MOSFETs Explained (Part 1): Physics, Threshold Voltage & I-V Curves
Video description
In this new playlist, we’re starting from the ground up to understand MOSFETs—not just the symbols, but the physics behind how they work.
In Part 1, you’ll learn:
Why a MOSFET behaves like a capacitor (the MOS structure)
How the electric field creates an inversion channel
What threshold voltage (VTH) really means and what affects it
How VGS controls channel formation and drain current
How VDS shapes MOSFET operation (linear/triode vs saturation)
A clear introduction to MOSFET I-V characteristics and what the curves are telling you
By the end of this video, you’ll be able to look at MOSFET graphs and immediately understand:
when the device is OFF, when it starts conducting, and how it transitions across operating regions.
📌 Next in the playlist: we’ll move into region-by-region equations, small-signal concepts, and practical circuit examples.