID is intricately dependent on both VDS and VGS.

To better visualize this complex relationship, I've developed Python code to represent ID as a colored surface in a 3D hyperspace.

Perspective 1: Projecting along the VGS axis reveals the familiar ID vs. VDS plot.

Perspective 2: Projecting from the VDS axis showcases the ID vs. VGS plot in saturation.

This 3D visualization provides a comprehensive understanding of ID's behavior.

Amplification process using MOSFET VTC

This video provides a dynamic visualization of the Linear MOSFET Signal Amplification process, illustrating how small input variations translate into larger, phase-inverted output signals.

Here are the key points covered in the demonstration:

Operating Regions: The visualization identifies the distinct regions of MOSFET operation, specifically highlighting the the three different regions, Cutoff, Saturation and Triode. We would be using the linear section of the saturation region of VTC.
Small-Signal Input: A small sinusoidal signal (red) is applied as the gate-to-source voltage ( $v_{GS}$ ), centered around a specific DC bias point.
Transfer Characteristics: The video maps the input $v_{GS}$ signal through the MOSFET’s linear section of the VTC to determine the resulting drain current behavior. The drain voltage signal is shown by the green color.
Signal Inversion and Amplification: You can observe the phase relationship between the input and the amplified output, where a positive swing in the gate voltage results in a corresponding (and inverted) swing in the output signal.
Linearity and Bias: The demonstration emphasizes how selecting an appropriate bias point within the steep, linear portion of the curve is critical for achieving undistorted amplification.

This visual approach aims to bridge the gap between abstract equations and physical circuit behavior, making the concept of signal gain more intuitive and accessible.

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Debasis Das

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Simulation Videos for Teaching

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